Pub Date : 2026-08-01Epub Date: 2026-01-26DOI: 10.1016/j.jeurceramsoc.2026.118176
Rui Zhao , Chao Ma , Hongtian He , Daoyang Han , Hongxia Lu , Hongliang Xu , Hailong Wang , Rui Zhang , Linan An , Gang Shao
The inherently strong covalent and ionic bonds of ceramics severely limit their plastic formability at low temperatures, which restricts their wide applications in complex-shaped components. In this study, we demonstrate a flash-activated deep drawing approach that enables ultrafast plastic forming of 3 mol% yttria-stabilized zirconia at a low furnace temperature of 800 °C and a high forming speed of 8 mm/min, which represents a substantial improvement over the extreme conditions typically required in conventional ceramic forming (1450–1750 °C, ˂0.6 mm/min) and other field-assisted forming studies (1400–1600 °C, ∼ 0.1 mm/min). Furthermore, region-specific forming experiments indicate that the anode and middle regions of the sample show better formability than the cathode region, owing to higher local temperatures and fewer vacancy-related defects. The abundant dislocations suggest that deformation is governed by dislocation-accommodated grain-boundary sliding, with electric field/current-enhanced diffusion further promoting grain-boundary accommodation and acting synergistically with dislocation activity.
{"title":"Flash-activated low-temperature ultrafast shaping of ZrO2 ceramics","authors":"Rui Zhao , Chao Ma , Hongtian He , Daoyang Han , Hongxia Lu , Hongliang Xu , Hailong Wang , Rui Zhang , Linan An , Gang Shao","doi":"10.1016/j.jeurceramsoc.2026.118176","DOIUrl":"10.1016/j.jeurceramsoc.2026.118176","url":null,"abstract":"<div><div>The inherently strong covalent and ionic bonds of ceramics severely limit their plastic formability at low temperatures, which restricts their wide applications in complex-shaped components. In this study, we demonstrate a flash-activated deep drawing approach that enables ultrafast plastic forming of 3 mol% yttria-stabilized zirconia at a low furnace temperature of 800 °C and a high forming speed of 8 mm/min, which represents a substantial improvement over the extreme conditions typically required in conventional ceramic forming (1450–1750 °C, ˂0.6 mm/min) and other field-assisted forming studies (1400–1600 °C, ∼ 0.1 mm/min). Furthermore, region-specific forming experiments indicate that the anode and middle regions of the sample show better formability than the cathode region, owing to higher local temperatures and fewer vacancy-related defects. The abundant dislocations suggest that deformation is governed by dislocation-accommodated grain-boundary sliding, with electric field/current-enhanced diffusion further promoting grain-boundary accommodation and acting synergistically with dislocation activity.</div></div>","PeriodicalId":17408,"journal":{"name":"Journal of The European Ceramic Society","volume":"46 9","pages":"Article 118176"},"PeriodicalIF":6.2,"publicationDate":"2026-08-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"146191583","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 : 2026-08-01Epub Date: 2026-02-11DOI: 10.1016/j.jeurceramsoc.2026.118230
Hao Chen , Hong Liu , Jie Yin , Voon-Kean Wong , David Boon Kiang Lim , Chao Jiang , Jie Xing , Kui Yao , Jianguo Zhu
Pb(Mg1/3Nb2/3)O3-Pb(Zr0.41Ti0.59)O3 is a perovskite material system with superior piezoelectric properties. Here, with optimized Nd ions introduced as soft dopants into the A-site of the lattice, the piezoelectric constant (d33) was significantly enhanced from 318 pC/N to 825 pC/N. Microstructural characterization and electrical property measurements revealed that the outstanding piezoelectric performance primarily originated from the formation of polar nanoregions (PNRs) induced by the synergistic regulation of phase structure and relaxor characteristics. The presence of PNRs was further confirmed by the observation of Moiré fringes using transmission electron microscopy. The activation energy analysis indicated that Nd-doped PNRs significantly facilitate domain switching, thereby improving piezoelectric properties. As a demonstration of the practical value of the improved piezoelectric properties, the PMNZT-xNd ceramic exhibits enhanced ultrasonic structural health monitoring performance, identifying defects to a depth of 0.06 mm in ultrasonic detection experiments.
