Ceramics International最新文献_第5页

High selectivity and efficient microwave-assisted reflux tin oxide synthesis controlled by acidity environments and its photocatalytic degradation toward Acid Yellow 17

IF 5.1 2区材料科学 Q1 MATERIALS SCIENCE, CERAMICS

Ceramics International

Pub Date : 2025-03-01 DOI: 10.1016/j.ceramint.2024.12.401

Kartini Noor Hafni , Meidina Zulfa Hanie , Juli Novita Sari , Reisya Ichwani , Noor Haida Mohd Kaus , Richa Fionasari , Kayla Aurora Alifia , Farqad Hanafi , Adri Huda

A series of tin oxide materials have been successfully synthesized under low-temperature synthesis using microwave-assisted reflux method in different acid synthesis environments. The result found that the initial synthesis environment differentiates the hydrolysis pathway and further stimulates the formation of a specific tin oxide product. At pH 2, tin (IV) oxide is mostly formed where the higher pH transforms tin (IV) to the combination of tin (IV) and tin (II) and finally tin (II) oxide. The phase transformations are confirmed by the X-ray diffractometer (XRD), Scanning Electron Microscope (SEM), and UV–Vis Diffuse Reflectance Spectroscopy (DRS) Spectrophotometer. The material performance test as the photo-catalyst confirms the activity of tin oxide prepared at pH 3 corresponding to Sn₃O₄ indicates as performs the highest photo-catalytic degradation followed by SnO₂ prepared at pH 2 and the mixture of Sn₃O₄ and SnO at pH 4, pH 5, and finally SnO at pH 6. The optimum activity of tin oxide could degrade above 90 % of acid yellow 17 (AY17) synthetic dyes under 60 min of light irradiation where further radiation could degrade the dye up to 98 %. However, the single phase of SnO did not show good photocatalytic performance due to its narrow bandgap. The pseudo-first-order kinetic models fit the observed photocatalytic degradation where tin oxide prepared at pH 3 has 0.0462 min⁻¹ of kinetic rate. From the synthesis point of view, the result found that microwave-assisted reflux cut the long period of synthesis route of tin oxide and opened the possibilities of pilot-scale synthesis of tin oxide for downstreaming tin industries controlled by an initial acid synthesis environment. In the photocatalytic performance, several materials are promising for wastewater treatment since they possess high photocatalytic performance and provide high photo-response on a visible light wavelength which potentially utilizes sunlight energy. Furthermore, the correlation between the synthesis route and its photocatalytic performance is well discussed in the present paper.

{"title":"High selectivity and efficient microwave-assisted reflux tin oxide synthesis controlled by acidity environments and its photocatalytic degradation toward Acid Yellow 17","authors":"Kartini Noor Hafni , Meidina Zulfa Hanie , Juli Novita Sari , Reisya Ichwani , Noor Haida Mohd Kaus , Richa Fionasari , Kayla Aurora Alifia , Farqad Hanafi , Adri Huda","doi":"10.1016/j.ceramint.2024.12.401","DOIUrl":"10.1016/j.ceramint.2024.12.401","url":null,"abstract":"<div><div>A series of tin oxide materials have been successfully synthesized under low-temperature synthesis using microwave-assisted reflux method in different acid synthesis environments. The result found that the initial synthesis environment differentiates the hydrolysis pathway and further stimulates the formation of a specific tin oxide product. At pH 2, tin (IV) oxide is mostly formed where the higher pH transforms tin (IV) to the combination of tin (IV) and tin (II) and finally tin (II) oxide. The phase transformations are confirmed by the X-ray diffractometer (XRD), Scanning Electron Microscope (SEM), and UV–Vis Diffuse Reflectance Spectroscopy (DRS) Spectrophotometer. The material performance test as the photo-catalyst confirms the activity of tin oxide prepared at pH 3 corresponding to Sn3O4 indicates as performs the highest photo-catalytic degradation followed by SnO2 prepared at pH 2 and the mixture of Sn3O4 and SnO at pH 4, pH 5, and finally SnO at pH 6. The optimum activity of tin oxide could degrade above 90 % of acid yellow 17 (AY17) synthetic dyes under 60 min of light irradiation where further radiation could degrade the dye up to 98 %. However, the single phase of SnO did not show good photocatalytic performance due to its narrow bandgap. The pseudo-first-order kinetic models fit the observed photocatalytic degradation where tin oxide prepared at pH 3 has 0.0462 min−1 of kinetic rate. From the synthesis point of view, the result found that microwave-assisted reflux cut the long period of synthesis route of tin oxide and opened the possibilities of pilot-scale synthesis of tin oxide for downstreaming tin industries controlled by an initial acid synthesis environment. In the photocatalytic performance, several materials are promising for wastewater treatment since they possess high photocatalytic performance and provide high photo-response on a visible light wavelength which potentially utilizes sunlight energy. Furthermore, the correlation between the synthesis route and its photocatalytic performance is well discussed in the present paper.</div></div>","PeriodicalId":267,"journal":{"name":"Ceramics International","volume":"51 8","pages":"Pages 9706-9712"},"PeriodicalIF":5.1,"publicationDate":"2025-03-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143593842","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Effect of solid solution of magnesia-alumina spinel on the microstructure and mechanical properties of CAC-bonded corundum castables

