Aqueous rechargeable zinc ion batteries (ARZIBs) represent a cheaper and more environmentally friendly alternative to lithium-ion batteries (LIBs) in energy storage systems. Vanadium oxide is one of the most attractive materials to be used as a cathode in ARZIBs because it has multiple oxidation states that grant high specific capacity. This work employed an alternative synthetic route to obtain VO2 with varied morphology and structural properties utilizing vanadyl acetylacetonate as a precursor by tuning the temperature during two-step solvothermal/hydrothermal treatment. When highly crystalline VO2 (B) with rod morphology is obtained, the electrode exhibits the best electrochemical response, with the most significant contribution of surface-confined redox processes to the charge stored. The ARZIB assembled with VO2 rod showed an initial capacity of up to ∼300 mA h g−1 (2.4 mA h cm−2) at 0.1 A g−1, delivering a specific energy of up to 168 W h kg−1 at a specific power of 65 W kg−1. It exhibits outstanding stability after 2000 GCD cycles at 2.5 A g−1. Ex-situ structural and spectroscopic characterization showed that Zn2+ storage causes an expansion and contraction of the lattice without evidence of crystalline phase transformations.
在储能系统中，水性可充电锌离子电池（ARZIBs）是锂离子电池（LIBs）的一种更便宜、更环保的替代品。氧化钒是 ARZIBs 中最有吸引力的阴极材料之一，因为它具有多种氧化态，能产生高比容量。这项研究采用了另一种合成路线，利用乙酰丙酮酸钒酯作为前驱体，在两步溶热/水热处理过程中调节温度，从而获得具有不同形态和结构特性的 VO2。当获得具有棒状形态的高结晶 VO2（B）时，电极表现出最佳的电化学响应，表面约束氧化还原过程对电荷存储的贡献最大。与 VO2 棒组装在一起的 ARZIB 在 0.1 A g-1 的条件下显示出高达 ∼300 mA h g-1 （2.4 mA h cm-2）的初始容量，在 65 W kg-1 的比功率条件下可提供高达 168 W kg-1 的比能量。在 2.5 A g-1 的条件下，经过 2000 次 GCD 循环后，它表现出卓越的稳定性。原位结构和光谱特性分析表明，Zn2+ 的储存会导致晶格的膨胀和收缩，但没有晶体相变的迹象。
{"title":"Impact of morphology and crystalline structure over the Zn2+ ions storage in two-step solvothermal derived VO2","authors":"Guadalupe Ramírez-Campos , Próspero Acevedo-Peña , Obed Pérez , Agileo Hernández-Gordillo , M. González M , J.A.I. Díaz-Góngora , Edilso Reguera","doi":"10.1016/j.ceramint.2024.09.269","DOIUrl":"10.1016/j.ceramint.2024.09.269","url":null,"abstract":"<div><div>Aqueous rechargeable zinc ion batteries (ARZIBs) represent a cheaper and more environmentally friendly alternative to lithium-ion batteries (LIBs) in energy storage systems. Vanadium oxide is one of the most attractive materials to be used as a cathode in ARZIBs because it has multiple oxidation states that grant high specific capacity. This work employed an alternative synthetic route to obtain VO<sub>2</sub> with varied morphology and structural properties utilizing vanadyl acetylacetonate as a precursor by tuning the temperature during two-step solvothermal/hydrothermal treatment. When highly crystalline VO<sub>2</sub> (B) with rod morphology is obtained, the electrode exhibits the best electrochemical response, with the most significant contribution of surface-confined redox processes to the charge stored. The ARZIB assembled with VO<sub>2</sub> rod showed an initial capacity of up to ∼300 mA h g<sup>−1</sup> (2.4 mA h cm<sup>−2</sup>) at 0.1 A g<sup>−1</sup>, delivering a specific energy of up to 168 W h kg<sup>−1</sup> at a specific power of 65 W kg<sup>−1</sup>. It exhibits outstanding stability after 2000 GCD cycles at 2.5 A g<sup>−1</sup>. Ex-situ structural and spectroscopic characterization showed that Zn<sup>2+</sup> storage causes an expansion and contraction of the lattice without evidence of crystalline phase transformations.</div></div>","PeriodicalId":267,"journal":{"name":"Ceramics International","volume":"50 23","pages":"Pages 49243-49253"},"PeriodicalIF":5.1,"publicationDate":"2024-09-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142664101","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}
In this research, we report an innovative sonochemical technique for synthesizing cerium oxide (CeO2) nanoparticles utilizing glucose as a capping agent, significantly boosting their photocatalytic performance under visible light. Through meticulous optimization, our CeO2 nanoparticles demonstrated exceptional degradation efficiencies: 97.2 % for Acid Red 14, 99.1 % for Captopril, 98.7 % for Malachite Green, and 98.3 % for Amlodipine, substantially outstripping performance metrics of commercial TiO2 and untreated samples. Our kinetic analyses, based on the Langmuir-Hinshelwood model, indicated a superior rate constant of 0.0701 min⁻1 for Acid Red 14 degradation—reflecting a stark enhancement over other catalysts tested. Furthermore, mechanistic insights revealed that the significant improvement in photocatalytic activity was predominantly due to the generation of hydroxyl radicals and effective utilization of electron vacancies, with the role of these reactive species validated by detailed scavenger tests. This enhancement