Journal of The European Ceramic Society最新文献

Oxidation resistance and protective mechanism of ZrB2-SiC coating modified by Y2O3 at 1700 ℃

IF 5.8 2区材料科学

Journal of The European Ceramic Society Pub Date : 2025-02-17 DOI: 10.1016/j.jeurceramsoc.2025.117293

Chao Jiang , Xiang Ji , Yuexing Chen , Peipei Wang , Philipp V. Kiryukhantsev-Korneev , Evgeny A. Levashov , Ji Shi , Xuanru Ren , Xueqin Kang , Baojing Zhang , Ping Zhang , Leihua Xu , Peizhong Feng

{"title":"Oxidation resistance and protective mechanism of ZrB2-SiC coating modified by Y2O3 at 1700 ℃","authors":"Chao Jiang , Xiang Ji , Yuexing Chen , Peipei Wang , Philipp V. Kiryukhantsev-Korneev , Evgeny A. Levashov , Ji Shi , Xuanru Ren , Xueqin Kang , Baojing Zhang , Ping Zhang , Leihua Xu , Peizhong Feng","doi":"10.1016/j.jeurceramsoc.2025.117293","DOIUrl":"10.1016/j.jeurceramsoc.2025.117293","url":null,"abstract":"<div><div>To enhance the resistance of ZrB2-SiC-based coatings against oxidation on carbon materials surfaces under ultra-high temperatures, Y2O3 was added to a ZrB2-SiC based coatings, and the structural evolution was investigated upon static oxidation at 1700 °C for 100 min. After modification, Y2O3 effectively inhibited the volume expansion caused by ZrO2 phase transformation, thereby reducing the stress accumulation. Furthermore, the oxidation process led to the dispersion of Y2SiO5, Y2Si2O7 and ZrO2 nanocrystals within the glass matrix, resulting in the formation of a Zr-Y-Si-O composite glass layer. In contrast to the unmodified coating, the 1 wt% Y2O3 doped ZrB2-SiC coating demonstrated superior oxidation resistance, achieving reductions in average oxygen permeability and inert factor by 65.58 % and 53.35 %, respectively. However, an excess of Y2O3 results in Y3+ ions promoting oxide aggregation, which subsequently interacts extensively with SiO2, compromising the structural integrity of the glass film and enhancing the oxidative degradation of the coating.</div></div>","PeriodicalId":17408,"journal":{"name":"Journal of The European Ceramic Society","volume":"45 9","pages":"Article 117293"},"PeriodicalIF":5.8,"publicationDate":"2025-02-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143429046","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

Enhancement of thermoelectric properties of electropositive and electronegative element double-filled CoSb3 via high-pressure regulating

IF 5.8 2区材料科学

Journal of The European Ceramic Society Pub Date : 2025-02-17 DOI: 10.1016/j.jeurceramsoc.2025.117291

Xin Fan , Xiaoqin Tian , Jianxin Chi , Jiao Zhao , Youjin Zheng , Fangbiao Wang , Lei Zhang , Qi Chen , Hongan Ma

{"title":"Enhancement of thermoelectric properties of electropositive and electronegative element double-filled CoSb3 via high-pressure regulating","authors":"Xin Fan , Xiaoqin Tian , Jianxin Chi , Jiao Zhao , Youjin Zheng , Fangbiao Wang , Lei Zhang , Qi Chen , Hongan Ma","doi":"10.1016/j.jeurceramsoc.2025.117291","DOIUrl":"10.1016/j.jeurceramsoc.2025.117291","url":null,"abstract":"<div><div>In this paper, the electropositive-electronegative double-filled skutterudite, which is challenging or impossible to synthesize via conventional methods, was successfully prepared using a high-pressure and high-temperature (HPHT) method. The successful filling of Ba-S into the voids of the CoSb3 crystal structure was confirmed through X-ray diffraction, enthalpy of formation calculations, and EDS spectral analysis. The experimental results indicate that the skutterudite material with porous structure has a lower thermal conductivity of 1.07 W m−1 K−1 at 773 K. The Callaway model fitting analysis revealed that the introduction of Ba, S, and Te enhances both point defect scattering and resonance scattering, thereby effectively reducing the lattice thermal conductivity Consequently, the sample achieves a maximum zT value of 1.44 at 773 K. This work provides novel insights into the study of thermoelectric properties in skutterudite materials.</div></div>","PeriodicalId":17408,"journal":{"name":"Journal of The European Ceramic Society","volume":"45 9","pages":"Article 117291"},"PeriodicalIF":5.8,"publicationDate":"2025-02-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143437628","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

