Pub Date : 2026-01-18DOI: 10.1016/j.jeurceramsoc.2026.118155
Lu Zhu , Nana Zhu , Pengju Tang , Baojing Zhang , Shengyuan Lei , Xiaohong Wang , Peizhong Feng
MoSi2‑based ceramics with superior high‑temperature nitridation resistance were developed through a dual strategy combining Al alloying and pre‑oxidation. A two-step route, self-propagating high-temperature synthesis followed by spark plasma sintering, was employed to prepare MoSi2 and Al-alloyed Mo(Si0.95Al0.05)2. Al incorporation and pre‑oxidation at 1500 °C produced dense Al–Si–O composite scales that merged the impermeability of SiO2 with the thermal stability of Al2O3. During direct nitridation at 1200 °C, the nitrogen diffusion coefficients of Mo(Si0.95Al0.05)2 decreased by 76% and 82% in the rapid (0–16 h) and slow (16–64 h) stages, and its overall mass change was much lower than that of MoSi2. Pre‑oxidation further enhanced protection, reducing diffusion coefficients to 0.005 and 0.001 mg/cm2·h0.5 compared with MoSi2 (0.007 and 0.004 mg/cm2·h0.5), due to the formation of stable Al–Si–O scales. Therefore, the pioneering dual strategy demonstrates a novel approach for developing advanced MoSi2-based ceramics with outstanding high-temperature nitridation resistance.
{"title":"Dual strategy to enhance the nitridation resistance of MoSi2-based ceramics for high-temperature applications","authors":"Lu Zhu , Nana Zhu , Pengju Tang , Baojing Zhang , Shengyuan Lei , Xiaohong Wang , Peizhong Feng","doi":"10.1016/j.jeurceramsoc.2026.118155","DOIUrl":"10.1016/j.jeurceramsoc.2026.118155","url":null,"abstract":"<div><div>MoSi<sub>2</sub>‑based ceramics with superior high‑temperature nitridation resistance were developed through a dual strategy combining Al alloying and pre‑oxidation. A two-step route, self-propagating high-temperature synthesis followed by spark plasma sintering, was employed to prepare MoSi<sub>2</sub> and Al-alloyed Mo(Si<sub>0.95</sub>Al<sub>0.05</sub>)<sub>2</sub>. Al incorporation and pre‑oxidation at 1500 °C produced dense Al–Si–O composite scales that merged the impermeability of SiO<sub>2</sub> with the thermal stability of Al<sub>2</sub>O<sub>3</sub>. During direct nitridation at 1200 °C, the nitrogen diffusion coefficients of Mo(Si<sub>0.95</sub>Al<sub>0.05</sub>)<sub>2</sub> decreased by 76% and 82% in the rapid (0–16 h) and slow (16–64 h) stages, and its overall mass change was much lower than that of MoSi<sub>2</sub>. Pre‑oxidation further enhanced protection, reducing diffusion coefficients to 0.005 and 0.001 mg/cm<sup>2</sup>·h<sup>0.5</sup> compared with MoSi<sub>2</sub> (0.007 and 0.004 mg/cm<sup>2</sup>·h<sup>0.5</sup>), due to the formation of stable Al–Si–O scales. Therefore, the pioneering dual strategy demonstrates a novel approach for developing advanced MoSi<sub>2</sub>-based ceramics with outstanding high-temperature nitridation resistance.</div></div>","PeriodicalId":17408,"journal":{"name":"Journal of The European Ceramic Society","volume":"46 8","pages":"Article 118155"},"PeriodicalIF":6.2,"publicationDate":"2026-01-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"146036913","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 : 2026-01-17DOI: 10.1016/j.jeurceramsoc.2026.118143
Jae-Min Cha , Cheol-Woo Ahn , Hyun-Ae Cha , Byung-Dong Hahn , Woon-Ha Yoon , Young Kook Moon , Seog-Young Yoon , Jong-Jin Choi
Textured Pb[(Mg0.5Ni0.5)1/3Nb2/3]O3-PbZrTiO3 (PMNN–PZT) piezoelectric ceramics were fabricated by the templated grain growth (TGG) method. Plate-like Ba(Zr0.1Ti0.9)O3 (BZT) templates were synthesized by topochemical molten salt synthesis (TMSS) and employed to promote grain orientation. Compared with conventional BaTiO3 (BT) templates, BZT templates exhibited lower reactivity with the matrix, resulting in a reduced tetragonal phase shift and a higher Lotgering factor after texturing. The phase composition of PMNN–PZT was further optimized to the morphotropic phase boundary (MPB) region by adjusting the Zr/Ti ratio. The textured ceramics thus obtained exhibited both a high piezoelectric charge coefficient (d₃₃ ∼ 610 pC/N) and a high mechanical quality factor (Qm ∼1145), overcoming the typical trade-off between these properties. These findings demonstrate that BZT templating is an effective strategy for tailoring phase composition and enhancing the electromechanical performance of textured piezoelectric ceramics.