IF 5.1 2区材料科学 Q1 MATERIALS SCIENCE, CERAMICS

Ceramics International

Pub Date : 2025-03-01 DOI: 10.1016/j.ceramint.2024.12.410

Yaning Zhao , Zhongzhuang Zhang , Qiqi Hou , Jinyan Zeng , Yuandong Mu , Jian He , Guotian Ye , Jiajia Tian

Magnesia-alumina spinel undergoes a solid solution reaction during firing, which potentially impact the microstructure as well as the mechanical properties of the CAC-bonded corundum castables. Moreover, spinels possessing the same chemical composition yet produced via different methods may exhibit diverse solid solution behaviors. Consequently, this study firstly compares the solid solution behaviors of sintered and fused spinel powders, both of which have an identical alumina content of 72 wt%, and then investigates the effect of solid solution on the microstructure and mechanical properties of CAC-bonded corundum castables. The results indicate that both sintered and fused spinel powders experience solid solution reactions during the firing process, leading to the formation of spinel-calcium hexaluminate (CA₆) connection structures. This transformation alters the fracture behavior from intergranular to transgranular mode, thereby enhancing the mechanical properties of castables. When the spinel content is 10 wt%, the cold crushing strength of the castables containing sintered spinel reaches 235.9 MPa, which is 28.6 % higher than that of the castables without spinel. The spinel-CA₆ connection structures increase with the elevation of the spinel content. Additionally, due to its smaller grain size, sintered spinel undergoes higher degree of solid solution reaction, forming tighter connection structures, which contributes to the improvement of the overall mechanical properties.

{"title":"Effect of solid solution of magnesia-alumina spinel on the microstructure and mechanical properties of CAC-bonded corundum castables","authors":"Yaning Zhao , Zhongzhuang Zhang , Qiqi Hou , Jinyan Zeng , Yuandong Mu , Jian He , Guotian Ye , Jiajia Tian","doi":"10.1016/j.ceramint.2024.12.410","DOIUrl":"10.1016/j.ceramint.2024.12.410","url":null,"abstract":"<div><div>Magnesia-alumina spinel undergoes a solid solution reaction during firing, which potentially impact the microstructure as well as the mechanical properties of the CAC-bonded corundum castables. Moreover, spinels possessing the same chemical composition yet produced via different methods may exhibit diverse solid solution behaviors. Consequently, this study firstly compares the solid solution behaviors of sintered and fused spinel powders, both of which have an identical alumina content of 72 wt%, and then investigates the effect of solid solution on the microstructure and mechanical properties of CAC-bonded corundum castables. The results indicate that both sintered and fused spinel powders experience solid solution reactions during the firing process, leading to the formation of spinel-calcium hexaluminate (CA6) connection structures. This transformation alters the fracture behavior from intergranular to transgranular mode, thereby enhancing the mechanical properties of castables. When the spinel content is 10 wt%, the cold crushing strength of the castables containing sintered spinel reaches 235.9 MPa, which is 28.6 % higher than that of the castables without spinel. The spinel-CA6 connection structures increase with the elevation of the spinel content. Additionally, due to its smaller grain size, sintered spinel undergoes higher degree of solid solution reaction, forming tighter connection structures, which contributes to the improvement of the overall mechanical properties.</div></div>","PeriodicalId":267,"journal":{"name":"Ceramics International","volume":"51 8","pages":"Pages 9791-9799"},"PeriodicalIF":5.1,"publicationDate":"2025-03-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143593846","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Achieving ultra-low phase transition electric field and high dielectric constant in PbZrO3-based antiferroelectric ceramics by component modulation