Controllable morphology genetic composites of porous SiC/Ti3SiC2 synthesized via template assembly strategy for tunable microwave absorption performance

IF 5.8 2区材料科学

Journal of The European Ceramic Society Pub Date : 2025-02-17 DOI: 10.1016/j.jeurceramsoc.2025.117296

Zhaoxin Zhong , Tianbao He , Jian Ye , Yuhan Ren , Biao Zhang , Feng Ye

{"title":"Controllable morphology genetic composites of porous SiC/Ti3SiC2 synthesized via template assembly strategy for tunable microwave absorption performance","authors":"Zhaoxin Zhong , Tianbao He , Jian Ye , Yuhan Ren , Biao Zhang , Feng Ye","doi":"10.1016/j.jeurceramsoc.2025.117296","DOIUrl":"10.1016/j.jeurceramsoc.2025.117296","url":null,"abstract":"<div><div>To achieve high-performance electromagnetic microwave absorption materials, the design of structures has proven to be a promising approach. In this study, we propose a novel method to enhance the absorption efficiency in SiC/Ti3SiC2 by modifying polarization properties and manipulating impedance matching within a controlled porous architecture created using the freeze-drying technique. The unidirectionally aligned porous structure of SiC/Ti3SiC2 enables the material to achieve a high absorption intensity with an ultralow RLmin of −61.9 dB at a thickness of 2.5 mm. This high absorption efficiency is attributed to the well-aligned lamellar walls perpendicular to the vertically incident electromagnetic waves, which induce substantial interface reflection and significant polarization effects. Moreover, the spherical porous structure, composed of interconnected SiC/Ti3SiC2 walls with non-directional spherical micropores, effectively resolves the impedance matching and energy loss conflict, resulting in an ultrawide EAB of 4.46 GHz at a thickness of 2.3 mm.</div></div>","PeriodicalId":17408,"journal":{"name":"Journal of The European Ceramic Society","volume":"45 9","pages":"Article 117296"},"PeriodicalIF":5.8,"publicationDate":"2025-02-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143437627","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

Piezoelectric performances of <001> -textured (Ag,K)NbO3 ceramics

IF 5.8 2区材料科学

Journal of The European Ceramic Society Pub Date : 2025-02-15 DOI: 10.1016/j.jeurceramsoc.2025.117284

Xiaoshuai Shen , Qixin Chen , Xingyuan San , Aizhen Song , Jing Wang , Lei Zhao

{"title":"Piezoelectric performances of <001> -textured (Ag,K)NbO3 ceramics","authors":"Xiaoshuai Shen , Qixin Chen , Xingyuan San , Aizhen Song , Jing Wang , Lei Zhao","doi":"10.1016/j.jeurceramsoc.2025.117284","DOIUrl":"10.1016/j.jeurceramsoc.2025.117284","url":null,"abstract":"<div><div>AgNbO3-based ceramics have become a research hotspot due to their antiferroelectric or ferroelectric properties. Herein, <001> -textured (Ag0.9K0.1)NbO3 ceramics with high texture degree of 90.2 % were obtained by the template grain growth technology with NaNbO3 templates, which display good piezoelectric coefficients (d33) of 94 pC/N and large piezoelectric voltage coefficient (g33) of 39 × 10−3 Vm/N at room temperature, with enhancements of 62 % and 182 % than the non-textured ones. Furthermore, the d33 reaches 266 pC/N at the orthorhombic-tetragonal phase boundary and maintains 186–200 pC/N within the temperature range of 150–250 ℃ with a variation of less than 10 %. Due to the high texture degree, the positive strain is increased to 0.15 % in the textured (Ag0.9K0.1)NbO3 ceramics. A microscopic piezoelectric response with an amplitude of 465 pm at 8 V was obtained, which provides direct evidence for the better piezoelectric properties of the textured ceramics from a microscopic perspective.</div></div>","PeriodicalId":17408,"journal":{"name":"Journal of The European Ceramic Society","volume":"45 8","pages":"Article 117284"},"PeriodicalIF":5.8,"publicationDate":"2025-02-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143429222","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