{"title":"Giant piezoelectric properties in hard-type PMNN-PZT ceramics via templated grain growth using BZT templates","authors":"Jae-Min Cha , Cheol-Woo Ahn , Hyun-Ae Cha , Byung-Dong Hahn , Woon-Ha Yoon , Young Kook Moon , Seog-Young Yoon , Jong-Jin Choi","doi":"10.1016/j.jeurceramsoc.2026.118143","DOIUrl":"10.1016/j.jeurceramsoc.2026.118143","url":null,"abstract":"<div><div>Textured Pb[(Mg<sub>0.5</sub>Ni<sub>0.5</sub>)<sub>1/3</sub>Nb<sub>2/3</sub>]O<sub>3</sub>-PbZrTiO<sub>3</sub> (PMNN–PZT) piezoelectric ceramics were fabricated by the templated grain growth (TGG) method. Plate-like Ba(Zr<sub>0.1</sub>Ti<sub>0.9</sub>)O<sub>3</sub> (BZT) templates were synthesized by topochemical molten salt synthesis (TMSS) and employed to promote grain orientation. Compared with conventional BaTiO<sub>3</sub> (BT) templates, BZT templates exhibited lower reactivity with the matrix, resulting in a reduced tetragonal phase shift and a higher Lotgering factor after texturing. The phase composition of PMNN–PZT was further optimized to the morphotropic phase boundary (MPB) region by adjusting the Zr/Ti ratio. The textured ceramics thus obtained exhibited both a high piezoelectric charge coefficient (<em>d</em>₃₃ ∼ 610 pC/N) and a high mechanical quality factor (<em>Q</em><sub>m</sub> ∼1145), overcoming the typical trade-off between these properties. These findings demonstrate that BZT templating is an effective strategy for tailoring phase composition and enhancing the electromechanical performance of textured piezoelectric ceramics.</div></div>","PeriodicalId":17408,"journal":{"name":"Journal of The European Ceramic Society","volume":"46 8","pages":"Article 118143"},"PeriodicalIF":6.2,"publicationDate":"2026-01-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"146036558","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 : 2026-01-17DOI: 10.1016/j.jeurceramsoc.2026.118152
Ziqin Lin , Tianxia Xie , Zhuolin Xie , Anqi Dai , Yang Yuan , Peng Sun , Yanqi Song , Zhenggang Fang , Chunhua Lu
Solar absorbers are vital for concentrated solar power (CSP) systems, yet spectral selectivity solar absorbers (SSAs) struggle with high-temperature stability in air. This study introduced Mn ions into MgTiO3 (MTO) via a high temperature solid-phase synthesis technique to optimize the spectral selectivity. Unlike conventional doping that increased both absorptance and emittance, MgTi0.4Mn0.6O3 (MTMO-0.6) boosted solar absorptance (α = 0.85) while maintaining low emittance (ε = 0.39, 1073.15 K) in the 2.5–15 μm wavelength range. Besides, the material retained high spectral selectivity (α/ε = 0.84/0.41) after heat treatment at 800 °C in air atmosphere for 90 h in total (9 h cycles−1, 10 cycles), showing excellent thermal stability. Moreover, under concentrated solar irradiation of 10.83 W·cm−2, MTMO-0.6 sample reached an equilibrium temperature of 848 ℃, surpassing that of MTO and SiC. The proposed Mn-doped MgTiO3 has the potential as a solar absorber for high temperature solar thermal conversion.