{"title":"Enhancing piezoelectric properties of PZT-based ceramics for ultrasonic device application via Nd-doping and modulating polar nanoregions","authors":"Hao Chen , Hong Liu , Jie Yin , Voon-Kean Wong , David Boon Kiang Lim , Chao Jiang , Jie Xing , Kui Yao , Jianguo Zhu","doi":"10.1016/j.jeurceramsoc.2026.118230","DOIUrl":"10.1016/j.jeurceramsoc.2026.118230","url":null,"abstract":"<div><div>Pb(Mg1/3Nb2/3)O<sub>3</sub>-Pb(Zr<sub>0.41</sub>Ti<sub>0.59</sub>)O<sub>3</sub> is a perovskite material system with superior piezoelectric properties. Here, with optimized Nd ions introduced as soft dopants into the A-site of the lattice, the piezoelectric constant (<em>d</em><sub>33</sub>) was significantly enhanced from 318 pC/N to 825 pC/N. Microstructural characterization and electrical property measurements revealed that the outstanding piezoelectric performance primarily originated from the formation of polar nanoregions (PNRs) induced by the synergistic regulation of phase structure and relaxor characteristics. The presence of PNRs was further confirmed by the observation of Moiré fringes using transmission electron microscopy. The activation energy analysis indicated that Nd-doped PNRs significantly facilitate domain switching, thereby improving piezoelectric properties. As a demonstration of the practical value of the improved piezoelectric properties, the PMNZT-<em>x</em>Nd ceramic exhibits enhanced ultrasonic structural health monitoring performance, identifying defects to a depth of 0.06 mm in ultrasonic detection experiments.</div></div>","PeriodicalId":17408,"journal":{"name":"Journal of The European Ceramic Society","volume":"46 9","pages":"Article 118230"},"PeriodicalIF":6.2,"publicationDate":"2026-08-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"146191586","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 work, the influence of aliovalent doping with Al3 + and Ta5+ cations on the structure and thermal properties of La2Zr2O7 (LZO) was investigated and the solubility of Al3+ and Ta5+ in LZO separately and jointly was studied for the first time. The samples were synthesized by mechanochemical activation followed by sintering at 1200 °C and 1500 °C. It was established that doping maintains the pyrochlore-type structure (space group Fdm) within observed solubility limits (Al3+ up to x ≈ 0.12 and Ta5+ up to y ≈ 0.48). While the CTE of pure LZO increases with temperature (from 7.97 at 25°C to 11.50 ×10⁻⁶ °C⁻¹ at 1300°C), co-doping with Al3+ and Ta5+, specifically for the La1.96Al0.09Ta0.25Zr1.7O7.075 composition, resulted in a remarkably stable CTE (from 9.09 at 25°C to 9.82 ×10⁻⁶ °C⁻¹ at 1300°C) over a wide temperature range, a critical factor for thermal barrier coatings.
{"title":"Aliovalent doping of La2Zr2O7 with Al³ ⁺ and Ta⁵⁺ for CTE tuning","authors":"A.B. Kuznetsov , S.F. Solodovnikov , D. Sagatova , A.O. Klimov , P.A. Abramov , K.A. Kokh","doi":"10.1016/j.jeurceramsoc.2026.118215","DOIUrl":"10.1016/j.jeurceramsoc.2026.118215","url":null,"abstract":"<div><div>In this work, the influence of aliovalent doping with Al<sup>3 +</sup> and Ta<sup>5+</sup> cations on the structure and thermal properties of La<sub>2</sub>Zr<sub>2</sub>O<sub>7</sub> (LZO) was investigated and the solubility of Al<sup>3+</sup> and Ta<sup>5+</sup> in LZO separately and jointly was studied for the first time. The samples were synthesized by mechanochemical activation followed by sintering at 1200 °C and 1500 °C. It was established that doping maintains the pyrochlore-type structure (space group <em>Fd</em> <span><math><mover><mn>3</mn><mo>¯</mo></mover></math></span><em>m</em>) within observed solubility limits (Al<sup>3+</sup> up to <em>x</em> ≈ 0.12 and Ta<sup>5+</sup> up to <em>y</em> ≈ 0.48). While the CTE of pure LZO increases with temperature (from 7.97 at 25°C to 11.50 ×10⁻⁶ °C⁻¹ at 1300°C), co-doping with Al<sup>3+</sup> and Ta<sup>5+</sup>, specifically for the La<sub>1.96</sub>Al<sub>0.09</sub>Ta<sub>0.25</sub>Zr<sub>1.7</sub>O<sub>7.075</sub> composition, resulted in a remarkably stable CTE (from 9.09 at 25°C to 9.82 ×10⁻⁶ °C⁻¹ at 1300°C) over a wide temperature range, a critical factor for thermal barrier coatings.</div></div>","PeriodicalId":17408,"journal":{"name":"Journal of The European Ceramic Society","volume":"46 9","pages":"Article 118215"},"PeriodicalIF":6.2,"publicationDate":"2026-08-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"146191686","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 : 2026-08-01Epub Date: 2026-02-02DOI: 10.1016/j.jeurceramsoc.2026.118204
