Pub Date : 2024-10-28DOI: 10.1016/j.jeurceramsoc.2024.117029
Min Zeng , Lijie Wei , Jie Hu , Xi Zeng , Gen Li , Xianhui Zhang , Yongming Hu , Haoshang Gu , Yuebin Li
In this study, Pb2+-doped CsMnBr3 NCs are precipitated in borosilicate glass using a facile solid-phase process. The oxidation of Mn2+ to Mn3+ is effectively suppressed in the presence of modicum iron powder for the first time, resulting in a high transmittance of 80 % in the entire visible range and eliminating the reabsorption-induced energy loss for the CsMnBr3:Pb@glass composite. Owing to the enhanced absorption and weakened magnetic coupling between Mn−Mn pairs via Pb2+ ion doping, the optimum CsMnBr3:10 %Pb@glass emits intense orange-red light peaking at 645 nm with a record PLQY of 69.5 %, which is 5.4 times that of undoped counterpart. Furthermore, CsMnBr3:10 %Pb@glass demonstrates robust water and thermal-quenching resistances. Interestingly, the color of CsMnBr3@glass progressively changes from pink to cyan and green upon mechanical grinding with Pb2+ source, yielding a blueshift of the emission peak to 500 and 514 nm triggered by the phase transition of CsMnBr3 to CsPbBr3.
{"title":"Achieving high transparency and stable luminescence in CsMnBr3 nanocrystals embedded glass","authors":"Min Zeng , Lijie Wei , Jie Hu , Xi Zeng , Gen Li , Xianhui Zhang , Yongming Hu , Haoshang Gu , Yuebin Li","doi":"10.1016/j.jeurceramsoc.2024.117029","DOIUrl":"10.1016/j.jeurceramsoc.2024.117029","url":null,"abstract":"<div><div>In this study, Pb<sup>2+</sup>-doped CsMnBr<sub>3</sub> NCs are precipitated in borosilicate glass using a facile solid-phase process. The oxidation of Mn<sup>2+</sup> to Mn<sup>3+</sup> is effectively suppressed in the presence of modicum iron powder for the first time, resulting in a high transmittance of 80 % in the entire visible range and eliminating the reabsorption-induced energy loss for the CsMnBr<sub>3</sub>:Pb@glass composite. Owing to the enhanced absorption and weakened magnetic coupling between Mn−Mn pairs via Pb<sup>2+</sup> ion doping, the optimum CsMnBr<sub>3</sub>:10 %Pb@glass emits intense orange-red light peaking at 645 nm with a record PLQY of 69.5 %, which is 5.4 times that of undoped counterpart. Furthermore, CsMnBr<sub>3</sub>:10 %Pb@glass demonstrates robust water and thermal-quenching resistances. Interestingly, the color of CsMnBr<sub>3</sub>@glass progressively changes from pink to cyan and green upon mechanical grinding with Pb<sup>2+</sup> source, yielding a blueshift of the emission peak to 500 and 514 nm triggered by the phase transition of CsMnBr<sub>3</sub> to CsPbBr<sub>3</sub>.</div></div>","PeriodicalId":17408,"journal":{"name":"Journal of The European Ceramic Society","volume":"45 4","pages":"Article 117029"},"PeriodicalIF":5.8,"publicationDate":"2024-10-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142657693","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 : 2024-10-28DOI: 10.1016/j.jeurceramsoc.2024.117031
Aya Benjira , Guy Antou , Damien André , Denis Rochais , Thierry Piquero , Yohann Scaringella-Guerritat , Alexandre Maître
The consolidation and densification mechanisms occurring in the early sintering stages within a pure silica-based glassy material have been thoroughly investigated. Dilatometry curves were studied through several analytical approaches. In isothermal conditions at 1200°C, the identified m exponent value (correlating relative shrinkage to dwell time) is equal to 1.02 ± 0.08, which agrees with the analytical model of Coble for viscous flow sintering. Apparent activation energy and viscosity for sintering process were determined by applying the constant heating rate method and cyclic loading dilatometry respectively. The measured evolutions of specific surface area and relative density at the macroscale were correlated to microstructural features (i.e. pore size and interparticle neck radius). As shown, the silica material undergoes first a consolidation stage without significant shrinkage, before the occurrence of densification through particles coalescence. The shrinkage-neck growth trajectory characteristic of viscous flow sintering was established for this real glassy material, and compared to predictions of numerical models at the meso-scale from the literature.