{"title":"Enhancing the spectral selectivity of MgTiO3 via Mn doping for high temperature solar thermal conversion","authors":"Ziqin Lin , Tianxia Xie , Zhuolin Xie , Anqi Dai , Yang Yuan , Peng Sun , Yanqi Song , Zhenggang Fang , Chunhua Lu","doi":"10.1016/j.jeurceramsoc.2026.118152","DOIUrl":"10.1016/j.jeurceramsoc.2026.118152","url":null,"abstract":"<div><div>Solar absorbers are vital for concentrated solar power (CSP) systems, yet spectral selectivity solar absorbers (SSAs) struggle with high-temperature stability in air. This study introduced Mn ions into MgTiO<sub>3</sub> (MTO) via a high temperature solid-phase synthesis technique to optimize the spectral selectivity. Unlike conventional doping that increased both absorptance and emittance, MgTi<sub>0.4</sub>Mn<sub>0.6</sub>O<sub>3</sub> (MTMO-0.6) boosted solar absorptance (α = 0.85) while maintaining low emittance (ε = 0.39, 1073.15 K) in the 2.5–15 μm wavelength range. Besides, the material retained high spectral selectivity (α/ε = 0.84/0.41) after heat treatment at 800 °C in air atmosphere for 90 h in total (9 h cycles<sup>−1</sup>, 10 cycles), showing excellent thermal stability. Moreover, under concentrated solar irradiation of 10.83 W·cm<sup>−2</sup>, MTMO-0.6 sample reached an equilibrium temperature of 848 ℃, surpassing that of MTO and SiC. The proposed Mn-doped MgTiO<sub>3</sub> has the potential as a solar absorber for high temperature solar thermal conversion.</div></div>","PeriodicalId":17408,"journal":{"name":"Journal of The European Ceramic Society","volume":"46 8","pages":"Article 118152"},"PeriodicalIF":6.2,"publicationDate":"2026-01-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"146036911","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 : 2026-01-17DOI: 10.1016/j.jeurceramsoc.2026.118153
Haiyong Li , Hongquan Zhan , Pan Liu , Xuewen Han , Mengjun Liu , Rongting Pan , Chang-an Wang
This paper aims to address the preparation and structural coloring mechanism of an environmental-friendly gray glaze with photonic micro-nanostructure. Based on the results of XRD, SEM, TEM and EDS, it can be concluded that the special separated network structure with a FeZnTiO4-rich crystal phase and a Si-/Ca-rich glassy phase can be formed in glaze layer. Due to the introduction of Fe2O3, the separated crystal phase displays an urchin-like microstructure. Therefore, under the action of this photonic structure, the desirable gray glaze can be obtained. In addition, the gray glaze exhibits excellent optical property of angle-independency, overcoming the disadvantage of angular dependency of ordered photonic crystals. The more performances about stain resistance and corrosion resistance show its great potential application in daily use. This study provides a new idea for the development of environmental-friendly glazes by the design of photonic structures.