IF 5.1 2区材料科学 Q1 MATERIALS SCIENCE, CERAMICS

Ceramics International

Pub Date : 2025-03-01 DOI: 10.1016/j.ceramint.2024.12.466

Hang Chen , A. Peláiz-Barranco , Huayang Zhu , Jianbin Tang , Tongqing Yang

Ceramic dielectric materials are widely used in the production of multilayer ceramic capacitors (MLCCs). Among these materials, antiferroelectric (AFE) materials play a crucial role in dielectric energy storage capacitors. However, achieving high energy storage density typically requires high voltages or large electric fields, which limits their use in civilian applications. To broaden the application of AFE materials at low electric field, such as integrated circuits and power electronics, it is essential to decrease the phase transition electric field of antiferroelectric to ferroelectric (E_A-F) and increase saturation polarization. In this study, (Pb_0.88Ba_0.09La_0.02)(Z_r0.6-xSn_0.4Ti_x)O₃(PBLZST) was synthesized using the traditional solid-state reaction method. By increasing the Ti⁴⁺ content, the E_A-F was successfully decreased while simultaneously both saturation polarization and dielectric constant were enhanced. Notably, the (Pb_0.88Ba_0.09La_0.02)(Zr_0.48Sn_0.4Ti_0.12)O₃ (T12) antiferroelectric ceramic achieved the lowest known E_A-F = 0.72 kV/mm, along with a high saturation polarization of 43.62 μC/cm². To better characterize the material's performance at low electric fields, a figure of merit u = P_max/E_b was designed to characterize the ability to store charge, and a larger value of u indicated the advantage of the material in achieving higher saturation polarization under its maximum tolerable electric field. The T12 antiferroelectric ceramic exhibited u = 0.58 under its breakdown strength, outperforming most reported AFE ceramics. Additionally, the T12 ceramic demonstrated a high dielectric constant of 4543 at room temperature, and its P-E hysteresis loop displayed excellent frequency stability (1–100 Hz) and fatigue resistance (>20,000 cycles) at an applied field of 1 kV/mm. These results indicate that (Pb_0.88Ba_0.09La_0.02)(Zr_0.48Sn_0.4Ti_0.12)O₃ antiferroelectric ceramics are promising candidates for civilian applications.

{"title":"Achieving ultra-low phase transition electric field and high dielectric constant in PbZrO3-based antiferroelectric ceramics by component modulation","authors":"Hang Chen , A. Peláiz-Barranco , Huayang Zhu , Jianbin Tang , Tongqing Yang","doi":"10.1016/j.ceramint.2024.12.466","DOIUrl":"10.1016/j.ceramint.2024.12.466","url":null,"abstract":"<div><div>Ceramic dielectric materials are widely used in the production of multilayer ceramic capacitors (MLCCs). Among these materials, antiferroelectric (AFE) materials play a crucial role in dielectric energy storage capacitors. However, achieving high energy storage density typically requires high voltages or large electric fields, which limits their use in civilian applications. To broaden the application of AFE materials at low electric field, such as integrated circuits and power electronics, it is essential to decrease the phase transition electric field of antiferroelectric to ferroelectric (EA-F) and increase saturation polarization. In this study, (Pb0.88Ba0.09La0.02)(Zr0.6-xSn0.4Tix)O3(PBLZST) was synthesized using the traditional solid-state reaction method. By increasing the Ti4+ content, the EA-F was successfully decreased while simultaneously both saturation polarization and dielectric constant were enhanced. Notably, the (Pb0.88Ba0.09La0.02)(Zr0.48Sn0.4Ti0.12)O3 (T12) antiferroelectric ceramic achieved the lowest known EA-F = 0.72 kV/mm, along with a high saturation polarization of 43.62 μC/cm2. To better characterize the material's performance at low electric fields, a figure of merit u = Pmax/Eb was designed to characterize the ability to store charge, and a larger value of u indicated the advantage of the material in achieving higher saturation polarization under its maximum tolerable electric field. The T12 antiferroelectric ceramic exhibited u = 0.58 under its breakdown strength, outperforming most reported AFE ceramics. Additionally, the T12 ceramic demonstrated a high dielectric constant of 4543 at room temperature, and its P-E hysteresis loop displayed excellent frequency stability (1–100 Hz) and fatigue resistance (>20,000 cycles) at an applied field of 1 kV/mm. These results indicate that (Pb0.88Ba0.09La0.02)(Zr0.48Sn0.4Ti0.12)O3 antiferroelectric ceramics are promising candidates for civilian applications.</div></div>","PeriodicalId":267,"journal":{"name":"Ceramics International","volume":"51 8","pages":"Pages 10332-10339"},"PeriodicalIF":5.1,"publicationDate":"2025-03-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143594067","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Facile construction of copper nanoparticles decorated 3D calcium titanate toward tunable high dielectric and energy storage epoxy composites

IF 5.1 2区材料科学 Q1 MATERIALS SCIENCE, CERAMICS

Ceramics International

Pub Date : 2025-03-01 DOI: 10.1016/j.ceramint.2024.12.489

Yongzhi Yang , Xiaoqian Liu , Yuchao Li , Minghui Lu , Ziyu Zhang , Yanhu Zhan , Yankai Li , Zhi-Min Dang , Shao-Long Zhong , Dongxin He , Zhicheng Shi

With the continuous development of semiconductor power electronic devices and the rising operating frequencies of systems such as 5G, there is an urgent need for energy storage units that exhibit high dielectric constants and energy densities while simultaneously reducing dielectric losses. Achieving this optimization is critical for mitigating thermal failure in electronic devices and enhancing their operational reliability and service life. A 3D CTO-Cu/epoxy (EP) dielectric composite has been successfully fabricated by reverse-infiltrating epoxy into a pre-constructed 3D network of calcium titanate (CTO) decorated with copper nanoparticles. The continuous 3D CTO architecture, created via a facile sol-gel process, ensures uniform distribution of copper (Cu) nanoparticles throughout the structure, synergistically enhancing the overall performance of 3D CTO-Cu/EP composite. Moreover, in virtue of the equivalent micro-capacitors and the Coulomb-blockade effect generated by the Cu nanoparticles, the dielectric properties of the 3D CTO-Cu/EP composites were significantly enhanced, while the dielectric loss was simultaneously and effectively suppressed—an achievement that is particularly challenging to realize. The 3D CTO-0.2Cu/EP system achieved the highest dielectric constant of 28.0 (at 1 kHz) and the lowest dielectric loss of 0.021, which are 184 % and 70 % improvements over the 3D CTO/EP composite, respectively, offering an effective method to adjust the dielectric and energy storage properties of polymer-based dielectrics.