我们对纯硅基玻璃材料烧结初期的固结和致密化机制进行了深入研究。通过几种分析方法对稀释曲线进行了研究。在 1200°C 等温条件下，确定的 m 指数值（相对收缩率与停留时间的相关性）等于 1.02 ± 0.08，这与 Coble 的粘性流动烧结分析模型一致。烧结过程的表观活化能和粘度分别是通过恒定加热速率法和循环加载扩张仪测定的。测量到的比表面积和相对密度在宏观尺度上的变化与微观结构特征（即孔径和颗粒间颈半径）相关联。如图所示，二氧化硅材料首先经历了没有明显收缩的固结阶段，然后通过颗粒凝聚发生致密化。为这种真实的玻璃质材料确定了粘性流动烧结的收缩-颈部生长轨迹，并与文献中介观尺度的数值模型预测进行了比较。
{"title":"In-depth characterization of the early sintering stages of an amorphous silica powder","authors":"Aya Benjira , Guy Antou , Damien André , Denis Rochais , Thierry Piquero , Yohann Scaringella-Guerritat , Alexandre Maître","doi":"10.1016/j.jeurceramsoc.2024.117031","DOIUrl":"10.1016/j.jeurceramsoc.2024.117031","url":null,"abstract":"<div><div>The consolidation and densification mechanisms occurring in the early sintering stages within a pure silica-based glassy material have been thoroughly investigated. Dilatometry curves were studied through several analytical approaches. In isothermal conditions at 1200°C, the identified <em>m</em> exponent value (correlating relative shrinkage to dwell time) is equal to 1.02 ± 0.08, which agrees with the analytical model of Coble for viscous flow sintering. Apparent activation energy and viscosity for sintering process were determined by applying the constant heating rate method and cyclic loading dilatometry respectively. The measured evolutions of specific surface area and relative density at the macroscale were correlated to microstructural features (<em>i.e.</em> pore size and interparticle neck radius). As shown, the silica material undergoes first a consolidation stage without significant shrinkage, before the occurrence of densification through particles coalescence. The shrinkage-neck growth trajectory characteristic of viscous flow sintering was established for this real glassy material, and compared to predictions of numerical models at the meso-scale from the literature.</div></div>","PeriodicalId":17408,"journal":{"name":"Journal of The European Ceramic Society","volume":"45 3","pages":"Article 117031"},"PeriodicalIF":5.8,"publicationDate":"2024-10-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142554144","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2024-10-26DOI: 10.1016/j.jeurceramsoc.2024.117027
Gang. Yan , Wei. Liu , Yu. Sun , Cong. Li , Li. Yang , Yi. Chun. Zhou
Three types of thermal barrier coatings (TBCs), YSZ, LZC/YSZ and GZO/YSZ, were deposited by EB-PVD. These coating systems were then subjected to thermal shock-CMAS corrosion testing using a high-temperature gas spray gun. The results demonstrate that the double-layer thermal barrier coatings exhibit excellent resistance to thermal shock-CMAS corrosion. Microstructural analysis revealed that the LZC/YSZ coating mitigated thermal damage owing to the formation of a sealing layer at the CMAS/LZC interface through high-temperature chemical interactions with CMAS. Compared to LZC/YSZ, the GZO/YSZ coatings showed greater resistance to CMAS-induced damage, which was associated with lower theoretical optical basicity values. This research provides valuable insights into the coupled thermal shock-CMAS corrosion failure mechanisms of TBCs on turbine blades and paves the way for new system-safe applications of TBCs.