{"title":"Environmental-friendly gray glaze with photonic micro-nanostructure","authors":"Haiyong Li , Hongquan Zhan , Pan Liu , Xuewen Han , Mengjun Liu , Rongting Pan , Chang-an Wang","doi":"10.1016/j.jeurceramsoc.2026.118153","DOIUrl":"10.1016/j.jeurceramsoc.2026.118153","url":null,"abstract":"<div><div>This paper aims to address the preparation and structural coloring mechanism of an environmental-friendly gray glaze with photonic micro-nanostructure. Based on the results of XRD, SEM, TEM and EDS, it can be concluded that the special separated network structure with a FeZnTiO<sub>4</sub>-rich crystal phase and a Si-/Ca-rich glassy phase can be formed in glaze layer. Due to the introduction of Fe<sub>2</sub>O<sub>3</sub>, the separated crystal phase displays an urchin-like microstructure. Therefore, under the action of this photonic structure, the desirable gray glaze can be obtained. In addition, the gray glaze exhibits excellent optical property of angle-independency, overcoming the disadvantage of angular dependency of ordered photonic crystals. The more performances about stain resistance and corrosion resistance show its great potential application in daily use. This study provides a new idea for the development of environmental-friendly glazes by the design of photonic structures.</div></div>","PeriodicalId":17408,"journal":{"name":"Journal of The European Ceramic Society","volume":"46 8","pages":"Article 118153"},"PeriodicalIF":6.2,"publicationDate":"2026-01-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"146036570","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 : 2026-01-16DOI: 10.1016/j.jeurceramsoc.2026.118149
Tian Wang , Jingyi Hao , Lei Zhang , Min Chen , Yanna Cheng , Feng Yu , Jianfeng Li , Yiting Guo , Haixia Liu
BaTiO₃(BT)-based ferroelectric materials are pivotal for high-energy-density capacitors, However, their performance is limited by high remanent polarization and associated hysteresis losses. Traditional characterization methods often fail to resolve local polarization behaviors, which hinders the rational design of materials with enhanced energy storage properties. This review highlights the necessity and advancement of the First-Order Reversal Curve (FORC) technique. Based on the Preisach model, FORC analysis is effective in disentangling reversible and irreversible polarization contributions at the microstructural level. We systematically summarize its recent applications in BT-based ceramics, thin films, and multilayer ceramic capacitors (MLCCs), focusing on composition design, grain and domain engineering, defect control, and interface optimization. The FORC method offers insights into the relationships between dynamic domain switching and energy storage properties, thereby enabling targeted improvements in energy density and efficiency. This review underscores the critical role of FORC in guiding the development of next-generation ferroelectric energy storage devices.
{"title":"FORC applications in BaTiO₃-based ferroelectric materials and related capacitors","authors":"Tian Wang , Jingyi Hao , Lei Zhang , Min Chen , Yanna Cheng , Feng Yu , Jianfeng Li , Yiting Guo , Haixia Liu","doi":"10.1016/j.jeurceramsoc.2026.118149","DOIUrl":"10.1016/j.jeurceramsoc.2026.118149","url":null,"abstract":"<div><div>BaTiO₃(BT)-based ferroelectric materials are pivotal for high-energy-density capacitors, However, their performance is limited by high remanent polarization and associated hysteresis losses. Traditional characterization methods often fail to resolve local polarization behaviors, which hinders the rational design of materials with enhanced energy storage properties. This review highlights the necessity and advancement of the First-Order Reversal Curve (FORC) technique. Based on the Preisach model, FORC analysis is effective in disentangling reversible and irreversible polarization contributions at the microstructural level. We systematically summarize its recent applications in BT-based ceramics, thin films, and multilayer ceramic capacitors (MLCCs), focusing on composition design, grain and domain engineering, defect control, and interface optimization. The FORC method offers insights into the relationships between dynamic domain switching and energy storage properties, thereby enabling targeted improvements in energy density and efficiency. This review underscores the critical role of FORC in guiding the development of next-generation ferroelectric energy storage devices.</div></div>","PeriodicalId":17408,"journal":{"name":"Journal of The European Ceramic Society","volume":"46 8","pages":"Article 118149"},"PeriodicalIF":6.2,"publicationDate":"2026-01-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"146080446","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 : 2026-01-16DOI: 10.1016/j.jeurceramsoc.2026.118151
Hongru Jin, Ce Zheng, Yichun Bi, Zili Liu, Shengkai Wang, Xiaoqiang Li
Pyrochlore glass-ceramics are promising materials for nuclear waste immobilization, in which Zr⁴⁺ substitution for Ti⁴⁺ is known to enhance radiation resistance. However, high levels of Zr4 + substitution increase cation disorder, elevating the energy barrier for crystallization and posing synthesis challenge. In this study, the cation disorder in the pyrochlore structure was controlled by tuning the rA/rB ratio in Gd2-xLnxTi2-yZryO7 (LnNd, Dy, and Y) glass-ceramics. The results indicate that B-site Zr⁴⁺ substitution decreases the rA/rB ratio, leading to higher activation energy and impairing sinterability. In contrast, A-site Nd³⁺ substitution increases the rA/rB ratio, effectively mitigating these adverse effects and enabling sintering at lower temperatures. The phase composition was precisely regulated by the rA/rB ratio, progressing through four distinct stages: monoclinic, pyrochlore, coexisting pyrochlore/defect-fluorite, and defect-fluorite, showing a linear correlation between pyrochlore content and rA/rB. This work successfully demonstrates rA/rB regulation for fabricating advanced Zr4+-substituted glass-ceramic waste forms.
