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Flash-activated low-temperature ultrafast shaping of ZrO2 ceramics ZrO2陶瓷的闪动低温超快成型
IF 6.2 2区 材料科学 Q1 MATERIALS SCIENCE, CERAMICS Pub Date : 2026-08-01 Epub Date: 2026-01-26 DOI: 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.
陶瓷固有的强共价键和离子键严重限制了其在低温下的塑性成形性,限制了其在复杂形状部件中的广泛应用。在这项研究中,我们展示了一种闪光激活的深拉伸方法,该方法可以在800°C的低炉温度和8 mm/min的高成形速度下实现3 摩尔%钇稳定氧化锆的超快塑性成形,这代表了传统陶瓷成形(1450-1750°C,小于0.6 mm/min)和其他现场辅助成形研究(1400-1600°C, ~ 0.1 mm/min)通常需要的极端条件的实质性改进。此外,区域成形实验表明,样品的阳极和中间区域比阴极区域具有更好的成形性,因为局部温度更高,与空位相关的缺陷更少。大量的位错表明变形是由位错调节的晶界滑动控制的,电场/电流增强的扩散进一步促进了晶界调节,并与位错活动协同作用。
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引用次数: 0
Enhancing piezoelectric properties of PZT-based ceramics for ultrasonic device application via Nd-doping and modulating polar nanoregions 通过nd掺杂和调制极性纳米区提高超声器件用压电陶瓷的压电性能
IF 6.2 2区 材料科学 Q1 MATERIALS SCIENCE, CERAMICS Pub Date : 2026-08-01 Epub Date: 2026-02-11 DOI: 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.
Pb(Mg1/3Nb2/3)O3-Pb(Zr0.41Ti0.59)O3是一种具有优异压电性能的钙钛矿材料体系。通过将优化后的Nd离子作为软掺杂剂引入晶格的a位,压电常数(d33)从318 pC/N显著提高到825 pC/N。微观结构表征和电学性能测试表明,优异的压电性能主要源于相结构和弛豫特性的协同调节诱导的极性纳米区(pnr)的形成。通过透射电镜观察莫尔条纹进一步证实了pnr的存在。活化能分析表明,掺nd的PNRs显著促进了畴切换,从而改善了压电性能。在超声检测实验中,PMNZT-xNd陶瓷表现出增强的超声结构健康监测性能,可识别深度为0.06 mm的缺陷,证明了改进压电性能的实用价值。
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引用次数: 0
Aliovalent doping of La2Zr2O7 with Al³ ⁺ and Ta⁵⁺ for CTE tuning 用Al³ +和Ta 5 +掺杂La2Zr2O7进行CTE调谐
IF 6.2 2区 材料科学 Q1 MATERIALS SCIENCE, CERAMICS Pub Date : 2026-08-01 Epub Date: 2026-02-05 DOI: 10.1016/j.jeurceramsoc.2026.118215
A.B. Kuznetsov , S.F. Solodovnikov , D. Sagatova , A.O. Klimov , P.A. Abramov , K.A. Kokh
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 Fd 3¯m) 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.
本文研究了Al3 +和Ta5+离子的共价掺杂对La2Zr2O7 (LZO)结构和热性能的影响,并首次研究了Al3+和Ta5+在LZO中的溶解度。采用机械化学活化法,在1200℃和1500℃下烧结制备样品。结果表明,在观察到的溶解度范围内(Al3+高达x≈0.12,Ta5+高达y≈0.48),掺杂保持了焦绿石型结构(空间群Fd 3¯m)。虽然纯LZO的CTE随温度升高而增加(从7.97 - 25°C到11.50 ×10⁻26°C - 1300°C),但与Al3+和Ta5+共掺杂,特别是la1.96 - al0.09 - ta0.25 - zr1.70 - 7.075组成物,在很宽的温度范围内产生了非常稳定的CTE(从9.09 - 25°C到9.82 ×10⁻26°C - 1300°C),这是制作热障涂层的关键因素。
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引用次数: 0
Mechanistic elucidation of cold sintering behavior in SrFe12O19 ceramics: Role of transient solvent, temperature, and particle morphology SrFe12O19陶瓷冷烧结行为的机理研究:瞬态溶剂、温度和颗粒形貌的作用
IF 6.2 2区 材料科学 Q1 MATERIALS SCIENCE, CERAMICS Pub Date : 2026-08-01 Epub Date: 2026-02-02 DOI: 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).