{"title":"Facile construction of copper nanoparticles decorated 3D calcium titanate toward tunable high dielectric and energy storage epoxy composites","authors":"Yongzhi Yang , Xiaoqian Liu , Yuchao Li , Minghui Lu , Ziyu Zhang , Yanhu Zhan , Yankai Li , Zhi-Min Dang , Shao-Long Zhong , Dongxin He , Zhicheng Shi","doi":"10.1016/j.ceramint.2024.12.489","DOIUrl":"10.1016/j.ceramint.2024.12.489","url":null,"abstract":"<div><div>With the continuous development of semiconductor power electronic devices and the rising operating frequencies of systems such as 5G, there is an urgent need for energy storage units that exhibit high dielectric constants and energy densities while simultaneously reducing dielectric losses. Achieving this optimization is critical for mitigating thermal failure in electronic devices and enhancing their operational reliability and service life. A 3D CTO-Cu/epoxy (EP) dielectric composite has been successfully fabricated by reverse-infiltrating epoxy into a pre-constructed 3D network of calcium titanate (CTO) decorated with copper nanoparticles. The continuous 3D CTO architecture, created via a facile sol-gel process, ensures uniform distribution of copper (Cu) nanoparticles throughout the structure, synergistically enhancing the overall performance of 3D CTO-Cu/EP composite. Moreover, in virtue of the equivalent micro-capacitors and the Coulomb-blockade effect generated by the Cu nanoparticles, the dielectric properties of the 3D CTO-Cu/EP composites were significantly enhanced, while the dielectric loss was simultaneously and effectively suppressed—an achievement that is particularly challenging to realize. The 3D CTO-0.2Cu/EP system achieved the highest dielectric constant of 28.0 (at 1 kHz) and the lowest dielectric loss of 0.021, which are 184 % and 70 % improvements over the 3D CTO/EP composite, respectively, offering an effective method to adjust the dielectric and energy storage properties of polymer-based dielectrics.</div></div>","PeriodicalId":267,"journal":{"name":"Ceramics International","volume":"51 8","pages":"Pages 10582-10589"},"PeriodicalIF":5.1,"publicationDate":"2025-03-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143594223","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Low-temperature solid-state reaction synthesis of SrY2O4 with high near-infrared reflectance and low thermal conductivity 低温固态反应合成具有高近红外反射率和低热导率的 SrY2O4

IF 5.1 2区材料科学 Q1 MATERIALS SCIENCE, CERAMICS

Ceramics International

Pub Date : 2025-03-01 DOI: 10.1016/j.ceramint.2024.12.438

Weilun Qian , Yan Ma , Zhoufu Wang , Hao Liu , Zhongfeng Xia , Zhenghuang Quan , Xitang Wang , Shenghao Zeng , Weidong Fu , Luwei Fu

The near-infrared (NIR) reflective thermal insulation coating can effectively reflect heat and protect the base materials. With excellent high-temperature stability and low thermal conductivity, SrY₂O₄ attracted much attention due to its unique thermophysical characteristics. However, the NIR reflectance of SrY₂O₄ is scarcely reported. In this work, a novel low-temperature solid-state reaction synthesis of SrY₂O₄ is explored, which aims to solve the problems of high temperature (1400–1650 °C) and repeated calcination during the synthesis process via conventional solid-state reaction method, and the NIR reflectance of SrY₂O₄ is evaluated. SrY₂O₄ powders with few Y₂O₃ impurities are obtained at 1100–1300 °C via low-temperature solid-state reaction method. And Y₂O₃ impurities are successfully eliminated, resulting in a simple synthesis of single-phase SrY₂O₄ powder at 1200 °C by adjusting the ratio of raw materials to n (Sr²⁺):n (Y³⁺) = 1.10:2. The thermal decomposition process and composition of the precursor were analyzed by Fourier transform infrared spectrum (FTIR) and thermogravimetric/differential scanning calorimetry (TG-DSC), respectively. The cell parameters, micromorphology, NIR reflectance and thermal conductivity of SrY₂O₄ powders synthesized via low-temperature and conventional solid-state reaction method are comparative studied. The result shows that single-phase SrY₂O₄ powder obtained via low-temperature solid-state reaction method has smaller cell parameters, minor particle size and higher NIR reflectance. The NIR reflectance maintains above 90 % and thermal conductivity at 25 °C is 7.37 W m⁻¹ K⁻¹.