{"title":"Controlling sinterability and phase evolution in pyrochlore glass-ceramics via cationic radius ratio (rA/rB) for nuclear waste forms","authors":"Hongru Jin, Ce Zheng, Yichun Bi, Zili Liu, Shengkai Wang, Xiaoqiang Li","doi":"10.1016/j.jeurceramsoc.2026.118151","DOIUrl":"10.1016/j.jeurceramsoc.2026.118151","url":null,"abstract":"<div><div>Pyrochlore glass-ceramics are promising materials for nuclear waste immobilization, in which Zr⁴⁺ substitution for Ti⁴⁺ is known to enhance radiation resistance. However, high levels of Zr<sup>4 +</sup> substitution increase cation disorder, elevating the energy barrier for crystallization and posing synthesis challenge. In this study, the cation disorder in the pyrochlore structure was controlled by tuning the r<sub>A</sub>/r<sub>B</sub> ratio in Gd<sub>2-x</sub>Ln<sub>x</sub>Ti<sub>2-y</sub>Zr<sub>y</sub>O<sub>7</sub> (Ln<img>Nd, Dy, and Y) glass-ceramics. The results indicate that B-site Zr⁴⁺ substitution decreases the r<sub>A</sub>/r<sub>B</sub> ratio, leading to higher activation energy and impairing sinterability. In contrast, A-site Nd³⁺ substitution increases the r<sub>A</sub>/r<sub>B</sub> ratio, effectively mitigating these adverse effects and enabling sintering at lower temperatures. The phase composition was precisely regulated by the r<sub>A</sub>/r<sub>B</sub> ratio, progressing through four distinct stages: monoclinic, pyrochlore, coexisting pyrochlore/defect-fluorite, and defect-fluorite, showing a linear correlation between pyrochlore content and r<sub>A</sub>/r<sub>B</sub>. This work successfully demonstrates r<sub>A</sub>/r<sub>B</sub> regulation for fabricating advanced Zr<sup>4+</sup>-substituted glass-ceramic waste forms.</div></div>","PeriodicalId":17408,"journal":{"name":"Journal of The European Ceramic Society","volume":"46 8","pages":"Article 118151"},"PeriodicalIF":6.2,"publicationDate":"2026-01-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"146036912","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}
High-entropy oxides (HEOs) are promising for energy and structural applications, yet conventional synthesis routes yield powders that require multiple post-processing steps before use. This study demonstrates single-step fabrication of a transition-metal HEO coating via axial-fed solution precursor plasma spraying (SPPS) using equimolar Co-Cu-Mg-Ni-Zn nitrate hydrates. The resulting coatings are dense, adherent, and phase-pure, exhibiting a rock-salt structure confirmed by XRD, uniform cation distribution by SEM/EDS, and oxidized cations with oxygen-vacancy signatures by XPS. Comparative analysis of different spray conditions shows that phase purity and microstructure are governed by atomization and in-flight residence time, rather than plasma energy alone. The findings establish that suitable parameter control enables complete cation mixing and rapid in-flight phase formation without post-processing. This single-step route from solution to functional coatings provides a scalable pathway for HEO manufacture, with potential applications ranging from battery electrodes to high-temperature thermal and environmental barrier coatings (TBCs/EBCs) across different HEO families.