Siyuan Wang , Wei Cai , WenJin Wu , Huasong Liu , Jianwei Zheng , Liang Qiao , Yao Ying , Juan Li , Jing Yu , Naoki Wakiya , Jingwu Zheng , Shenglei Che
Cold sintering, characterized by low temperature, low energy consumption, and environmental friendliness, offers a promising route for sintering SrFe12O19. This study systematically investigates the effects of transient solvent composition, sintering temperature, and powder morphology on the densification mechanism of SrFe12O19. In the acetic acid–ethanol transient solvent system, Fe3 + ions preferentially dissolved and reacted with acetate and hydroxyl groups to form iron–carboxylate species, which facilitated particle bonding and densification. However, increased solvent concentration and cold sintering temperature cause its decomposition into Fe2O3, and gas release; trapped gas forms pores that impede densification, leading to reduced densification at higher temperatures. Meanwhile, irregular powders promote the “dissolution–precipitation” process more effectively than spherical ones. Under optimized conditions, 16 mol/L transient solvent concentration, 40 wt% addition, 250 °C sintering temperature, 1 GPa pressure, and 3 h holding time, the ball-milled powder achieved a optimal combined magnetic properties (Hcj = 5.31 kOe, Ms = 60.39 emu/g).
{"title":"Mechanistic elucidation of cold sintering behavior in SrFe12O19 ceramics: Role of transient solvent, temperature, and particle morphology","authors":"Siyuan Wang , Wei Cai , WenJin Wu , Huasong Liu , Jianwei Zheng , Liang Qiao , Yao Ying , Juan Li , Jing Yu , Naoki Wakiya , Jingwu Zheng , Shenglei Che","doi":"10.1016/j.jeurceramsoc.2026.118204","DOIUrl":"10.1016/j.jeurceramsoc.2026.118204","url":null,"abstract":"<div><div>Cold sintering, characterized by low temperature, low energy consumption, and environmental friendliness, offers a promising route for sintering SrFe<sub>12</sub>O<sub>19</sub>. This study systematically investigates the effects of transient solvent composition, sintering temperature, and powder morphology on the densification mechanism of SrFe<sub>12</sub>O<sub>19</sub>. In the acetic acid–ethanol transient solvent system, Fe<sup>3 +</sup> ions preferentially dissolved and reacted with acetate and hydroxyl groups to form iron–carboxylate species, which facilitated particle bonding and densification. However, increased solvent concentration and cold sintering temperature cause its decomposition into Fe<sub>2</sub>O<sub>3</sub>, and gas release; trapped gas forms pores that impede densification, leading to reduced densification at higher temperatures. Meanwhile, irregular powders promote the “dissolution–precipitation” process more effectively than spherical ones. Under optimized conditions, 16 mol/L transient solvent concentration, 40 wt% addition, 250 °C sintering temperature, 1 GPa pressure, and 3 h holding time, the ball-milled powder achieved a optimal combined magnetic properties (<em>H</em><sub><em>cj</em></sub> = 5.31 kOe, <em>M</em><sub><em>s</em></sub> = 60.39 emu/g).</div></div>","PeriodicalId":17408,"journal":{"name":"Journal of The European Ceramic Society","volume":"46 9","pages":"Article 118204"},"PeriodicalIF":6.2,"publicationDate":"2026-08-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"146098721","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}
Shape memory materials (SMMs) enable strain recovery after deformation. Ferroelectric ceramics, such as BaTiO3 (BTO), can also demonstrate the shape memory effect (SME) through a ferroelectric-paraelectric transformation. While grain size (GS) is known to significantly influence SME in shape memory alloys (SMAs), its role in shape memory ceramics (SMCs) remains unexplored. In this work, BTO ceramics with GS ranging from 49 μm to 0.54 μm were prepared via a two-step sintering method to investigate the GS effect on SME. Results reveal that decreasing GS significantly enhances the residual strain, with the maximum residual strain increasing by approximately 3 times from 0.05 % (coarse grains, 49 μm) to 0.15 % (fine grains, 0.54 μm). This improvement is attributed to the increased number of 90° domains in smaller GS BTO ceramics. Additionally, external stress applied during cooling leads to a linear increase in residual strain. This phenomenon is explained from an energy perspective. Stress raises the system's strain energy, which encourages the formation of more 90° domains and fewer 180° domains as BTO transitions to the tetragonal phase. This work provides critical insights into enhancing SME in ferroelectric ceramics by controlling GS and domain structure, offering a potential strategy to tailor SME in SMCs.