in photocatalytic efficiency is attributed to the sonochemical synthesis paired with glucose modification, which optimizes the nanoparticles' surface characteristics crucial for reactivity. Moreover, the nanoparticles showcased remarkable stability and reusability, maintaining an 87.8 % degradation rate after 11 cycles, evidencing minimal loss in activity and underscoring their potential for long-term applications in environmental remediation. This study not only paves the way for the practical application of CeO2 nanoparticles in pollutant degradation but also illustrates the broader applicability of sonochemically synthesized nanomaterials in sustainable environmental management, offering a promising solution to the challenge of complex organic pollutants in aquatic environments.
{"title":"Innovative fabrication of highly efficient CeO2 ceramic nanomaterials for enhanced photocatalytic degradation of toxic contaminants under sunlight","authors":"Sahar Zinatloo-Ajabshir , Zohreh Mehrabadi , Hossein Khojasteh , Fariborz Sharifianjazi","doi":"10.1016/j.ceramint.2024.09.271","DOIUrl":"10.1016/j.ceramint.2024.09.271","url":null,"abstract":"<div><div>In this research, we report an innovative sonochemical technique for synthesizing cerium oxide (CeO<sub>2</sub>) nanoparticles utilizing glucose as a capping agent, significantly boosting their photocatalytic performance under visible light. Through meticulous optimization, our CeO<sub>2</sub> nanoparticles demonstrated exceptional degradation efficiencies: 97.2 % for Acid Red 14, 99.1 % for Captopril, 98.7 % for Malachite Green, and 98.3 % for Amlodipine, substantially outstripping performance metrics of commercial TiO<sub>2</sub> and untreated samples. Our kinetic analyses, based on the Langmuir-Hinshelwood model, indicated a superior rate constant of 0.0701 min⁻<sup>1</sup> for Acid Red 14 degradation—reflecting a stark enhancement over other catalysts tested. Furthermore, mechanistic insights revealed that the significant improvement in photocatalytic activity was predominantly due to the generation of hydroxyl radicals and effective utilization of electron vacancies, with the role of these reactive species validated by detailed scavenger tests. This enhancement in photocatalytic efficiency is attributed to the sonochemical synthesis paired with glucose modification, which optimizes the nanoparticles' surface characteristics crucial for reactivity. Moreover, the nanoparticles showcased remarkable stability and reusability, maintaining an 87.8 % degradation rate after 11 cycles, evidencing minimal loss in activity and underscoring their potential for long-term applications in environmental remediation. This study not only paves the way for the practical application of CeO<sub>2</sub> nanoparticles in pollutant degradation but also illustrates the broader applicability of sonochemically synthesized nanomaterials in sustainable environmental management, offering a promising solution to the challenge of complex organic pollutants in aquatic environments.</div></div>","PeriodicalId":267,"journal":{"name":"Ceramics International","volume":"50 23","pages":"Pages 49263-49276"},"PeriodicalIF":5.1,"publicationDate":"2024-09-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142664113","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}
Pub Date : 2024-09-21DOI: 10.1016/j.ceramint.2024.09.276
Priya Malik , Rakesh Malik , Surender Duhan
Sensors utilizing mesoporous materials have garnered significant interest; however, they are primarily designed for detecting a single analyte. In this study, we successfully synthesized a three-dimensional (3D) hollow mesoporous α-Fe2O3 using a nanocasting process for the purpose of sensing LPG and humidity. The α-Fe2O3 obtained in this study maintained the cubic framework structure of MCM-48, demonstrating a mesoporous and hollow architecture. The Liquified Petroleum Gas (LPG) sensing characteristics of mesoporous α-Fe2O3 were examined at different operating temperatures (170–210 °C). The gas sensing response was optimized 99.3 % at 190 °C and the response/recovery time comes out to be 11.79 s & 0.84 s respectively. The humidity sensor's traits were evaluated at room temperature, with relative humidity (RH%) ranging from 11 % to 98 %, using mesoporous α- Fe2O3. The response/recovery time of mesoporous α-Fe2O3 as a humidity sensor comes out to be 6.3 s & 7.2 s respectively. The highly sensitive nature of the sensor along with negligible hysteresis, excellent repeatability and considerable stability for 30 days makes it a promisable candidate for real-time subtle respiration monitoring. Meanwhile, mesoporous α-Fe2O3 humidity sensor is also utilized for evaluation of sleep hypopnea-apnea syndrome.