{"title":"Low-temperature solid-state reaction synthesis of SrY2O4 with high near-infrared reflectance and low thermal conductivity","authors":"Weilun Qian , Yan Ma , Zhoufu Wang , Hao Liu , Zhongfeng Xia , Zhenghuang Quan , Xitang Wang , Shenghao Zeng , Weidong Fu , Luwei Fu","doi":"10.1016/j.ceramint.2024.12.438","DOIUrl":"10.1016/j.ceramint.2024.12.438","url":null,"abstract":"<div><div>The near-infrared (NIR) reflective thermal insulation coating can effectively reflect heat and protect the base materials. With excellent high-temperature stability and low thermal conductivity, SrY2O4 attracted much attention due to its unique thermophysical characteristics. However, the NIR reflectance of SrY2O4 is scarcely reported. In this work, a novel low-temperature solid-state reaction synthesis of SrY2O4 is explored, which aims to solve the problems of high temperature (1400–1650 °C) and repeated calcination during the synthesis process via conventional solid-state reaction method, and the NIR reflectance of SrY2O4 is evaluated. SrY2O4 powders with few Y2O3 impurities are obtained at 1100–1300 °C via low-temperature solid-state reaction method. And Y2O3 impurities are successfully eliminated, resulting in a simple synthesis of single-phase SrY2O4 powder at 1200 °C by adjusting the ratio of raw materials to n (Sr2+):n (Y3+) = 1.10:2. The thermal decomposition process and composition of the precursor were analyzed by Fourier transform infrared spectrum (FTIR) and thermogravimetric/differential scanning calorimetry (TG-DSC), respectively. The cell parameters, micromorphology, NIR reflectance and thermal conductivity of SrY2O4 powders synthesized via low-temperature and conventional solid-state reaction method are comparative studied. The result shows that single-phase SrY2O4 powder obtained via low-temperature solid-state reaction method has smaller cell parameters, minor particle size and higher NIR reflectance. The NIR reflectance maintains above 90 % and thermal conductivity at 25 °C is 7.37 W m−1 K−1.</div></div>","PeriodicalId":267,"journal":{"name":"Ceramics International","volume":"51 8","pages":"Pages 10069-10076"},"PeriodicalIF":5.1,"publicationDate":"2025-03-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143593698","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Electrochemical oxidation and corrosion behavior of 3D printed reaction-bonded silicon carbide ceramics in eco-friendly electrolyte

IF 5.1 2区材料科学 Q1 MATERIALS SCIENCE, CERAMICS

Ceramics International

Pub Date : 2025-03-01 DOI: 10.1016/j.ceramint.2024.12.330

Chenxin Li , Yong Liu , Kan Wang , Yipeng Qin , Xiaotong Wu

3D printed reaction-bonded silicon carbide (RBSiC) is widely employed across various industries due to its complex geometries and exceptional properties. However, its precise machining remains a significant challenge. Electrochemical grinding (ECG) presents a promising solution for the precise machining of RBSiC. Still, further optimization of the process is still required. In this study, we investigate the electrochemical oxidation and corrosion behavior of 3D printed RBSiC in an eco-friendly KH₂PO₄ electrolyte, characterize its microstructure and phases composition, and developed a predictive model for the thickness of the oxidation layer. Experimental results show that the oxidation process of RBSiC, influenced by free silicon, is intricate and segmented, involving the oxidation of Si and SiC as well as Si over-passivation under high voltage. SEM reveals that the oxide film thickness ranges from 1.57 μm to 15.5 μm. EIS and microstructural analysis identify micro defects filled with electrolyte in the oxide layer at high voltage, causing the dielectric constant to surge to 19.65—a nearly 500 % increase. Thus, this study calibrates oxidation current efficiency (η) and the real dielectric constant (

ε_{r a}

) of RBSiC in KH₂PO₄ electrolyte, leading to the development of a three-stage predictive model that matching with the observed oxide film growth trends. These findings provide a theoretical framework and empirical data for optimizing ECG processing of RBSiC.

{"title":"Electrochemical oxidation and corrosion behavior of 3D printed reaction-bonded silicon carbide ceramics in eco-friendly electrolyte","authors":"Chenxin Li , Yong Liu , Kan Wang , Yipeng Qin , Xiaotong Wu","doi":"10.1016/j.ceramint.2024.12.330","DOIUrl":"10.1016/j.ceramint.2024.12.330","url":null,"abstract":"<div><div>3D printed reaction-bonded silicon carbide (RBSiC) is widely employed across various industries due to its complex geometries and exceptional properties. However, its precise machining remains a significant challenge. Electrochemical grinding (ECG) presents a promising solution for the precise machining of RBSiC. Still, further optimization of the process is still required. In this study, we investigate the electrochemical oxidation and corrosion behavior of 3D printed RBSiC in an eco-friendly KH2PO4 electrolyte, characterize its microstructure and phases composition, and developed a predictive model for the thickness of the oxidation layer. Experimental results show that the oxidation process of RBSiC, influenced by free silicon, is intricate and segmented, involving the oxidation of Si and SiC as well as Si over-passivation under high voltage. SEM reveals that the oxide film thickness ranges from 1.57 μm to 15.5 μm. EIS and microstructural analysis identify micro defects filled with electrolyte in the oxide layer at high voltage, causing the dielectric constant to surge to 19.65—a nearly 500 % increase. Thus, this study calibrates oxidation current efficiency (η) and the real dielectric constant (<math><mrow><msub><mi>ε</mi><mrow><mi>r</mi><mi>a</mi></mrow></msub></mrow></math>) of RBSiC in KH2PO4 electrolyte, leading to the development of a three-stage predictive model that matching with the observed oxide film growth trends. These findings provide a theoretical framework and empirical data for optimizing ECG processing of RBSiC.</div></div>","PeriodicalId":267,"journal":{"name":"Ceramics International","volume":"51 7","pages":"Pages 8997-9011"},"PeriodicalIF":5.1,"publicationDate":"2025-03-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143512107","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Enhanced energy storage performance of high entropy (1-x)(Na0.5Li0.5NbO3)-x(Sr0.5Bi0.5)(Fe0.5Ti0.25Zr0.25)O3 dielectric ceramics through non-equivalent ion doping