{"title":"Grain size effect on the shape memory effect of BaTiO3","authors":"Xiongxin Guo, Baoju Xia, Xinnan Shi, Xinrong Yang, Yagang Qi, Baojin Chu","doi":"10.1016/j.jeurceramsoc.2026.118229","DOIUrl":"10.1016/j.jeurceramsoc.2026.118229","url":null,"abstract":"<div><div>Shape memory materials (SMMs) enable strain recovery after deformation. Ferroelectric ceramics, such as BaTiO<sub>3</sub> (BTO), can also demonstrate the shape memory effect (SME) through a ferroelectric-paraelectric transformation. While grain size (GS) is known to significantly influence SME in shape memory alloys (SMAs), its role in shape memory ceramics (SMCs) remains unexplored. In this work, BTO ceramics with GS ranging from 49 μm to 0.54 μm were prepared via a two-step sintering method to investigate the GS effect on SME. Results reveal that decreasing GS significantly enhances the residual strain, with the maximum residual strain increasing by approximately 3 times from 0.05 % (coarse grains, 49 μm) to 0.15 % (fine grains, 0.54 μm). This improvement is attributed to the increased number of 90° domains in smaller GS BTO ceramics. Additionally, external stress applied during cooling leads to a linear increase in residual strain. This phenomenon is explained from an energy perspective. Stress raises the system's strain energy, which encourages the formation of more 90° domains and fewer 180° domains as BTO transitions to the tetragonal phase. This work provides critical insights into enhancing SME in ferroelectric ceramics by controlling GS and domain structure, offering a potential strategy to tailor SME in SMCs.</div></div>","PeriodicalId":17408,"journal":{"name":"Journal of The European Ceramic Society","volume":"46 9","pages":"Article 118229"},"PeriodicalIF":6.2,"publicationDate":"2026-08-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"146191588","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 : 2026-08-01Epub Date: 2026-02-06DOI: 10.1016/j.jeurceramsoc.2026.118218
Lu Sun , Ziyang Ma , Zhenfei Cai , Kai Li , Yuxin Lin , Qinyu Wu , Yanan Chen , Shimiao Chen , Junzhe Li , Muhammad Moin , Yangzhou Ma , Guangsheng Song
Li1.2Mn0.54Co0.13Ni0.13O2 (Li-rich Mn-based layered oxide) exhibits a high theoretical specific capacity, high operating voltage, and low cost, making it a promising candidate for next-generation cathodes in high-energy-density lithium-ion batteries. This study synthesized the cathode material coated with discontinuous ZrO2 nanoparticles via a co-precipitation method. Results demonstrate that the discontinuous ZrO2 nanoparticle coating significantly influences the electrochemical properties of Li1.2Mn0.54Co0.13Ni0.13O2. The optimal electrochemical performance, achieved with a 1.0 wt% ZrO2 discontinuous coating, delivered an initial discharge capacity of 196mAh g−1 and a capacity of 170.5mAh g−1 after 200 cycles at 1 C, corresponding to a high retention rate of 86.8 %. Furthermore, the discontinuous coating forms an intermittent protective layer while leaving substantial surface areas exposed. This morphology facilitates smoother and more numerous lithium-ion transport pathways, thereby maintaining high ionic conductivity and enhancing the cathode's electrochemical performance.