Copper iodide doping on SnSe polycrystalline with enhanced thermoelectric properties

IF 5.8 2区材料科学

Journal of The European Ceramic Society Pub Date : 2025-02-14 DOI: 10.1016/j.jeurceramsoc.2025.117292

Zhuoming Xu, Mohammad Nisar, Junze Zhang, Fu Li, Shuo Chen, Guangxing Liang, Jingting Luo, Zhuanghao Zheng, Yue-Xing Chen

{"title":"Copper iodide doping on SnSe polycrystalline with enhanced thermoelectric properties","authors":"Zhuoming Xu, Mohammad Nisar, Junze Zhang, Fu Li, Shuo Chen, Guangxing Liang, Jingting Luo, Zhuanghao Zheng, Yue-Xing Chen","doi":"10.1016/j.jeurceramsoc.2025.117292","DOIUrl":"10.1016/j.jeurceramsoc.2025.117292","url":null,"abstract":"<div><div>SnSe, known for its low thermal conductivity and eco-friendly nature, is a potential medium-temperature thermoelectric (TE) material. However, its low carrier concentration has hindered achieving a high ZT value in n-type SnSe. This study reports the successful preparation of n-type polycrystalline SnSe0.95-x(CuI)x samples via mechanical alloying and spark plasma sintering, which significantly increased carrier concentration and introduced point defects, enhancing phonon scattering and reducing lattice thermal conductivity. Density functional theory (DFT) calculations reveals that CuI doping altered the bandgap and band degeneracy, enhancing the density-of-states effective mass and benefiting the Seebeck coefficient. The ZT value for the x = 0.03 sample reached a peak of 0.74 at 773 K, marking a significant improvement over the undoped sample. This study presents an effective approach to optimize TE properties through CuI doping, offering a stable and effective method to enhance the thermoelectric performance of n-type polycrystalline SnSe.</div></div>","PeriodicalId":17408,"journal":{"name":"Journal of The European Ceramic Society","volume":"45 8","pages":"Article 117292"},"PeriodicalIF":5.8,"publicationDate":"2025-02-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143429023","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

Solid-state synthesis of stoichiometric and dense CoV2O4 targets

IF 5.8 2区材料科学

Journal of The European Ceramic Society Pub Date : 2025-02-14 DOI: 10.1016/j.jeurceramsoc.2025.117286

Lamiae El Khabchi, Antonio Peña Corredor, François Roulland, Marc Lenertz, Cédric Leuvrey, Jérôme Robert, Gilles Versini, Laurent Schlur, Christophe Lefèvre, Nathalie Viart

{"title":"Solid-state synthesis of stoichiometric and dense CoV2O4 targets","authors":"Lamiae El Khabchi, Antonio Peña Corredor, François Roulland, Marc Lenertz, Cédric Leuvrey, Jérôme Robert, Gilles Versini, Laurent Schlur, Christophe Lefèvre, Nathalie Viart","doi":"10.1016/j.jeurceramsoc.2025.117286","DOIUrl":"10.1016/j.jeurceramsoc.2025.117286","url":null,"abstract":"<div><div>The CoV2O4 (CVO) spinel is a magnetically frustrated compound for which thin films, with their associated substrate-induced strains, can bring challenging new magnetic structures. Research on CVO thin films remains scarce to date, probably hindered by the complex synthesis of CVO stoichiometric targets necessary for their deposition. The difficulty to have V in its +III valence is a serious challenge. We present here a solid-state method for the production of polycrystalline stoichiometric single-phased and dense pellets of CVO. The procedure involves controlling the heat treatment atmospheres to ensure single-phased CoV2O4 powder and homogenising grains size by attrition to promote dense pellet sintering. The significant density of the prepared pellets allows their use as targets for the growth of thin films by techniques such as pulsed laser deposition (PLD) or sputtering and opens the way to alternative thin films depositions.</div></div>","PeriodicalId":17408,"journal":{"name":"Journal of The European Ceramic Society","volume":"45 8","pages":"Article 117286"},"PeriodicalIF":5.8,"publicationDate":"2025-02-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143429223","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Optimized configuration entropy for synergistic enhancement of thermoelectric performance for SrTiO3-based ceramics