{"title":"3D hollow mesoporous α-Fe2O3 sensor detecting liquified petroleum gas and humidity for diagnosing sleep hypopnea-apnea syndrome","authors":"Priya Malik , Rakesh Malik , Surender Duhan","doi":"10.1016/j.ceramint.2024.09.276","DOIUrl":"10.1016/j.ceramint.2024.09.276","url":null,"abstract":"<div><div>Sensors utilizing mesoporous materials have garnered significant interest; however, they are primarily designed for detecting a single analyte. In this study, we successfully synthesized a three-dimensional (3D) hollow mesoporous α-Fe<sub>2</sub>O<sub>3</sub> using a nanocasting process for the purpose of sensing LPG and humidity. The α-Fe<sub>2</sub>O<sub>3</sub> obtained in this study maintained the cubic framework structure of MCM-48, demonstrating a mesoporous and hollow architecture. The Liquified Petroleum Gas (LPG) sensing characteristics of mesoporous α-Fe<sub>2</sub>O<sub>3</sub> were examined at different operating temperatures (170–210 °C). The gas sensing response was optimized 99.3 % at 190 °C and the response/recovery time comes out to be 11.79 s & 0.84 s respectively. The humidity sensor's traits were evaluated at room temperature, with relative humidity (RH%) ranging from 11 % to 98 %, using mesoporous α- Fe<sub>2</sub>O<sub>3</sub>. The response/recovery time of mesoporous α-Fe<sub>2</sub>O<sub>3</sub> as a humidity sensor comes out to be 6.3 s & 7.2 s respectively. The highly sensitive nature of the sensor along with negligible hysteresis, excellent repeatability and considerable stability for 30 days makes it a promisable candidate for real-time subtle respiration monitoring. Meanwhile, mesoporous α-Fe<sub>2</sub>O<sub>3</sub> humidity sensor is also utilized for evaluation of sleep hypopnea-apnea syndrome.</div></div>","PeriodicalId":267,"journal":{"name":"Ceramics International","volume":"50 23","pages":"Pages 49311-49325"},"PeriodicalIF":5.1,"publicationDate":"2024-09-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142664334","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}
Pub Date : 2024-09-21DOI: 10.1016/j.ceramint.2024.09.278
Rui Feng Ouyang , Xiao Li Su , Tao Zeng , Gang Dong , Yun Xia Chen , Lei Li
It is an effective method to prepare ZrO2 ceramics by cold sintering (CS) and the subsequent pressure-less sintering (PLS), while the compacting problems are serious during the CS process with high pressure and high temperature, such as delamination, cracking and sticking to steel mold. To solve these problems, polyacrylic acid (PAA) is utilized as the organic binder, with the aid of which the 3 mol% yttrium-doped zirconia (3YSZ) nanopowder can be well compacted by CS under mild conditions (200 MPa, 100 °C). Compared to the conventional dry-pressed compacts, the particle agglomerations are observed in cold-sintered compacts as well as the slightly increased relative density, which lead to a significant improvement of Vickers Hardness (Hv) by 78 %. Consequently, the CS-PLS ceramics sintered at 1400 °C also exhibit a higher relative density (99.76 %) and better mechanical properties (Hv = 14.8 GPa, fracture toughness KIC = 6.49 MPa m1/2, flexural strength σ = 380.64 MPa) than the PLS ones without cold sintering, indicating that the CS-PLS process with mild conditions for CS is promising for preparing the denser and stronger YSZ ceramics.