{"title":"Scalable single-step fabrication of high-entropy oxide coatings by axial solution precursor plasma spray","authors":"Gidla Vinay , Stefan Björklund , Ilari Angervo , Ashish Ganvir , Shrikant Joshi","doi":"10.1016/j.jeurceramsoc.2026.118150","DOIUrl":"10.1016/j.jeurceramsoc.2026.118150","url":null,"abstract":"<div><div>High-entropy oxides (HEOs) are promising for energy and structural applications, yet conventional synthesis routes yield powders that require multiple post-processing steps before use. This study demonstrates single-step fabrication of a transition-metal HEO coating via axial-fed solution precursor plasma spraying (SPPS) using equimolar Co-Cu-Mg-Ni-Zn nitrate hydrates. The resulting coatings are dense, adherent, and phase-pure, exhibiting a rock-salt structure confirmed by XRD, uniform cation distribution by SEM/EDS, and oxidized cations with oxygen-vacancy signatures by XPS. Comparative analysis of different spray conditions shows that phase purity and microstructure are governed by atomization and in-flight residence time, rather than plasma energy alone. The findings establish that suitable parameter control enables complete cation mixing and rapid in-flight phase formation without post-processing. This single-step route from solution to functional coatings provides a scalable pathway for HEO manufacture, with potential applications ranging from battery electrodes to high-temperature thermal and environmental barrier coatings (TBCs/EBCs) across different HEO families.</div></div>","PeriodicalId":17408,"journal":{"name":"Journal of The European Ceramic Society","volume":"46 8","pages":"Article 118150"},"PeriodicalIF":6.2,"publicationDate":"2026-01-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145986745","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 : 2026-01-15DOI: 10.1016/j.jeurceramsoc.2026.118147
Chengming Li , Lang Bian , Jianhui Jia , Shangpeng Yang , Kai Li , Pengrong Ren
The introduction of oxygen vacancies and defect dipoles to induce giant bending strain is a cutting-edge strategy to improve the performance of piezoelectric ceramics. However, its feasibility in a more widely used multi-layer structure is still unknown. In this study, it is found that the giant strain successfully achieved in single-layer ceramics almost disappeared in multi-layer ceramics based on the same material system. The system analysis shows that the internal mechanical clamping effect introduced by the multi-layer structure and the opposite bending direction between adjacent layers are the root causes of large strain failure. The conclusion of this study clearly points out that the excellent piezoelectric properties in unconstrained single-layer samples cannot be directly converted into the actual advantages of multi-layer devices. This finding provides a crucial application perspective correction for the current popular defect engineering research.
{"title":"Giant strain vanishes in multilayer ceramics: The limitation of defect-dipole engineering","authors":"Chengming Li , Lang Bian , Jianhui Jia , Shangpeng Yang , Kai Li , Pengrong Ren","doi":"10.1016/j.jeurceramsoc.2026.118147","DOIUrl":"10.1016/j.jeurceramsoc.2026.118147","url":null,"abstract":"<div><div>The introduction of oxygen vacancies and defect dipoles to induce giant bending strain is a cutting-edge strategy to improve the performance of piezoelectric ceramics. However, its feasibility in a more widely used multi-layer structure is still unknown. In this study, it is found that the giant strain successfully achieved in single-layer ceramics almost disappeared in multi-layer ceramics based on the same material system. The system analysis shows that the internal mechanical clamping effect introduced by the multi-layer structure and the opposite bending direction between adjacent layers are the root causes of large strain failure. The conclusion of this study clearly points out that the excellent piezoelectric properties in unconstrained single-layer samples cannot be directly converted into the actual advantages of multi-layer devices. This finding provides a crucial application perspective correction for the current popular defect engineering research.</div></div>","PeriodicalId":17408,"journal":{"name":"Journal of The European Ceramic Society","volume":"46 7","pages":"Article 118147"},"PeriodicalIF":6.2,"publicationDate":"2026-01-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"146034627","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 : 2026-01-13DOI: 10.1016/j.jeurceramsoc.2026.118146
Wenhao Li , Renhong Gan , Jiuhao You , Zhuoran Li , Xiaoyan Zhang
Hierarchically porous ceramics featuring aligned pores and pore walls assembled from hollow microspheres were fabricated via a novel processing route. Initially, pre-oxidized metallic aluminum solid microspheres were dispersed in a tert-butanol-based suspension, which was subsequently subjected to freeze casting and thermal treatment. This process resulted in the formation of oriented pores together with in situ generated hollow microspheres. The hierarchical pore structure consists of aligned channels (14.5 μm in diameter) produced by solvent sublimation, and closed pores (around 2.2 μm in diameter) formed through a Kirkendall-effect-driven hollowing transformation. The obtained porous ceramics exhibit favorable characteristics, including a sintering expansion of 2.80 %, high porosity, and enhanced compressive strength. By optimizing the sintering temperature and heating rate, porous alumina ceramics with a porosity of 67.8 % and a compressive strength of 64.75 MPa were achieved. These materials show promising potential for applications requiring lightweight structures without compromising mechanical performance.