{"title":"Failure behavior of RE2M2O7/YSZ TBCs prepared by EB-PVD in gas thermal shock-CMAS corrosion environment","authors":"Gang. Yan , Wei. Liu , Yu. Sun , Cong. Li , Li. Yang , Yi. Chun. Zhou","doi":"10.1016/j.jeurceramsoc.2024.117027","DOIUrl":"10.1016/j.jeurceramsoc.2024.117027","url":null,"abstract":"<div><div>Three types of thermal barrier coatings (TBCs), YSZ, LZC/YSZ and GZO/YSZ, were deposited by EB-PVD. These coating systems were then subjected to thermal shock-CMAS corrosion testing using a high-temperature gas spray gun. The results demonstrate that the double-layer thermal barrier coatings exhibit excellent resistance to thermal shock-CMAS corrosion. Microstructural analysis revealed that the LZC/YSZ coating mitigated thermal damage owing to the formation of a sealing layer at the CMAS/LZC interface through high-temperature chemical interactions with CMAS. Compared to LZC/YSZ, the GZO/YSZ coatings showed greater resistance to CMAS-induced damage, which was associated with lower theoretical optical basicity values. This research provides valuable insights into the coupled thermal shock-CMAS corrosion failure mechanisms of TBCs on turbine blades and paves the way for new system-safe applications of TBCs.</div></div>","PeriodicalId":17408,"journal":{"name":"Journal of The European Ceramic Society","volume":"45 3","pages":"Article 117027"},"PeriodicalIF":5.8,"publicationDate":"2024-10-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142539897","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 : 2024-10-25DOI: 10.1016/j.jeurceramsoc.2024.117024
Guangsheng Tu , Pengyu Xu , Bowen Chen , Ming Yang , Zhengyang Jing , Pan Gao , Bingtian Tu , Hao Wang , Weimin Wang , Zhengyi Fu
Reaction sintering of MgO and Ga2O3 powders was first used to prepare MgGa2O4 transparent ceramics. The microstructural evolution suggested that the negligible volume change resulting from the solid-phase reaction of MgO and Ga2O3, as well as the close and homogeneous arrangement of both fine particles, are the key factors in obtaining pre-sintered ceramics with an ideal microstructure at lower temperature. After a hot isostatic pressing (HIP) treatment, the fully dense ceramic exhibited improved in-transmittance (74.7 %@600 nm, and 85.4 %@4401 nm) and quality factor (Q × f = 168,000 GHz). Due to the combination of high transparency, wide transmission range (6.22 μm at the 60 % transmittance), ultra-low dielectric loss, and near-zero temperature coefficient of resonance frequency (− 3.9 ppm/°C), transparent MgGa2O4 ceramic is suggested to be an ideal optical-dielectric integration material.
{"title":"Reaction-sintered highly transparent MgGa2O4 ceramics with enhanced dielectric properties","authors":"Guangsheng Tu , Pengyu Xu , Bowen Chen , Ming Yang , Zhengyang Jing , Pan Gao , Bingtian Tu , Hao Wang , Weimin Wang , Zhengyi Fu","doi":"10.1016/j.jeurceramsoc.2024.117024","DOIUrl":"10.1016/j.jeurceramsoc.2024.117024","url":null,"abstract":"<div><div>Reaction sintering of MgO and Ga<sub>2</sub>O<sub>3</sub> powders was first used to prepare MgGa<sub>2</sub>O<sub>4</sub> transparent ceramics. The microstructural evolution suggested that the negligible volume change resulting from the solid-phase reaction of MgO and Ga<sub>2</sub>O<sub>3</sub>, as well as the close and homogeneous arrangement of both fine particles, are the key factors in obtaining pre-sintered ceramics with an ideal microstructure at lower temperature. After a hot isostatic pressing (HIP) treatment, the fully dense ceramic exhibited improved in-transmittance (74.7 %@600 nm, and 85.4 %@4401 nm) and quality factor (<em>Q</em> × <em>f</em> = 168,000 GHz). Due to the combination of high transparency, wide transmission range (6.22 μm at the 60 % transmittance), ultra-low dielectric loss, and near-zero temperature coefficient of resonance frequency (− 3.9 ppm/°C), transparent MgGa<sub>2</sub>O<sub>4</sub> ceramic is suggested to be an ideal optical-dielectric integration material.</div></div>","PeriodicalId":17408,"journal":{"name":"Journal of The European Ceramic Society","volume":"45 3","pages":"Article 117024"},"PeriodicalIF":5.8,"publicationDate":"2024-10-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142539899","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 : 2024-10-25DOI: 10.1016/j.jeurceramsoc.2024.117022
Chun Liu , Yunwu Tang , Chaoyi Ding , Wenhao Li , Weimin Wang
Tantalum carbide (TaC) powder was synthesised at 1500 ºC by sol-gel and carbothermal reduction processes using tantalum pentachloride (TaCl5) and phenolic resin as the starting materials. The effects of the C/Ta ratios in the Ta-containing precursor on the reaction yield, microstructure, chemical composition, and sinterability of the powders were investigated. The results showed that a high C/Ta ratio was favourable for the formation of TaC powder. With an increase in the C/Ta ratio, the oxygen content of the powder decreased, whereas the free carbon content increased. Consolidated TaC ceramics with high relative density (> 97 %) were obtained at 1900 ºC for 5 min under 80 MPa after sintering the powder synthesised at C/Ta ratios of 4.00 and above. However, the hardness and fracture toughness of the TaC ceramics were slightly reduced when the C/Ta ratio exceeded 4.00, owing to weak interface bonding caused by excessive free carbon in the powder. It was found that sintering TaC powders prepared at a C/Ta ratio of 4.00 produced dense TaC ceramics, with a Vickers hardness and fracture toughness of 16.54 GPa and 3.72 GPa∙m1/2, respectively.