{"title":"Improved mechanical properties of 3YSZ ceramics prepared by pressure-less sintering assisted by cold sintering under mild conditions","authors":"Rui Feng Ouyang , Xiao Li Su , Tao Zeng , Gang Dong , Yun Xia Chen , Lei Li","doi":"10.1016/j.ceramint.2024.09.278","DOIUrl":"10.1016/j.ceramint.2024.09.278","url":null,"abstract":"<div><div>It is an effective method to prepare ZrO<sub>2</sub> ceramics by cold sintering (CS) and the subsequent pressure-less sintering (PLS), while the compacting problems are serious during the CS process with high pressure and high temperature, such as delamination, cracking and sticking to steel mold. To solve these problems, polyacrylic acid (PAA) is utilized as the organic binder, with the aid of which the 3 mol% yttrium-doped zirconia (3YSZ) nanopowder can be well compacted by CS under mild conditions (200 MPa, 100 °C). Compared to the conventional dry-pressed compacts, the particle agglomerations are observed in cold-sintered compacts as well as the slightly increased relative density, which lead to a significant improvement of Vickers Hardness (<em>H</em><sub><em>v</em></sub>) by 78 %. Consequently, the CS-PLS ceramics sintered at 1400 °C also exhibit a higher relative density (99.76 %) and better mechanical properties (<em>H</em><sub><em>v</em></sub> = 14.8 GPa, fracture toughness <em>K</em><sub><em>IC</em></sub> = 6.49 MPa m<sup>1/2</sup>, flexural strength <em>σ</em> = 380.64 MPa) than the PLS ones without cold sintering, indicating that the CS-PLS process with mild conditions for CS is promising for preparing the denser and stronger YSZ ceramics.</div></div>","PeriodicalId":267,"journal":{"name":"Ceramics International","volume":"50 23","pages":"Pages 49339-49345"},"PeriodicalIF":5.1,"publicationDate":"2024-09-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142664349","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}
Pub Date : 2024-09-21DOI: 10.1016/j.ceramint.2024.09.272
Hao Zhuo , Teng Li , Shudong Hu , Botao Shao , Yanqi Wu , Fanda Zeng , Liqiang Xu , Feng Chen
Lead-free K0.5Na0.5NbO3 (KNN) ferroelectric film and transparent La0.06Ba0.94SnO3 (LBSO) bottom electrode are fabricated on (001)-oriented SrTiO3 (STO) substrate by sol-gel. The characterization results confirm an epitaxial relationship between the films and the substrate, as well as a uniform structure and good crystallization quality of the films. The optical measurement shows that the film heterostructure exhibit a high transmittance with a maximum transmittance of ∼80 %. The polarization-electric field (P-E) curves demonstrate that the twice remanent polarization value of the ∼500 nm thick KNN film reaches up to 28 μC/cm2 under an electric field of 800 kV/cm, and the effective piezoelectric strain constant (d33∗) is measured as 24.8 p.m./V. The dielectric properties of the film are displayed, and the leakage behavior can be divided into three stages of Ohmic conduction, Schottky emission and Poole-Frenkel emission with increasing the applied electric field. This study indicates that transparent lead-free ferroelectric KNN heterostructures can be prepared using a cost-effective sol-gel method and shows promise for future applications.