{"title":"Porous alumina ceramics with integrated open and closed pores synthesized from thermal-oxidation of colloidal assembled aluminum particles via freeze casting","authors":"Wenhao Li , Renhong Gan , Jiuhao You , Zhuoran Li , Xiaoyan Zhang","doi":"10.1016/j.jeurceramsoc.2026.118146","DOIUrl":"10.1016/j.jeurceramsoc.2026.118146","url":null,"abstract":"<div><div>Hierarchically porous ceramics featuring aligned pores and pore walls assembled from hollow microspheres were fabricated via a novel processing route. Initially, pre-oxidized metallic aluminum solid microspheres were dispersed in a tert-butanol-based suspension, which was subsequently subjected to freeze casting and thermal treatment. This process resulted in the formation of oriented pores together with in situ generated hollow microspheres. The hierarchical pore structure consists of aligned channels (14.5 μm in diameter) produced by solvent sublimation, and closed pores (around 2.2 μm in diameter) formed through a Kirkendall-effect-driven hollowing transformation. The obtained porous ceramics exhibit favorable characteristics, including a sintering expansion of 2.80 %, high porosity, and enhanced compressive strength. By optimizing the sintering temperature and heating rate, porous alumina ceramics with a porosity of 67.8 % and a compressive strength of 64.75 MPa were achieved. These materials show promising potential for applications requiring lightweight structures without compromising mechanical performance.</div></div>","PeriodicalId":17408,"journal":{"name":"Journal of The European Ceramic Society","volume":"46 7","pages":"Article 118146"},"PeriodicalIF":6.2,"publicationDate":"2026-01-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145978565","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 : 2026-01-12DOI: 10.1016/j.jeurceramsoc.2026.118145
Qianqian Fan , Yanqin Fu , Fan Zhou , Junhao Zhao , Xue Li , Yuxin Li , Qingzhe Cui , Pei Wang , Yulei Zhang
Despite the improved ablation resistance offered by Hf-based ultra-high temperature ceramics (UHTCs) in carbon/carbon (C/C) composites, the porous oxide scales formed during ablation limits their long-term thermal stability, hindering advanced application. Herein, this work proposed the incorporation of Hf/Ti+Ta with varying molar ratios into C/C composites via reactive melt infiltration, and the resulting multi-component oxides after ablation promoted the formation of a dense oxide layer, thereby improving long-term ablation performance. The finding reveals that all samples were relatively dense and exhibited an identical layered structure around carbon fibers. Notably, the composites with a Hf/Ti/Ta molar ratio of 8:2:1 (8-HTT) exhibited superior ablation resistance, owing to the formation of a dense, adherent surface oxide layer, consisting of (Hf, Ti, Ta)O2 and HfTiO4. As the ablation duration increased to 240 s, the linear ablation rate for 8-HTT decreased to 0.7 μm/s, which was attributed to the self-healing effect enabled by low-melting-point oxide Hf6Ta2O17. This work establishes a theoretical foundation and optimization strategy for designing high-performance ablation-resistant C/C composites for extreme thermal environments.
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