{"title":"Effects of carbon on the synthesis and densification of tantalum carbide powder","authors":"Chun Liu , Yunwu Tang , Chaoyi Ding , Wenhao Li , Weimin Wang","doi":"10.1016/j.jeurceramsoc.2024.117022","DOIUrl":"10.1016/j.jeurceramsoc.2024.117022","url":null,"abstract":"<div><div>Tantalum carbide (TaC) powder was synthesised at 1500 ºC by sol-gel and carbothermal reduction processes using tantalum pentachloride (TaCl<sub>5</sub>) and phenolic resin as the starting materials. The effects of the C/Ta ratios in the Ta-containing precursor on the reaction yield, microstructure, chemical composition, and sinterability of the powders were investigated. The results showed that a high C/Ta ratio was favourable for the formation of TaC powder. With an increase in the C/Ta ratio, the oxygen content of the powder decreased, whereas the free carbon content increased. Consolidated TaC ceramics with high relative density (> 97 %) were obtained at 1900 ºC for 5 min under 80 MPa after sintering the powder synthesised at C/Ta ratios of 4.00 and above. However, the hardness and fracture toughness of the TaC ceramics were slightly reduced when the C/Ta ratio exceeded 4.00, owing to weak interface bonding caused by excessive free carbon in the powder. It was found that sintering TaC powders prepared at a C/Ta ratio of 4.00 produced dense TaC ceramics, with a Vickers hardness and fracture toughness of 16.54 GPa and 3.72 GPa∙m<sup>1/2</sup>, respectively.</div></div>","PeriodicalId":17408,"journal":{"name":"Journal of The European Ceramic Society","volume":"45 3","pages":"Article 117022"},"PeriodicalIF":5.8,"publicationDate":"2024-10-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142554021","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 : 2024-10-25DOI: 10.1016/j.jeurceramsoc.2024.117023
Kazuaki Hashimoto , Masashi Baba , Hirobumi Shibata , Katsumi Yoshida
Beta-tricalcium phosphate (β-TCP) ceramics were fabricated via reaction sintering at 1100 °C, utilizing various phosphate salts and calcium compounds as raw materials. The sintering characteristics, reaction sintering behavior and mechanical properties of the resulting β-TCP ceramics were investigated. Reaction sintering with a Ca/P molar ratio of 1.50 consistently generated β-TCP. In addition, a notable variance in physical properties was observed contingent on the presence or absence of stoichiometric hydroxyapatite (HAp; Ca10(PO4)6(OH)2) in raw materials. Sintered bodies produced with HAp−β-Ca2P2O7 (β-CPP), HAp− CaHPO4·2H2O (DCPD) and HAp−(NH4)2H(PO4) all exhibited densification and enhanced mechanical strength, correlated with higher bulk densities. In contrast, conventional sintered bodies prepared from β-TCP and reaction sintered bodies prepared using β-CPP−Ca(OH)2 or β-CPP−CaCO3 were not as dense. Comprehensive assessments by thermogravimetry-differential thermal analysis, X-ray diffraction and scanning electron microscope together with the evaluation of shrinkage behavior were used to monitor the sintering of β-TCP with HAp. This process was found to involve thermal decomposition of HAp and crystal transitions leading to the formation and sintering of β-TCP with significant shrinkage. These findings underscore the efficacy of employing HAp as a raw material in reaction sintering. This technique allows the formation of sintered β-TCP bodies exhibiting exceptional sintering characteristics, superior bulk density and high mechanical strength.