Li1.2Mn0.54Co0.13Ni0.13O2（富锂锰基层状氧化物）具有理论比容量高、工作电压高、成本低的特点，是高能量密度锂离子电池下一代阴极的理想材料。本研究采用共沉淀法合成了不连续ZrO2纳米颗粒包覆的正极材料。结果表明，不连续的ZrO2纳米颗粒涂层对Li1.2Mn0.54Co0.13Ni0.13O2的电化学性能有显著影响。在1.0 wt%的ZrO2不连续涂层中获得了最佳的电化学性能，在1 C下进行200次循环后，初始放电容量为196mAh g - 1，放电容量为170.5mAh g - 1，相应的保留率高达86.8% %。此外，不连续的涂层在留下大量暴露的表面区域的同时形成间歇性保护层。这种形态有利于更平滑和更多的锂离子传输路径，从而保持高离子电导率，提高阴极的电化学性能。
{"title":"Enhancing a high-energy Li-rich cathode for Li-ion batteries via discontinuous ZrO2 coating","authors":"Lu Sun , Ziyang Ma , Zhenfei Cai , Kai Li , Yuxin Lin , Qinyu Wu , Yanan Chen , Shimiao Chen , Junzhe Li , Muhammad Moin , Yangzhou Ma , Guangsheng Song","doi":"10.1016/j.jeurceramsoc.2026.118218","DOIUrl":"10.1016/j.jeurceramsoc.2026.118218","url":null,"abstract":"<div><div>Li<sub>1.2</sub>Mn<sub>0.54</sub>Co<sub>0.13</sub>Ni<sub>0.13</sub>O<sub>2</sub> (Li-rich Mn-based layered oxide) exhibits a high theoretical specific capacity, high operating voltage, and low cost, making it a promising candidate for next-generation cathodes in high-energy-density lithium-ion batteries. This study synthesized the cathode material coated with discontinuous ZrO<sub>2</sub> nanoparticles via a co-precipitation method. Results demonstrate that the discontinuous ZrO<sub>2</sub> nanoparticle coating significantly influences the electrochemical properties of Li<sub>1.2</sub>Mn<sub>0.54</sub>Co<sub>0.13</sub>Ni<sub>0.13</sub>O<sub>2</sub>. The optimal electrochemical performance, achieved with a 1.0 wt% ZrO<sub>2</sub> discontinuous coating, delivered an initial discharge capacity of 196mAh g<sup>−1</sup> and a capacity of 170.5mAh g<sup>−1</sup> after 200 cycles at 1 C, corresponding to a high retention rate of 86.8 %. Furthermore, the discontinuous coating forms an intermittent protective layer while leaving substantial surface areas exposed. This morphology facilitates smoother and more numerous lithium-ion transport pathways, thereby maintaining high ionic conductivity and enhancing the cathode's electrochemical performance.</div></div>","PeriodicalId":17408,"journal":{"name":"Journal of The European Ceramic Society","volume":"46 9","pages":"Article 118218"},"PeriodicalIF":6.2,"publicationDate":"2026-08-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"146191591","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 : 2026-08-01Epub Date: 2026-02-02DOI: 10.1016/j.jeurceramsoc.2026.118206
F. Monteverde , S. Cassese , D. De Prisco , S. Mungiguerra , R. Savino
Compositionally complex (CC) AlB2-type diboride solid solutions (DSSs) containing IV-V-VI group metals were investigated as candidate materials for hypersonic applications using a ground entry simulator. Each CCDSS was composed of Ti and three other transition metals among Zr-Hf-Nb-Ta. Single phase CCDSS dense discs were spark plasma sintered and then exposed to a supersonic dissociated airflow (nominal Mach 3). The overall degradation of the discs was highly dependent on the combination of starting metals, and massive preferential oxidation occurred. The coexistence of Nb and Ta was detrimental. A thermal study was devised and implemented in a numerical model to validate the experimental set-up. The experimental results also showed good agreement with predictions based on a thermodynamic assessment.