{"title":"Sol-gel fabrication of transparent ferroelectric (K,Na)NbO3/La0.06Ba0.94SnO3 heterostructure","authors":"Hao Zhuo , Teng Li , Shudong Hu , Botao Shao , Yanqi Wu , Fanda Zeng , Liqiang Xu , Feng Chen","doi":"10.1016/j.ceramint.2024.09.272","DOIUrl":"10.1016/j.ceramint.2024.09.272","url":null,"abstract":"<div><div>Lead-free K<sub>0.5</sub>Na<sub>0.5</sub>NbO<sub>3</sub> (KNN) ferroelectric film and transparent La<sub>0.06</sub>Ba<sub>0.94</sub>SnO<sub>3</sub> (LBSO) bottom electrode are fabricated on (001)-oriented SrTiO<sub>3</sub> (STO) substrate by sol-gel. The characterization results confirm an epitaxial relationship between the films and the substrate, as well as a uniform structure and good crystallization quality of the films. The optical measurement shows that the film heterostructure exhibit a high transmittance with a maximum transmittance of ∼80 %. The polarization-electric field (<em>P-E</em>) curves demonstrate that the twice remanent polarization value of the ∼500 nm thick KNN film reaches up to 28 μC/cm<sup>2</sup> under an electric field of 800 kV/cm, and the effective piezoelectric strain constant (<em>d</em><sub>33</sub>∗) is measured as 24.8 p.m./V. The dielectric properties of the film are displayed, and the leakage behavior can be divided into three stages of Ohmic conduction, Schottky emission and Poole-Frenkel emission with increasing the applied electric field. This study indicates that transparent lead-free ferroelectric KNN heterostructures can be prepared using a cost-effective sol-gel method and shows promise for future applications.</div></div>","PeriodicalId":267,"journal":{"name":"Ceramics International","volume":"50 23","pages":"Pages 49277-49284"},"PeriodicalIF":5.1,"publicationDate":"2024-09-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142664114","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}
Pub Date : 2024-09-21DOI: 10.1016/j.ceramint.2024.09.281
Pengdou Yun , Maolin Zhang , Dongyan Zhang , Zhimin Li , Li Jin , Yangxi Yan
Piezoceramics have long encountered difficulties in simultaneously attaining a high Curie temperature (TC) and extraordinary electrical characteristics due to the issue of thermal depolarization. To handle this, a novel 0.1 Pb(Yb0.5Nb0.5)O3 (PYN)–0.9 Pb(Hf1−xTix)O3 (PHT) + x mol%Ta2O5 piezoelectric ceramic was prepared using solid-state sintering method. We developed a synergistic strategy in introducing local heterogeneity into the tetragonal phase, where doping with heterovalent Ta5+ ions significantly reduces the temperature dependence of PYN–PHT piezoelectric ceramics. The structure and electrical behavior of obtained ceramics were methodically investigated using various analytical approaches. Our innovative composition, PYN–PHT–0.6Ta, showcases tetragonal phases. It exhibits impressive results, such as a piezoelectric coefficient d33 of 560 pC/N, an electromechanical coupling coefficient of 0.7 and a TC of 312.2 °C. Doping with Ta5+ ions unveils the formation of small size, mixed-state domain structure in enhancing piezoelectric and dielectric properties of ceramics. Additionally, the pinning effect of tetragonal phase contribute to the remarkable temperature stability (the variation in d33 is only 6.03 % from 25 °C to 300 °C) of the material. Overall, the exceptional performance and high quality of PYN–PHT–xTa ceramics hold great promise for high-temperature application in future microdevices.
{"title":"Enhancing response and thermal stability of PYN–PHT ceramics through design of \"mixed-state\" domain structures","authors":"Pengdou Yun , Maolin Zhang , Dongyan Zhang , Zhimin Li , Li Jin , Yangxi Yan","doi":"10.1016/j.ceramint.2024.09.281","DOIUrl":"10.1016/j.ceramint.2024.09.281","url":null,"abstract":"<div><div>Piezoceramics have long encountered difficulties in simultaneously attaining a high Curie temperature (<em>T</em><sub><em>C</em></sub>) and extraordinary electrical characteristics due to the issue of thermal depolarization. To handle this, a novel 0.1 Pb(Yb<sub>0.5</sub>Nb<sub>0.5</sub>)O<sub>3</sub> (PYN)–0.9 Pb(Hf<sub>1−x</sub>Ti<sub>x</sub>)O<sub>3</sub> (PHT) + <em>x</em> mol%Ta<sub>2</sub>O<sub>5</sub> piezoelectric ceramic was prepared using solid-state sintering method. We developed a synergistic strategy in introducing local heterogeneity into the tetragonal phase, where doping with heterovalent Ta<sup>5+</sup> ions significantly reduces the temperature dependence of PYN–PHT piezoelectric ceramics. The structure and electrical behavior of obtained ceramics were methodically investigated using various analytical approaches. Our innovative composition, PYN–PHT–0.6Ta, showcases tetragonal phases. It exhibits impressive results, such as a piezoelectric coefficient <em>d</em><sub>33</sub> of 560 pC/N, an electromechanical coupling coefficient of 0.7 and a <em>T</em><sub><em>C</em></sub> of 312.2 °C. Doping with Ta<sup>5+</sup> ions unveils the formation of small size, mixed-state domain structure in enhancing piezoelectric and dielectric properties of ceramics. Additionally, the pinning effect of tetragonal phase contribute to the remarkable temperature stability (the variation in <em>d</em><sub><em>33</em></sub> is only 6.03 % from 25 °C to 300 °C) of the material. Overall, the exceptional performance and high quality of PYN–PHT–xTa ceramics hold great promise for high-temperature application in future microdevices.