IF 5.8 2区材料科学

Journal of The European Ceramic Society Pub Date : 2025-02-14 DOI: 10.1016/j.jeurceramsoc.2025.117290

Peng Cao , Jie Yao , Yuqing Sun , Andrei I. Klyndyuk , Zhihao Li , Adeel Abbas , Natalie S. Krasutskaya , Wenbin Su , Chunlei Wang , Hongchao Wang

{"title":"Optimized configuration entropy for synergistic enhancement of thermoelectric performance for SrTiO3-based ceramics","authors":"Peng Cao , Jie Yao , Yuqing Sun , Andrei I. Klyndyuk , Zhihao Li , Adeel Abbas , Natalie S. Krasutskaya , Wenbin Su , Chunlei Wang , Hongchao Wang","doi":"10.1016/j.jeurceramsoc.2025.117290","DOIUrl":"10.1016/j.jeurceramsoc.2025.117290","url":null,"abstract":"<div><div>High-entropy design has proven effective for optimizing thermoelectric properties, particularly thermal conductivity. However, only appropriate configuration entropy can synergistically enhance thermoelectric performance. Here, La, Nd, Dy and Y are used to modulate configuration entropy of SrTiO3-based ceramics. Thermodynamic evaluations suggest that (Sr1–4xLaxNdxDyxYx)TiO3 components, with configuration entropy from 1.05 to 4.43 J mol−1 K−1, can form single-phase cubic structures. High electrical conductivity and Seebeck coefficient result in power factor of 1213 μW K−2 m−1 at 473 K, exceeding 3 times higher than typical high-entropy ceramics. Point defects, mainly inducing stress field fluctuations, cause lattice thermal conductivity of 3.0 W m−1 K−1 at 973 K, rivalling that of high-entropy ceramics. Ultimately, maximum zT value of 0.2 (x = 0.02, 0.025, 0.03) at high-temperatures surpasses most high-entropy ceramics. Hence, configuration entropy from 3.24 to 4.43 J mol−1 K−1 is more conducive for synergistically optimizing electro-thermal transport properties and enhancing zT in (Sr1–4xLaxNdxDyxYx)TiO3 ceramics.</div></div>","PeriodicalId":17408,"journal":{"name":"Journal of The European Ceramic Society","volume":"45 8","pages":"Article 117290"},"PeriodicalIF":5.8,"publicationDate":"2025-02-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143429221","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

Unlocking the superior performance of Ni-rich layered materials through precise precursor engineering

IF 5.8 2区材料科学

Journal of The European Ceramic Society Pub Date : 2025-02-14 DOI: 10.1016/j.jeurceramsoc.2025.117280

Eunki Kim , Yong Ha Cho , Jun Ho Shin , Hye Ji Eun , Hye In Song , Sang-Hak Lee , Jungdon Suk , San Moon