冷烧结具有低温、低能耗、环保等特点,为SrFe12O19的烧结提供了一条很有前途的途径。本研究系统地研究了瞬态溶剂组成、烧结温度和粉末形貌对SrFe12O19致密化机理的影响。在醋酸-乙醇瞬态溶剂体系中,Fe3 +离子优先溶解并与乙酸和羟基反应形成羧酸铁,有利于颗粒键合和致密化。但随着溶剂浓度和冷烧结温度的升高,其分解为Fe2O3,并有气体释放;被困气体形成孔隙,阻碍致密化,导致在较高温度下致密化程度降低。同时,不规则粉末比球形粉末更能促进“溶解-沉淀”过程。在最佳条件下,瞬时溶剂浓度为16 mol/L,添加量为40 wt%,烧结温度为250℃,压力为1 GPa,保温时间为3 h,球磨粉获得了最佳的复合磁性能(Hcj = 5.31 kOe, Ms = 60.39 emu/g)。
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引用次数: 0
Grain size effect on the shape memory effect of BaTiO3 晶粒尺寸对BaTiO3形状记忆效应的影响
IF 6.2 2区 材料科学 Q1 MATERIALS SCIENCE, CERAMICS Pub Date : 2026-08-01 Epub Date: 2026-02-11 DOI: 10.1016/j.jeurceramsoc.2026.118229
Xiongxin Guo, Baoju Xia, Xinnan Shi, Xinrong Yang, Yagang Qi, Baojin Chu
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.
形状记忆材料(smm)可以在变形后实现应变恢复。铁电陶瓷,如BaTiO3 (BTO),也可以通过铁电-准电转换表现出形状记忆效应(SME)。虽然已知晶粒尺寸(GS)对形状记忆合金(SMAs)中的SME有显著影响,但其在形状记忆陶瓷(SMCs)中的作用仍未被探索。本文采用两步烧结法制备了GS在49 ~ 0.54 μm范围内的BTO陶瓷,研究了GS对SME的影响。结果表明:GS的降低显著提高了残余应变,最大残余应变从0.05 %(粗晶,49 μm)增加到0.15 %(细晶,0.54 μm),增加了约3倍;这种改进是由于在较小的GS BTO陶瓷中增加了90°畴的数量。此外,在冷却过程中施加的外部应力导致残余应变的线性增加。从能量的角度解释了这一现象。应力提高了体系的应变能,当BTO转变为四方相时,促使形成更多的90°畴和更少的180°畴。这项工作为通过控制GS和畴结构来提高铁电陶瓷的SME提供了重要的见解,并提供了在SMCs中定制SME的潜在策略。
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引用次数: 0
Enhancing a high-energy Li-rich cathode for Li-ion batteries via discontinuous ZrO2 coating 通过不连续ZrO2涂层增强锂离子电池高能富锂阴极
IF 6.2 2区 材料科学 Q1 MATERIALS SCIENCE, CERAMICS Pub Date : 2026-08-01 Epub Date: 2026-02-06 DOI: 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 ,&nbsp;Ziyang Ma ,&nbsp;Zhenfei Cai ,&nbsp;Kai Li ,&nbsp;Yuxin Lin ,&nbsp;Qinyu Wu ,&nbsp;Yanan Chen ,&nbsp;Shimiao Chen ,&nbsp;Junzhe Li ,&nbsp;Muhammad Moin ,&nbsp;Yangzhou Ma ,&nbsp;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}
引用次数: 0
Searching the limits of compositionally complex AlB2-type diboride solid solutions for hypersonic applications 寻找复合alb2型二硼化物固溶体在高超声速应用中的极限
IF 6.2 2区 材料科学 Q1 MATERIALS SCIENCE, CERAMICS Pub Date : 2026-08-01 Epub Date: 2026-02-02 DOI: 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.
利用地面进入模拟器,研究了含有IV-V-VI族金属的组成复合物(CC) alb2型二硼化物固溶体(DSSs)作为高超声速应用的候选材料。每个CCDSS由Ti和Zr-Hf-Nb-Ta中的其他三种过渡金属组成。用火花等离子体烧结单相CCDSS致密圆盘,然后暴露在超音速分离气流(名义马赫3)中。圆盘的整体降解高度依赖于起始金属的组合,并发生了大量的优先氧化。Nb和Ta的共存是有害的。设计了一个热研究,并在数值模型中实施,以验证实验设置。实验结果也与基于热力学评估的预测结果非常吻合。
{"title":"Searching the limits of compositionally complex AlB2-type diboride solid solutions for hypersonic applications","authors":"F. Monteverde ,&nbsp;S. Cassese ,&nbsp;D. De Prisco ,&nbsp;S. Mungiguerra ,&nbsp;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}
引用次数: 0
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 5 G介质谐振器天线用超低损耗绿石CaY1-x (Nd0.25Sm0.25Eu0.25Yb0.25) x高4微波介质陶瓷的熵驱动设计
IF 6.2 2区 材料科学 Q1 MATERIALS SCIENCE, CERAMICS Pub Date : 2026-08-01 Epub Date: 2026-02-02 DOI: 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 PnmaPmnb 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.