</div></div>","PeriodicalId":267,"journal":{"name":"Ceramics International","volume":"50 23","pages":"Pages 49365-49375"},"PeriodicalIF":5.1,"publicationDate":"2024-09-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142664352","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}
Pub Date : 2024-09-21DOI: 10.1016/j.ceramint.2024.09.274
Zhen'an Dou , Peng Li , Junyi Yu , Rong Sun , Shuhui Yu , Suibin Luo
The miniaturization of electronic devices has led to an increase in power density and functional integration, resulting in rapid heat accumulation that adversely affects operational stability and service life. Dielectric composite films with excellent thermal conductivity and insulating properties are highly desired for addressing thermal management issues in electronic packaging applications. Hexagonal boron nitride (h-BN) is a promising filler for such composites due to its outstanding thermal conductivity, insulating properties, and chemical stability. However, the inherent platelike structure of h-BN causes significant anisotropy and poor miscibility with polymers, limiting the uniform conduction of heat. This study proposes a high-temperature sintering method that transforms flaky h-BN plates into irregular multifaceted particles. This transformation reduces thermal anisotropy and creates uniform heat conduction pathways. The resulting sintered BN/Epoxy (s-BN/EP) composite films exhibit exceptional thermal conductivity, with in-plane thermal conductivity increased by 36 % to 6.0 W m−1 K−1 and through-plane thermal conductivity increased by 39 % to 1.2 W m−1 K−1 compared to pristine h-BN/epoxy composites. Moreover, s-BN/EP films could maintain low dielectric constant (Dk, 3.22) and dielectric loss (Df, 0.015) at 5 GHz. This innovative approach provides a significant advancement in the development of high-performance insulating polymer composites, offering a promising solution for thermal management in high-power-density electronic packaging.
{"title":"Epoxy composite films filled with sintered multifaceted boron nitride for thermal and dielectric applications","authors":"Zhen'an Dou , Peng Li , Junyi Yu , Rong Sun , Shuhui Yu , Suibin Luo","doi":"10.1016/j.ceramint.2024.09.274","DOIUrl":"10.1016/j.ceramint.2024.09.274","url":null,"abstract":"<div><div>The miniaturization of electronic devices has led to an increase in power density and functional integration, resulting in rapid heat accumulation that adversely affects operational stability and service life. Dielectric composite films with excellent thermal conductivity and insulating properties are highly desired for addressing thermal management issues in electronic packaging applications. Hexagonal boron nitride (h-BN) is a promising filler for such composites due to its outstanding thermal conductivity, insulating properties, and chemical stability. However, the inherent platelike structure of h-BN causes significant anisotropy and poor miscibility with polymers, limiting the uniform conduction of heat. This study proposes a high-temperature sintering method that transforms flaky h-BN plates into irregular multifaceted particles. This transformation reduces thermal anisotropy and creates uniform heat conduction pathways. The resulting sintered BN/Epoxy (s-BN/EP) composite films exhibit exceptional thermal conductivity, with in-plane thermal conductivity increased by 36 % to 6.0 W m<sup>−1</sup> K<sup>−1</sup> and through-plane thermal conductivity increased by 39 % to 1.2 W m<sup>−1</sup> K<sup>−1</sup> compared to pristine h-BN/epoxy composites. Moreover, s-BN/EP films could maintain low dielectric constant (<em>D</em><sub>k</sub>, 3.22) and dielectric loss (<em>D</em><sub>f</sub>, 0.015) at 5 GHz. This innovative approach provides a significant advancement in the development of high-performance insulating polymer composites, offering a promising solution for thermal management in high-power-density electronic packaging.</div></div>","PeriodicalId":267,"journal":{"name":"Ceramics International","volume":"50 23","pages":"Pages 49293-49299"},"PeriodicalIF":5.1,"publicationDate":"2024-09-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142664116","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}