IF 5.1 2区材料科学 Q1 MATERIALS SCIENCE, CERAMICS

Ceramics International

Pub Date : 2025-03-01 DOI: 10.1016/j.ceramint.2024.12.353

Y.Q. Guo , Aditya Jain , H.Z. Zhou , Y.G. Wang

High entropy dielectric ceramics with excellent relaxation characteristics are ideal materials for pulse capacitors. In this study, a high entropy dielectric ceramic based on NaNbO₃ was engineered to enhance relaxation properties through non-equivalent ion substitution and increased entropy. The composition studied was (1-x)(Na_0.5Li_0.5NbO₃) - x(Sr_0.5Bi_0.5)(Fe_0.5Ti_0.25Zr_0.25)O₃ (NLN-SBFTZ) with x = 0, 0.15, 0.20, and 0.25. The introduction of non-equivalent ions (Sr_0.5Bi_0.5)^5/2+ and (Fe_0.5Ti_0.25Zr_0.25)^7/2+, significantly increases the configurational entropy (ΔS_config). With a breakdown field strength of 500 kV/cm, the modified ceramics sample (x = 0.20) shows a recoverable energy density (W_rec) of 4.70 J/cm³ and an energy efficiency (η) of 83.5 %, surpassing the performance of undoped samples (W_rec = 0.15 J/cm³, η = 43.2 %). These results confirm that the high entropy design strategy via non-equivalent ion doping effectively enhances the energy storage capabilities of lead-free dielectric materials.

{"title":"Enhanced energy storage performance of high entropy (1-x)(Na0.5Li0.5NbO3)-x(Sr0.5Bi0.5)(Fe0.5Ti0.25Zr0.25)O3 dielectric ceramics through non-equivalent ion doping","authors":"Y.Q. Guo , Aditya Jain , H.Z. Zhou , Y.G. Wang","doi":"10.1016/j.ceramint.2024.12.353","DOIUrl":"10.1016/j.ceramint.2024.12.353","url":null,"abstract":"<div><div>High entropy dielectric ceramics with excellent relaxation characteristics are ideal materials for pulse capacitors. In this study, a high entropy dielectric ceramic based on NaNbO3 was engineered to enhance relaxation properties through non-equivalent ion substitution and increased entropy. The composition studied was (1-x)(Na0.5Li0.5NbO3) - x(Sr0.5Bi0.5)(Fe0.5Ti0.25Zr0.25)O3 (NLN-SBFTZ) with x = 0, 0.15, 0.20, and 0.25. The introduction of non-equivalent ions (Sr0.5Bi0.5)5/2+ and (Fe0.5Ti0.25Zr0.25)7/2+, significantly increases the configurational entropy (ΔSconfig). With a breakdown field strength of 500 kV/cm, the modified ceramics sample (x = 0.20) shows a recoverable energy density (Wrec) of 4.70 J/cm3 and an energy efficiency (η) of 83.5 %, surpassing the performance of undoped samples (Wrec = 0.15 J/cm3, η = 43.2 %). These results confirm that the high entropy design strategy via non-equivalent ion doping effectively enhances the energy storage capabilities of lead-free dielectric materials.</div></div>","PeriodicalId":267,"journal":{"name":"Ceramics International","volume":"51 7","pages":"Pages 9199-9208"},"PeriodicalIF":5.1,"publicationDate":"2025-03-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143510847","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Alkali metal ion codoped Eu3+ activated yttrium orthovanadate with tunable photoluminescence properties for LEDs and anti-counterfeiting applications

IF 5.1 2区材料科学 Q1 MATERIALS SCIENCE, CERAMICS

Ceramics International

Pub Date : 2025-03-01 DOI: 10.1016/j.ceramint.2024.12.310

Anuradha , Arpita Dwivedi , Satyam Upadhyay , Amit Srivastava , Monika Srivastava , Rajneesh Kumar , S.K. Srivastava