下一代无线通信要求微波介质陶瓷能够有效地实现超低损耗、稳定的谐振频率和低介电常数。在这里,我们展示了一种熵工程策略,该策略选择性地破坏了镓基橄榄石A2GaO4中的[A(2)O6]八面体位点,同时保留了刚性的[高4]四面体骨架。采用固相反应在1260 ~ 1420℃下合成了一系列CaY1-x (Nd0.25Sm0.25Eu0.25Yb0.25) x高四陶瓷。构型熵(ΔSconfig)和离子尺寸无序(δR)的系统增加驱动了可逆的Pnma→Pmnb对称开关,抑制了相分离,并扩展了晶格。0.8 x = ,熵值单相橄榄石展览εr = 9.2  ±0.2 ,问151025×f =  ± 400 GHz,和τf = -39.8  ± 2.0 ppm /°C,而维氏硬度上升到5.79 ±0.2  GPa。超低损失受ΔSconfig、δR和填料分数的协同影响。由x = 0.8组成的c波段介电谐振器天线实现了92.63 %的辐射效率和6.39 dBi增益,验证了高频应用的熵设计范式。
{"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 ,&nbsp;Yanling Huang ,&nbsp;Qiumei Huang ,&nbsp;Ning Guan ,&nbsp;Ning Zhang ,&nbsp;Huaicheng Xiang ,&nbsp;Ying Tang ,&nbsp;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}
引用次数: 0
Synthesis and characterization of REBa2Cu3O7-y superconductors with multiple rare earth elements 含多稀土元素REBa2Cu3O7-y超导体的合成与表征
IF 6.2 2区 材料科学 Q1 MATERIALS SCIENCE, CERAMICS Pub Date : 2026-08-01 Epub Date: 2026-02-10 DOI: 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.
本文采用流动空气固相烧结法制备了5种不同的RE123样品,分别为(Eu0.2Gd0.2Y0.2Er0.2Yb0.2)BCO、(Eu0.25Gd0.25Y0.25Er0.25)BCO、(Eu0.33Gd0.33Y0.33)BCO、(Nd0.25Eu0.25Gd0.25Y0.25)BCO和(La0.2Nd0.2Y0.2Er0.2Yb0.2)BCO。系统地研究了它们的相组成、相稳定性、超导性能和微观结构。结果表明:可以制备出具有几乎纯超导相的RE123样品;各样品的超导转变温度(Tc)为>; 90.0 K。在RE123样品中,随着RE3 +在RE位点的平均离子半径的增加,晶格参数和包晶分解温度(TP)也随之增加。临界电流密度(Jc)受RE部位组成元素的影响较大。在所有样品中,(Eu0.25Gd0.25Y0.25Er0.25)BCO在4.2 K时表现出373 kA/cm2的最高自场Jc;这种优异的超导性能主要归因于其较高的超导体积分数,但同时,RE位点的组态熵也有助于其高Jc值,这是由于纳米尺度SFs的形成。
{"title":"Synthesis and characterization of REBa2Cu3O7-y superconductors with multiple rare earth elements","authors":"Zerong Zhang ,&nbsp;Yanan Wang ,&nbsp;Zhan Gao ,&nbsp;Xin Liu ,&nbsp;Lei Wang ,&nbsp;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 &gt; 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}
引用次数: 0
High-performance interconnects for high-temperature resistance measurement toward on-line health monitoring of Cf/SiC composites 面向Cf/SiC复合材料在线健康监测的高性能耐高温测量互连
IF 6.2 2区 材料科学 Q1 MATERIALS SCIENCE, CERAMICS Pub Date : 2026-08-01 Epub Date: 2026-02-04 DOI: 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.
针对飞机智能热结构的需求,基于陶瓷基复合材料高温电阻测量的在线健康监测可以有效识别陶瓷基复合材料的损伤状态。然而,cmc和金属电极之间的高可靠互连仍然是一个主要挑战,需要耐高温、高界面强度和优异的电稳定性。通过一种新型杂化焊料(聚硅氮烷和Ag-Cu-Ti)在Mo电极和Cf/SiC复合材料之间的扩散反应,实现了高性能互连。在Cf/SiC和Mo电极侧分别形成了高导电性和耐温性的Ti(C,N)和(Ti,Mo)5Si3,在杂化钎料基体中形成了混合金属/陶瓷结构Ag(C)/Cu/Ti(C,N)。高性能互连体的界面强度达到14.97 ~ 19.07 MPa。该电阻测量在氩气环境下可稳定测量至1200℃,在空气环境下可测量至825℃,具有良好的电阻稳定性和重复性。
{"title":"High-performance interconnects for high-temperature resistance measurement toward on-line health monitoring of Cf/SiC composites","authors":"Jiawen Song ,&nbsp;Haoran Wei ,&nbsp;Zhengyuan Shen ,&nbsp;Qiang Yang ,&nbsp;Ling Xu ,&nbsp;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}
引用次数: 0
期刊
Journal of The European Ceramic Society
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