{"title":"Searching the limits of compositionally complex AlB2-type diboride solid solutions for hypersonic applications","authors":"F. Monteverde , S. Cassese , D. De Prisco , S. Mungiguerra , R. Savino","doi":"10.1016/j.jeurceramsoc.2026.118206","DOIUrl":"10.1016/j.jeurceramsoc.2026.118206","url":null,"abstract":"<div><div>Compositionally complex (CC) AlB<sub>2</sub>-type diboride solid solutions (DSSs) containing IV-V-VI group metals were investigated as candidate materials for hypersonic applications using a ground entry simulator. Each CCDSS was composed of Ti and three other transition metals among Zr-Hf-Nb-Ta. Single phase CCDSS dense discs were spark plasma sintered and then exposed to a supersonic dissociated airflow (nominal Mach 3). The overall degradation of the discs was highly dependent on the combination of starting metals, and massive preferential oxidation occurred. The coexistence of Nb and Ta was detrimental. A thermal study was devised and implemented in a numerical model to validate the experimental set-up. The experimental results also showed good agreement with predictions based on a thermodynamic assessment.</div></div>","PeriodicalId":17408,"journal":{"name":"Journal of The European Ceramic Society","volume":"46 9","pages":"Article 118206"},"PeriodicalIF":6.2,"publicationDate":"2026-08-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"146191593","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 : 2026-08-01Epub Date: 2026-02-02DOI: 10.1016/j.jeurceramsoc.2026.118205
Yang Zhou , Yanling Huang , Qiumei Huang , Ning Guan , Ning Zhang , Huaicheng Xiang , Ying Tang , Liang Fang
Next-generation wireless communication demands microwave dielectric ceramics that effectively achieve ultra-low loss, a stable resonant frequency, and a low permittivity. Here we demonstrate an entropy-engineering strategy that selectively disorders the [A(2)O6] octahedral site while preserving the rigid [GaO4] tetrahedral backbone in gallium-based olivine A2GaO4. A series of CaY1–x(Nd0.25Sm0.25Eu0.25Yb0.25)xGaO4 ceramics was synthesized by solid-state reaction at 1260–1420 °C. Systematic increases in configurational entropy (ΔSconfig) and ionic-size disorder (δR) drive a reversible Pnma → Pmnb symmetry switch, suppress phase separation, and expand the lattice. At x = 0.8, the high-entropy single-phase olivine exhibits εr = 9.2 ± 0.2, Q×f = 151,025 ± 400 GHz, and τf = -39.8 ± 2.0 ppm/°C, while Vickers hardness rises to 5.79 ± 0.2 GPa. Ultra-low loss is synergistically influenced by ΔSconfig, δR, and packing fraction. A C-band dielectric resonator antenna fabricated from the x = 0.8 composition achieves 92.63 % radiation efficiency and 6.39 dBi gain, validating the entropy-design paradigm for high-frequency applications.