The present experimental report articulates a comprehensive investigation on the synthesis, structural, and photoluminescence characteristics of M_0.05,Eu_0.05:Y_0.90VO₄ (M = Li⁺, Na⁺, K⁺) nanophosphors synthesised by auto-combustion approach, for optical display and anticounterfeiting technologies. Various characterization tools such as X-ray diffractometer (XRD), Transmission Electron Microscope (TEM), Scanning Electron Microscope (SEM), Fourier transform infra-red (FTIR) Spectroscope, and Raman spectroscope have been employed to understand the morphology and crystal structure of M_0.05,Eu_0.05:Y_0.90VO₄ (M = Li⁺, Na⁺, K⁺) nanophosphor, which reveals the formation of a pure tetragonal structure and well crystalline phase. Moreover, the UV–Vis spectra, suggests that the as-synthesised material substantiated to possess an energy band gap of ∼3.6 eV conjecturing it as a wide-band material, and the refractive index (n) of the prepared samples has been deduced as ∼ 2.1. Among all alkali ions, Li⁺-codoped sample exhibits the most intense PL spectra. The enhancement in PL intensity has been observed due to the energy transfer of VO₄³⁻→Eu³⁺ and the codoping of lithium ions acts as a good charge compensator. For the optimized sample CIE coordinates has been found as (0.59, 0.39) and CCT value as 1712 K, which suggest it as a prospective candidate for the warm LEDs. The optimized sample has further been investigated for the visualization of Latent fingerprint on glass slide and as security ink. It displays efficient applicability as a well-defined ridge features up to level III. Henceforth, the as-synthesised Li_0.05,Eu_0.05:Y_0.90VO₄ nanophosphor may potentially be applied for multipurpose applications.

{"title":"Alkali metal ion codoped Eu3+ activated yttrium orthovanadate with tunable photoluminescence properties for LEDs and anti-counterfeiting applications","authors":"Anuradha , Arpita Dwivedi , Satyam Upadhyay , Amit Srivastava , Monika Srivastava , Rajneesh Kumar , S.K. Srivastava","doi":"10.1016/j.ceramint.2024.12.310","DOIUrl":"10.1016/j.ceramint.2024.12.310","url":null,"abstract":"<div><div>The present experimental report articulates a comprehensive investigation on the synthesis, structural, and photoluminescence characteristics of M0.05,Eu0.05:Y0.90VO4 (M = Li+, Na+, K+) nanophosphors synthesised by auto-combustion approach, for optical display and anticounterfeiting technologies. Various characterization tools such as X-ray diffractometer (XRD), Transmission Electron Microscope (TEM), Scanning Electron Microscope (SEM), Fourier transform infra-red (FTIR) Spectroscope, and Raman spectroscope have been employed to understand the morphology and crystal structure of M0.05,Eu0.05:Y0.90VO4 (M = Li+, Na+, K+) nanophosphor, which reveals the formation of a pure tetragonal structure and well crystalline phase. Moreover, the UV–Vis spectra, suggests that the as-synthesised material substantiated to possess an energy band gap of ∼3.6 eV conjecturing it as a wide-band material, and the refractive index (n) of the prepared samples has been deduced as ∼ 2.1. Among all alkali ions, Li+-codoped sample exhibits the most intense PL spectra. The enhancement in PL intensity has been observed due to the energy transfer of VO43−→Eu3+ and the codoping of lithium ions acts as a good charge compensator. For the optimized sample CIE coordinates has been found as (0.59, 0.39) and CCT value as 1712 K, which suggest it as a prospective candidate for the warm LEDs. The optimized sample has further been investigated for the visualization of Latent fingerprint on glass slide and as security ink. It displays efficient applicability as a well-defined ridge features up to level III. Henceforth, the as-synthesised Li0.05,Eu0.05:Y0.90VO4 nanophosphor may potentially be applied for multipurpose applications.</div></div>","PeriodicalId":267,"journal":{"name":"Ceramics International","volume":"51 7","pages":"Pages 8802-8815"},"PeriodicalIF":5.1,"publicationDate":"2025-03-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143510903","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Effects of bias voltage on the structure and ultrasonic response of LiNbO3 film transducers deposited by magnetron sputtering

IF 5.1 2区材料科学 Q1 MATERIALS SCIENCE, CERAMICS

Ceramics International

Pub Date : 2025-03-01 DOI: 10.1016/j.ceramint.2024.12.274

Xiaomei Zeng , Xiangyu Zhang , Chang Xu , Zhong Zeng , Yangyang Yu , Alexander Tolstoguzov , Xiangdong Ma , Huayong Hu , Jun Zhang , Bing Yang , Sheng Liu , Vasiliy O. Pelenovich

In this study, we deposited LiNbO₃ film ultrasonic transducers using RF magnetron sputtering technique. The effects of bias voltage applied to the samples, heat treatment, and deposition geometry on the structure, morphology, element distribution, phase composition, and piezoelectric properties of transducers were studied. The bias voltage significantly improves the uniformity of element distribution and partially suppresses the formation of secondary phases (LiNb₃O₈, NbO, and Nb₂O₅). The optimal bias value was within the range of 4–25 V, and higher bias voltages resulted in degradation of the transducer structure and piezoelectric performance. Short term heat treatment in air at 700 °C for 5 h significantly improved ultrasonic response. The influence of transducer thickness and tilt angle of columnar structure on piezoelectric response was also discussed. The maximum longitudinal and shear wave amplitudes were observed at tilt angles of 0 and ∼15 deg, respectively.