{"title":"Enhanced sinterability and mechanical strength of beta-type tricalcium phosphates ceramics through reaction sintering with hydroxyapatite","authors":"Kazuaki Hashimoto , Masashi Baba , Hirobumi Shibata , Katsumi Yoshida","doi":"10.1016/j.jeurceramsoc.2024.117023","DOIUrl":"10.1016/j.jeurceramsoc.2024.117023","url":null,"abstract":"<div><div>Beta-tricalcium phosphate (β-TCP) ceramics were fabricated via reaction sintering at 1100 °C, utilizing various phosphate salts and calcium compounds as raw materials. The sintering characteristics, reaction sintering behavior and mechanical properties of the resulting β-TCP ceramics were investigated. Reaction sintering with a Ca/P molar ratio of 1.50 consistently generated β-TCP. In addition, a notable variance in physical properties was observed contingent on the presence or absence of stoichiometric hydroxyapatite (HAp; Ca<sub>10</sub>(PO<sub>4</sub>)<sub>6</sub>(OH)<sub>2</sub>) in raw materials. Sintered bodies produced with HAp−β-Ca<sub>2</sub>P<sub>2</sub>O<sub>7</sub> (β-CPP), HAp− CaHPO<sub>4</sub>·2H<sub>2</sub>O (DCPD) and HAp−(NH<sub>4</sub>)<sub>2</sub>H(PO<sub>4</sub>) all exhibited densification and enhanced mechanical strength, correlated with higher bulk densities. In contrast, conventional sintered bodies prepared from β-TCP and reaction sintered bodies prepared using β-CPP−Ca(OH)<sub>2</sub> or β-CPP−CaCO<sub>3</sub> were not as dense. Comprehensive assessments by thermogravimetry-differential thermal analysis, X-ray diffraction and scanning electron microscope together with the evaluation of shrinkage behavior were used to monitor the sintering of β-TCP with HAp. This process was found to involve thermal decomposition of HAp and crystal transitions leading to the formation and sintering of β-TCP with significant shrinkage. These findings underscore the efficacy of employing HAp as a raw material in reaction sintering. This technique allows the formation of sintered β-TCP bodies exhibiting exceptional sintering characteristics, superior bulk density and high mechanical strength.</div></div>","PeriodicalId":17408,"journal":{"name":"Journal of The European Ceramic Society","volume":"45 4","pages":"Article 117023"},"PeriodicalIF":5.8,"publicationDate":"2024-10-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142657699","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2024-10-24DOI: 10.1016/j.jeurceramsoc.2024.117021
Yu Sun , Juan Liu , Tulai Sun , Zilong Yu , Ziyang Zheng , Mengru Ge , Lihong Bai
In this study, multiple rare earth elements were introduced to modify the multiferroic properties of BiFeO3. The effects of co-substitution on the structural evolution and properties were thoroughly investigated. With increasing substitution content, the ceramics underwent a symmetry transition from R3c to Pna21 and finally to Pbnm. Co-substitution significantly enhanced the ferroelectric properties, with the highest remanent polarization of 33.14 μC/cm² observed at x = 0.10. Due to the symmetry evolution, ferromagnetism was released from the cycloidal spin structure, and the hysteresis loop gradually saturated, with the highest remanent magnetization (Mr) of 0.25 emu/g observed at x = 0.16. The concurrent improvement in ferroelectricity and ferromagnetism resulted in substantial magnetoelectric coupling performance, with αME = 3.50 mV/(cm·Oe). Moreover, direct current poling significantly induced the reverse transition from R3c to Pna21, indicating the potential for electrically controlled magnetism. This study provides a new perspective for modifying the magnetoelectric properties of BiFeO3.