{"title":"Entropy-driven design of ultra-low loss olivine CaY1–x(Nd0.25Sm0.25Eu0.25Yb0.25)xGaO4 microwave dielectric ceramics for 5 G dielectric resonator antennas","authors":"Yang Zhou , Yanling Huang , Qiumei Huang , Ning Guan , Ning Zhang , Huaicheng Xiang , Ying Tang , Liang Fang","doi":"10.1016/j.jeurceramsoc.2026.118205","DOIUrl":"10.1016/j.jeurceramsoc.2026.118205","url":null,"abstract":"<div><div>Next-generation wireless communication demands microwave dielectric ceramics that effectively achieve ultra-low loss, a stable resonant frequency, and a low permittivity. Here we demonstrate an entropy-engineering strategy that selectively disorders the [A(2)O<sub>6</sub>] octahedral site while preserving the rigid [GaO<sub>4</sub>] tetrahedral backbone in gallium-based olivine A<sub>2</sub>GaO<sub>4</sub>. A series of CaY<sub>1–<em>x</em></sub>(Nd<sub>0.25</sub>Sm<sub>0.25</sub>Eu<sub>0.25</sub>Yb<sub>0.25</sub>)<sub><em>x</em></sub>GaO<sub>4</sub> ceramics was synthesized by solid-state reaction at 1260–1420 °C. Systematic increases in configurational entropy (ΔS<sub>config</sub>) and ionic-size disorder (<em>δ</em><sub>R</sub>) drive a reversible <em>Pnma</em> → <em>Pmnb</em> symmetry switch, suppress phase separation, and expand the lattice. At <em>x</em> = 0.8, the high-entropy single-phase olivine exhibits <em>ε</em><sub><em>r</em></sub> = 9.2 ± 0.2, <em>Q×f</em> = 151,025 ± 400 GHz, and <em>τ</em><sub><em>f</em></sub> = -39.8 ± 2.0 ppm/°C, while Vickers hardness rises to 5.79 ± 0.2 GPa. Ultra-low loss is synergistically influenced by ΔS<sub>config</sub>, <em>δ</em><sub>R</sub>, and packing fraction. A C-band dielectric resonator antenna fabricated from the <em>x</em> = 0.8 composition achieves 92.63 % radiation efficiency and 6.39 dBi gain, validating the entropy-design paradigm for high-frequency applications.</div></div>","PeriodicalId":17408,"journal":{"name":"Journal of The European Ceramic Society","volume":"46 9","pages":"Article 118205"},"PeriodicalIF":6.2,"publicationDate":"2026-08-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"146098816","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 : 2026-08-01Epub Date: 2026-02-10DOI: 10.1016/j.jeurceramsoc.2026.118227
Zerong Zhang , Yanan Wang , Zhan Gao , Xin Liu , Lei Wang , Qiuliang Wang
In this work, five different RE123 samples were prepared via solid-state sintering in flowing air, including (Eu0.2Gd0.2Y0.2Er0.2Yb0.2)BCO, (Eu0.25Gd0.25Y0.25Er0.25)BCO, (Eu0.33Gd0.33Y0.33)BCO, (Nd0.25Eu0.25Gd0.25Y0.25)BCO and (La0.2Nd0.2Y0.2Er0.2Yb0.2)BCO. Their phase constituents, phase stabilities, superconducting properties and microstructures were systematically investigated. Results indicated that RE123 samples with almost pure superconducting phase could be prepared; the superconducting transition temperature (Tc) of each sample was > 90.0 K. The lattice parameters and peritectic decomposition temperature (TP) increased with the average ionic radius of RE3 + at the RE site in RE123 samples. The critical current density (Jc) was considerably affected by the constituent elements at the RE site. Specifically, of all samples, (Eu0.25Gd0.25Y0.25Er0.25)BCO exhibited the highest self-field Jc of 373 kA/cm2 at 4.2 K; this remarkable superconducting performance could be mainly attributed to its higher superconducting volume fraction, but meanwhile, the configuration entropy at the RE site also have contributed to its high Jc value due to the formation of nanoscale SFs.
{"title":"Synthesis and characterization of REBa2Cu3O7-y superconductors with multiple rare earth elements","authors":"Zerong Zhang , Yanan Wang , Zhan Gao , Xin Liu , Lei Wang , Qiuliang Wang","doi":"10.1016/j.jeurceramsoc.2026.118227","DOIUrl":"10.1016/j.jeurceramsoc.2026.118227","url":null,"abstract":"<div><div>In this work, five different RE123 samples were prepared via solid-state sintering in flowing air, including (Eu<sub>0.2</sub>Gd<sub>0.2</sub>Y<sub>0.2</sub>Er<sub>0.2</sub>Yb<sub>0.2</sub>)BCO, (Eu<sub>0.25</sub>Gd<sub>0.25</sub>Y<sub>0.25</sub>Er<sub>0.25</sub>)BCO, (Eu<sub>0.33</sub>Gd<sub>0.33</sub>Y<sub>0.33</sub>)BCO, (Nd<sub>0.25</sub>Eu<sub>0.25</sub>Gd<sub>0.25</sub>Y<sub>0.25</sub>)BCO and (La<sub>0.2</sub>Nd<sub>0.2</sub>Y<sub>0.2</sub>Er<sub>0.2</sub>Yb<sub>0.2</sub>)BCO. Their phase constituents, phase stabilities, superconducting