{"title":"Effects of bias voltage on the structure and ultrasonic response of LiNbO3 film transducers deposited by magnetron sputtering","authors":"Xiaomei Zeng , Xiangyu Zhang , Chang Xu , Zhong Zeng , Yangyang Yu , Alexander Tolstoguzov , Xiangdong Ma , Huayong Hu , Jun Zhang , Bing Yang , Sheng Liu , Vasiliy O. Pelenovich","doi":"10.1016/j.ceramint.2024.12.274","DOIUrl":"10.1016/j.ceramint.2024.12.274","url":null,"abstract":"<div><div>In this study, we deposited LiNbO3 film ultrasonic transducers using RF magnetron sputtering technique. The effects of bias voltage applied to the samples, heat treatment, and deposition geometry on the structure, morphology, element distribution, phase composition, and piezoelectric properties of transducers were studied. The bias voltage significantly improves the uniformity of element distribution and partially suppresses the formation of secondary phases (LiNb3O8, NbO, and Nb2O5). The optimal bias value was within the range of 4–25 V, and higher bias voltages resulted in degradation of the transducer structure and piezoelectric performance. Short term heat treatment in air at 700 °C for 5 h significantly improved ultrasonic response. The influence of transducer thickness and tilt angle of columnar structure on piezoelectric response was also discussed. The maximum longitudinal and shear wave amplitudes were observed at tilt angles of 0 and ∼15 deg, respectively.</div></div>","PeriodicalId":267,"journal":{"name":"Ceramics International","volume":"51 7","pages":"Pages 8439-8445"},"PeriodicalIF":5.1,"publicationDate":"2025-03-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143511860","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Impact of debinding atmosphere and sintering additives on the fabrication of alumina ceramics via vat photopolymerization

IF 5.1 2区材料科学 Q1 MATERIALS SCIENCE, CERAMICS

Ceramics International

Pub Date : 2025-03-01 DOI: 10.1016/j.ceramint.2024.12.336

P.L.A. Alves , I.L. Camargo , J.R. Verza , A.P. Luz

Vat photopolymerization of ceramic suspensions has received considerable attention due to its high precision and exceptional resolution, enabling the fabrication of intricate ceramic components. However, the polymer-based network formed during the printing process must be heated gradually to ensure the efficient release of gases generated from the decomposition of organic compounds, thereby preventing the formation of cracks in the ceramic structure. An alternative strategy to achieve ceramics with optimal properties is the incorporation of sintering additives into the compositions, which reduces the sintering temperature while enhancing densification of the parts during thermal treatments. This study examines the influence of debinding atmosphere (air or N₂) and sintering additives (TiO₂ and Nb₂O₅) on the fabrication of alumina ceramics using digital light processing, employing a commercially available, cost-effective, bottom-up LCD printer. Optimized debinding in an inert (N₂) atmosphere produced crack-free components with improved densification after sintering at 1400 °C and 1600 °C. Both additives were effective in altering the sintering behavior of alumina, increasing diffusion rates and promoting the formation of intergranular phases. As a result, specimens with a relative density of approximately 97.5 % were achieved.

{"title":"Impact of debinding atmosphere and sintering additives on the fabrication of alumina ceramics via vat photopolymerization","authors":"P.L.A. Alves , I.L. Camargo , J.R. Verza , A.P. Luz","doi":"10.1016/j.ceramint.2024.12.336","DOIUrl":"10.1016/j.ceramint.2024.12.336","url":null,"abstract":"<div><div>Vat photopolymerization of ceramic suspensions has received considerable attention due to its high precision and exceptional resolution, enabling the fabrication of intricate ceramic components. However, the polymer-based network formed during the printing process must be heated gradually to ensure the efficient release of gases generated from the decomposition of organic compounds, thereby preventing the formation of cracks in the ceramic structure. An alternative strategy to achieve ceramics with optimal properties is the incorporation of sintering additives into the compositions, which reduces the sintering temperature while enhancing densification of the parts during thermal treatments. This study examines the influence of debinding atmosphere (air or N₂) and sintering additives (TiO₂ and Nb₂O₅) on the fabrication of alumina ceramics using digital light processing, employing a commercially available, cost-effective, bottom-up LCD printer. Optimized debinding in an inert (N2) atmosphere produced crack-free components with improved densification after sintering at 1400 °C and 1600 °C. Both additives were effective in altering the sintering behavior of alumina, increasing diffusion rates and promoting the formation of intergranular phases. As a result, specimens with a relative density of approximately 97.5 % were achieved.</div></div>","PeriodicalId":267,"journal":{"name":"Ceramics International","volume":"51 7","pages":"Pages 9063-9072"},"PeriodicalIF":5.1,"publicationDate":"2025-03-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143512113","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0