{"title":"Structural evolution and enhanced multiferroicity in BiFeO3-based ceramics via rare earth element co-substitution","authors":"Yu Sun , Juan Liu , Tulai Sun , Zilong Yu , Ziyang Zheng , Mengru Ge , Lihong Bai","doi":"10.1016/j.jeurceramsoc.2024.117021","DOIUrl":"10.1016/j.jeurceramsoc.2024.117021","url":null,"abstract":"<div><div>In this study, multiple rare earth elements were introduced to modify the multiferroic properties of BiFeO<sub>3</sub>. The effects of co-substitution on the structural evolution and properties were thoroughly investigated. With increasing substitution content, the ceramics underwent a symmetry transition from <em>R</em>3<em>c</em> to <em>Pna</em>2<sub>1</sub> and finally to <em>Pbnm</em>. Co-substitution significantly enhanced the ferroelectric properties, with the highest remanent polarization of 33.14 μC/cm² observed at <em>x</em> = 0.10. Due to the symmetry evolution, ferromagnetism was released from the cycloidal spin structure, and the hysteresis loop gradually saturated, with the highest remanent magnetization (<em>M</em><sub>r</sub>) of 0.25 emu/g observed at <em>x</em> = 0.16. The concurrent improvement in ferroelectricity and ferromagnetism resulted in substantial magnetoelectric coupling performance, with α<sub>ME</sub> = 3.50 mV/(cm·Oe). Moreover, direct current poling significantly induced the reverse transition from <em>R</em>3<em>c</em> to <em>Pna</em>2<sub>1</sub>, indicating the potential for electrically controlled magnetism. This study provides a new perspective for modifying the magnetoelectric properties of BiFeO<sub>3</sub>.</div></div>","PeriodicalId":17408,"journal":{"name":"Journal of The European Ceramic Society","volume":"45 3","pages":"Article 117021"},"PeriodicalIF":5.8,"publicationDate":"2024-10-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142527607","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 : 2024-10-24DOI: 10.1016/j.jeurceramsoc.2024.117017
Haoze Wu , Hongmei Li , Yu Wang , Peiling He , Zhimin Li , Qinglin Ma
Being an important source of primary celadon in ancient China, the Qiong kiln is one of the few kilns that can skillfully produce opaque glaze celadon, which is of great significance in the history of Chinese ceramics. In this study, the chemical composition, microstructure, and crystalline phase of sixteen pieces of opaque glaze celadon excavated from the site of Qiong kiln Shifangtang dated at the Tang Dynasty were investigated by using ultra depth of field microscopy, scanning electron microscopy, energy spectrometry, and micro confocal Raman spectrometry. The findings indicate that Fe is the predominant coloring element in the ceramic glaze, and Cu is sometimes a secondary coloring element. During porcelain firing, washed plant ash was used to increase the phosphorus content of the glaze, while some wares incorporated animal ashes as a flux to improve glaze emulsification.
{"title":"Was bone used in the glaze of the ancient Qiong kilns for the production of tang dynasty opaque glaze celadon?","authors":"Haoze Wu , Hongmei Li , Yu Wang , Peiling He , Zhimin Li , Qinglin Ma","doi":"10.1016/j.jeurceramsoc.2024.117017","DOIUrl":"10.1016/j.jeurceramsoc.2024.117017","url":null,"abstract":"<div><div>Being an important source of primary celadon in ancient China, the Qiong kiln is one of the few kilns that can skillfully produce opaque glaze celadon, which is of great significance in the history of Chinese ceramics. In this study, the chemical composition, microstructure, and crystalline phase of sixteen pieces of opaque glaze celadon excavated from the site of Qiong kiln Shifangtang dated at the Tang Dynasty were investigated by using ultra depth of field microscopy, scanning electron microscopy, energy spectrometry, and micro confocal Raman spectrometry. The findings indicate that Fe is the predominant coloring element in the ceramic glaze, and Cu is sometimes a secondary coloring element. During porcelain firing, washed plant ash was used to increase the phosphorus content of the glaze, while some wares incorporated animal ashes as a flux to improve glaze emulsification.</div></div>","PeriodicalId":17408,"journal":{"name":"Journal of The European Ceramic Society","volume":"45 3","pages":"Article 117017"},"PeriodicalIF":5.8,"publicationDate":"2024-10-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142554020","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 : 2024-10-23DOI: 10.1016/j.jeurceramsoc.2024.117015
Hao Yuan, Chun Li, Xiaoqing Si, Bo Yang, Mingshen Li, Yongxv Liu, Yunfei Cao, Jian Cao
The direct welding of alumina and zirconia ceramics by ultrashort pulse laser is presented for the first time. Compared to traditional dissimilar ceramic joining techniques such as brazing and diffusion welding, this method shows various advantages, including operation at room-temperature, higher welding efficiency, and negligible impact on base materials. The joint microstructure consists of a combination of Al2O3 and ZrO2 phases, without new phases detected. By adjusting the laser focal point position, the phase content within joint is effectively regulated, successfully preventing crack formation in alumina substrate. The influence of laser power and welding speed on joint morphology and mechanical property is fully investigated. The highest four-point bending strength of 365.5 MPa and shear strength of 33.4 MPa are achieved. After experiencing thermal cycling test at 1000°C, the joint strength and microstructure does not exhibit significant changes, demonstrating the excellent high-temperature durability of the sample.