Pub Date : 2024-09-21DOI: 10.1016/j.ceramint.2024.09.282
Tengfei Yu , Rongrong Chen , Xiang Ji , Zhijun Fu , Subing Jiang , Meizhen Gao
In this study, we investigated the phase structure, Curie temperature, dielectric properties, piezoelectricity, and energy-storage properties of BiFeO3 (BFO)-modified (Ba0.95Ca0.05) (Ti0.89Sn0.11)O3 (BCTSO) ceramics using both experimental and theoretical methods. The results indicated that the lattice distortion and chaotic distribution of the local charge increased with the BFO content, resulting in a phase transition and transformation from a ferroelectric to a relaxing ferroelectric. First-principles calculations revealed that the Curie temperature decreased with increasing BFO content, primarily because of an increase in the ground state energy. The variation in the permittivity of the BCTSO-xBFO ceramics with temperature and frequency is affected by the phase structure and Maxwell-Wagner interface polarisation, respectively. The electrical modulus measurements indicated that BCTSO-xBFO exhibited non-Debye-type dielectric relaxation for x = 0.0, 0.1, and 0.5 %, whereas BCTSO-xBFO showed Debye-type dielectric relaxation for x = 0.9%.
{"title":"Study on curie temperature mechanism and electrical properties of BiFeO3-doped (Ba,Ca) (Ti,Sn)O3 ceramics","authors":"Tengfei Yu , Rongrong Chen , Xiang Ji , Zhijun Fu , Subing Jiang , Meizhen Gao","doi":"10.1016/j.ceramint.2024.09.282","DOIUrl":"10.1016/j.ceramint.2024.09.282","url":null,"abstract":"<div><div>In this study, we investigated the phase structure, Curie temperature, dielectric properties, piezoelectricity, and energy-storage properties of BiFeO<sub>3</sub> (BFO)-modified (Ba<sub>0.95</sub>Ca<sub>0.05</sub>) (Ti<sub>0.89</sub>Sn<sub>0.11</sub>)O<sub>3</sub> (BCTSO) ceramics using both experimental and theoretical methods. The results indicated that the lattice distortion and chaotic distribution of the local charge increased with the BFO content, resulting in a phase transition and transformation from a ferroelectric to a relaxing ferroelectric. First-principles calculations revealed that the Curie temperature decreased with increasing BFO content, primarily because of an increase in the ground state energy. The variation in the permittivity of the BCTSO-<em>x</em>BFO ceramics with temperature and frequency is affected by the phase structure and Maxwell-Wagner interface polarisation, respectively. The electrical modulus measurements indicated that BCTSO-<em>x</em>BFO exhibited non-Debye-type dielectric relaxation for <em>x</em> = 0.0, 0.1, and 0.5 %, whereas BCTSO-<em>x</em>BFO showed Debye-type dielectric relaxation for <em>x</em> = 0.9%.</div></div>","PeriodicalId":267,"journal":{"name":"Ceramics International","volume":"50 23","pages":"Pages 49376-49384"},"PeriodicalIF":5.1,"publicationDate":"2024-09-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142664353","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}
Pub Date : 2024-09-20DOI: 10.1016/j.ceramint.2024.09.270
B. Suryanarayana , K.L.V. Nagasree , P.S.V. Shanmukhi , Jasgurpreet Singh Chohan , N. Murali , D. Parajuli , Tulu Wegayehu Mammo , Khalid Mujasam Batoo , Muhammad Farzik Ijaz , K. Samatha
The nano ferrite compounds Co1-xCuxFe2-yCeyO4 (with x values of 0.0, 0.25, 0.5, and 0.75, and y values of 0.0, 0.03, 0.06, and 0.09) were synthesized through the sol-gel auto-combustion method. The characteristics of spinel ferrites were tailored by creating nano ferrites with desirable properties, which were then sintered at 1150 °C for 2 h in the presence of rare earth (Ce3+) and transition metals (Cu2+). They were investigated using dielectric, FTIR, FESEM, XRD, VSM, and DC electrical resistivity experiments. XRD examination verified the samples' cubic spinel structure by measuring the average crystallite size, x-ray density, and lattice constant. FESEM images revealed grain sizes ranging from 41.07 to 156 nm. FTIR spectra in the range of 415 cm−1 to 430 cm−1 further supported the substitution of Cu2+/Ce3+ ions in the tetrahedral sites, indicated by an increase in the lattice parameter. Measurements of the remanence ratio, saturation magnetization, anisotropy constant, coercivity, and magnetic moment, among other magnetic characteristics, were made. Higher concentrations of Cu2+/Ce3+ ions were found to considerably reduce magnetic saturation (Ms), coercivity (Hc), and remanence (Mr). These materials were semiconducting because their activation energy varied between 0.52 and 0.62 eV, and their DC resistivity increased with increasing Cu2+/Ce3+ concentration. Above 1 MHz, the dielectric properties became frequency-independent and decreased with increasing frequency. These ferrites seem highly potential for devices working at high frequency.