properties and microstructures were systematically investigated. Results indicated that RE123 samples with almost pure superconducting phase could be prepared; the superconducting transition temperature (T<sub>c</sub>) of each sample was > 90.0 K. The lattice parameters and peritectic decomposition temperature (T<sub>P</sub>) increased with the average ionic radius of RE<sup>3 +</sup> at the RE site in RE123 samples. The critical current density (J<sub>c</sub>) was considerably affected by the constituent elements at the RE site. Specifically, of all samples, (Eu<sub>0.25</sub>Gd<sub>0.25</sub>Y<sub>0.25</sub>Er<sub>0.25</sub>)BCO exhibited the highest self-field J<sub>c</sub> of 373 kA/<sub>c</sub>m<sup>2</sup> at 4.2 K; this remarkable superconducting performance could be mainly attributed to its higher superconducting volume fraction, but meanwhile, the configuration entropy at the RE site also have contributed to its high J<sub>c</sub> value due to the formation of nanoscale SFs.</div></div>","PeriodicalId":17408,"journal":{"name":"Journal of The European Ceramic Society","volume":"46 9","pages":"Article 118227"},"PeriodicalIF":6.2,"publicationDate":"2026-08-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"146191585","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 : 2026-08-01Epub Date: 2026-02-04DOI: 10.1016/j.jeurceramsoc.2026.118211
Jiawen Song , Haoran Wei , Zhengyuan Shen , Qiang Yang , Ling Xu , Jiahong Niu
In response to the demands for the intelligent thermal structure of aircraft, on-line health monitoring based on high-temperature resistance measurement of ceramic matrix composites (CMCs) can effectively identify the damage state of CMCs. However, highly reliable interconnects between CMCs and metal electrodes remain a major challenge, requiring high temperature resistance, high interface strength and excellent electrical stability. High-performance interconnects were realized by the diffusion reaction of a novel hybrid solder (polysilazane and Ag-Cu-Ti) between Mo electrodes and Cf/SiC composites. Highly conductive and temperature resistant Ti(C,N) and (Ti,Mo)5Si3 were formed on the Cf/SiC and Mo electrode side respectively, and a mixed metal/ ceramic structure Ag(C)/Cu/Ti(C,N) were formed in the hybrid solder matrix. The high-performance interconnects exhibit high interface strength of 14.97–19.07 MPa. The resistance measurement can be conducted stably up to 1200 ℃ in an argon atmosphere and 825 ℃ in air with excellent resistance stability and repeatability.
{"title":"High-performance interconnects for high-temperature resistance measurement toward on-line health monitoring of Cf/SiC composites","authors":"Jiawen Song , Haoran Wei , Zhengyuan Shen , Qiang Yang , Ling Xu , Jiahong Niu","doi":"10.1016/j.jeurceramsoc.2026.118211","DOIUrl":"10.1016/j.jeurceramsoc.2026.118211","url":null,"abstract":"<div><div>In response to the demands for the intelligent thermal structure of aircraft, on-line health monitoring based on high-temperature resistance measurement of ceramic matrix composites (CMCs) can effectively identify the damage state of CMCs. However, highly reliable interconnects between CMCs and metal electrodes remain a major challenge, requiring high temperature resistance, high interface strength and excellent electrical stability. High-performance interconnects were realized by the diffusion reaction of a novel hybrid solder (polysilazane and Ag-Cu-Ti) between Mo electrodes and C<sub>f</sub>/SiC composites. Highly conductive and temperature resistant Ti(C,N) and (Ti,Mo)<sub>5</sub>Si<sub>3</sub> were formed on the C<sub>f</sub>/SiC and Mo electrode side respectively, and a mixed metal/ ceramic structure Ag(C)/Cu/Ti(C,N) were formed in the hybrid solder matrix. The high-performance interconnects exhibit high interface strength of 14.97–19.07 MPa. The resistance measurement can be conducted stably up to 1200 ℃ in an argon atmosphere and 825 ℃ in air with excellent resistance stability and repeatability.</div></div>","PeriodicalId":17408,"journal":{"name":"Journal of The European Ceramic Society","volume":"46 9","pages":"Article 118211"},"PeriodicalIF":6.2,"publicationDate":"2026-08-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"146191680","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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