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Pub Date : 2024-10-22DOI: 10.1016/j.jeurceramsoc.2024.116994
Xingyuan Zhao , Maxim Sokol , Michel W. Barsoum , Leslie Lamberson
MAX phases are distinguished by their unique kink band formation, a distinct deformation mechanism in layered materials. This study explores the influence of global grain orientation c-axis, strain rate, and stress state on the compressive response of highly oriented Ti3SiC2 through experimental methods. A Kolsky (or split-Hopkinson) bar is employed to evaluate the dynamic compressive response under uniaxial and biaxial (planar confinement) conditions under 102 s−1 strain rate. Macroscopic ultra-high-speed visualization during loading and microscopic post-mortem fractography reveal that confinement states significantly impact both macroscopic failure patterns and microscopic fracture mechanisms. Notably, biaxial loading with dynamic load edge-on to the grains and 80 MPa planar confinement along the layers resulted in the highest dynamic compressive strength observed (1636 ± 136 MPa), a 66 % increase compared to the unconfined uniaxial dynamic condition. The planar confinement appears to delay crack propagation and enhance inelastic deformation.
MAX 相因其独特的扭结带形成而与众不同，这是层状材料中一种独特的变形机制。本研究通过实验方法探讨了全局晶粒取向 c 轴、应变速率和应力状态对高取向 Ti3SiC2 压缩响应的影响。在 102 s-1 应变速率下，采用 Kolsky（或 split-Hopkinson）棒评估单轴和双轴（平面约束）条件下的动态压缩响应。加载过程中的宏观超高速可视化和死后的微观断裂图显示，约束状态对宏观破坏模式和微观断裂机制都有显著影响。值得注意的是，在晶粒边缘施加动态载荷和沿层施加 80 兆帕平面约束的双轴加载条件下，观察到的动态抗压强度最高（1636 ± 136 兆帕），与非约束单轴动态条件相比提高了 66%。平面约束似乎能延缓裂纹扩展并增强非弹性变形。
{"title":"Dynamic strength and fragmentation of highly oriented Ti3SiC2 under multiaxial compression","authors":"Xingyuan Zhao , Maxim Sokol , Michel W. Barsoum , Leslie Lamberson","doi":"10.1016/j.jeurceramsoc.2024.116994","DOIUrl":"10.1016/j.jeurceramsoc.2024.116994","url":null,"abstract":"<div><div>MAX phases are distinguished by their unique kink band formation, a distinct deformation mechanism in layered materials. This study explores the influence of global grain orientation c-axis, strain rate, and stress state on the compressive response of highly oriented Ti<sub>3</sub>SiC<sub>2</sub> through experimental methods. A Kolsky (or split-Hopkinson) bar is employed to evaluate the dynamic compressive response under uniaxial and biaxial (planar confinement) conditions under 10<sup>2</sup> s<sup>−1</sup> strain rate. Macroscopic ultra-high-speed visualization during loading and microscopic post-mortem fractography reveal that confinement states significantly impact both macroscopic failure patterns and microscopic fracture mechanisms. Notably, biaxial loading with dynamic load edge-on to the grains and 80 MPa planar confinement along the layers resulted in the highest dynamic compressive strength observed (1636 ± 136 MPa), a 66 % increase compared to the unconfined uniaxial dynamic condition. The planar confinement appears to delay crack propagation and enhance inelastic deformation.</div></div>","PeriodicalId":17408,"journal":{"name":"Journal of The European Ceramic Society","volume":"45 3","pages":"Article 116994"},"PeriodicalIF":5.8,"publicationDate":"2024-10-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142577800","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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