{"title":"Impact of substituting Cu2+/Ce3+ cations on the structural, magnetic and electrical properties of cobalt nano ferrites","authors":"B. Suryanarayana , K.L.V. Nagasree , P.S.V. Shanmukhi , Jasgurpreet Singh Chohan , N. Murali , D. Parajuli , Tulu Wegayehu Mammo , Khalid Mujasam Batoo , Muhammad Farzik Ijaz , K. Samatha","doi":"10.1016/j.ceramint.2024.09.270","DOIUrl":"10.1016/j.ceramint.2024.09.270","url":null,"abstract":"<div><div>The nano ferrite compounds Co<sub>1-x</sub>Cu<sub>x</sub>Fe<sub>2-y</sub>Ce<sub>y</sub>O<sub>4</sub> (with x values of 0.0, 0.25, 0.5, and 0.75, and y values of 0.0, 0.03, 0.06, and 0.09) were synthesized through the sol-gel auto-combustion method. The characteristics of spinel ferrites were tailored by creating nano ferrites with desirable properties, which were then sintered at 1150 °C for 2 h in the presence of rare earth (Ce<sup>3+</sup>) and transition metals (Cu<sup>2+</sup>). They were investigated using dielectric, FTIR, FESEM, XRD, VSM, and DC electrical resistivity experiments. XRD examination verified the samples' cubic spinel structure by measuring the average crystallite size, x-ray density, and lattice constant. FESEM images revealed grain sizes ranging from 41.07 to 156 nm. FTIR spectra in the range of 415 cm<sup>−1</sup> to 430 cm<sup>−1</sup> further supported the substitution of Cu<sup>2+</sup>/Ce<sup>3+</sup> ions in the tetrahedral sites, indicated by an increase in the lattice parameter. Measurements of the remanence ratio, saturation magnetization, anisotropy constant, coercivity, and magnetic moment, among other magnetic characteristics, were made. Higher concentrations of Cu<sup>2+</sup>/Ce<sup>3+</sup> ions were found to considerably reduce magnetic saturation (Ms), coercivity (Hc), and remanence (Mr). These materials were semiconducting because their activation energy varied between 0.52 and 0.62 eV, and their DC resistivity increased with increasing Cu<sup>2+</sup>/Ce<sup>3+</sup> concentration. Above 1 MHz, the dielectric properties became frequency-independent and decreased with increasing frequency. These ferrites seem highly potential for devices working at high frequency.</div></div>","PeriodicalId":267,"journal":{"name":"Ceramics International","volume":"50 23","pages":"Pages 49254-49262"},"PeriodicalIF":5.1,"publicationDate":"2024-09-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142664112","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}
{"title":"Corrigendum to “Improvement of in vitro osteogenesis and antimicrobial activity of injectable brushite for bone repair by incorporating with Se-loaded calcium phosphate” [Ceram. Int. 47 (2021) 11144–11155]","authors":"Zhengjun Pei, Zilin Zhang, Guangda Li, Fangfang Fu, Kaili Zhang, Yunbian Cai, Yunchuan Yang","doi":"10.1016/j.ceramint.2024.09.159","DOIUrl":"https://doi.org/10.1016/j.ceramint.2024.09.159","url":null,"abstract":"No Abstract","PeriodicalId":267,"journal":{"name":"Ceramics International","volume":"258 1","pages":""},"PeriodicalIF":5.2,"publicationDate":"2024-09-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142262604","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}
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