{"title":"Unlocking the superior performance of Ni-rich layered materials through precise precursor engineering","authors":"Eunki Kim , Yong Ha Cho , Jun Ho Shin , Hye Ji Eun , Hye In Song , Sang-Hak Lee , Jungdon Suk , San Moon","doi":"10.1016/j.jeurceramsoc.2025.117280","DOIUrl":"10.1016/j.jeurceramsoc.2025.117280","url":null,"abstract":"<div><div>In this study, we investigated the influence of precursor engineering on the performances of Ni-rich cathode for LIBs. By systematically varying the NH₄OH to metal ratio during co-precipitation process, we controlled the porosity of precursors, affecting the microstructure of the calcined materials. SEM, BET, and true density analyses revealed that lower NH₄OH/Me ratios produce more porous precursors, which enhance Li-source diffusion and promote uniform sintering. XRD and residual lithium analyses confirmed reduced primary particle and lower residual lithium in the calcined materials, leading to improved rate capability and cyclability. Specifically, cathodes derived from low-density precursors showed a 30 % increase in discharge capacity at 3 C and fewer internal cracks after 50 cycles compared to high-density samples. Mechanical tests indicated that high-density materials exhibited a 250 % increase in fracture toughness. These findings highlight the crucial role of precursor design in optimizing Ni-rich cathodes and offer a straightforward strategy for assessing precursor quality.</div></div>","PeriodicalId":17408,"journal":{"name":"Journal of The European Ceramic Society","volume":"45 8","pages":"Article 117280"},"PeriodicalIF":5.8,"publicationDate":"2025-02-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143429224","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Internal stress optimization enhancing the properties of KNN-based Ni-internal-electrode multilayer piezoelectric actuators

IF 5.8 2区材料科学

Journal of The European Ceramic Society Pub Date : 2025-02-13 DOI: 10.1016/j.jeurceramsoc.2025.117283

Zhihao Dong , Peiyao Zhao , Xiao Ma , Xiaohui Wang , Jian Jiao

{"title":"Internal stress optimization enhancing the properties of KNN-based Ni-internal-electrode multilayer piezoelectric actuators","authors":"Zhihao Dong , Peiyao Zhao , Xiao Ma , Xiaohui Wang , Jian Jiao","doi":"10.1016/j.jeurceramsoc.2025.117283","DOIUrl":"10.1016/j.jeurceramsoc.2025.117283","url":null,"abstract":"<div><div>The KNN-based Ni-internal-electrode multilayer piezoelectric actuators (MLAs) possess the advantages of environmental friendliness and low cost. However, the internal stresses in MLAs suppress the performance of ceramic materials and should be optimized for improving the comprehensive performances of MLAs. This study alleviated the generation of internal stresses in MLAs by modifying the electrode pastes and designing the shapes of the internal electrodes, increasing the inverse piezoelectric coefficient d33* to 450 pm/V. The temperature stability of MLAs is significantly improved compared to the bulk ceramics, indicating that the internal stresses can also play a positive role in MLAs. In addition, the MLAs experience only a 4.7 % decrease in d33* over 5 million fatigue cycles due to the possible delayed propagation of fatigue cracks. The improvement of material properties and the solution to application problems should complement each other, jointly promoting the practicality of lead-free piezoceramics.</div></div>","PeriodicalId":17408,"journal":{"name":"Journal of The European Ceramic Society","volume":"45 8","pages":"Article 117283"},"PeriodicalIF":5.8,"publicationDate":"2025-02-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143420740","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

Low-temperature dielectric relaxation and microwave-terahertz dielectric response of Ca-Sm-Ti-O perovskite ceramics

IF 5.8 2区材料科学

Journal of The European Ceramic Society Pub Date : 2025-02-13 DOI: 10.1016/j.jeurceramsoc.2025.117287

Weijia Guo, Yutian Lu, Chongyang Zhang, Zhenxing Yue

{"title":"Low-temperature dielectric relaxation and microwave-terahertz dielectric response of Ca-Sm-Ti-O perovskite ceramics","authors":"Weijia Guo, Yutian Lu, Chongyang Zhang, Zhenxing Yue","doi":"10.1016/j.jeurceramsoc.2025.117287","DOIUrl":"10.1016/j.jeurceramsoc.2025.117287","url":null,"abstract":"<div><div>Low-loss (high-Q×f, where Q = 1/tan δ) dielectric ceramics can help achieve efficient microwave signal transmission and reduce heat generation. In the traditional Ca-Ln-Ti-O perovskite system (where Ln = rare earth) with the general formula of Ca1–xLn2x/3TiO3 (CSTx), the sharp decline in the Q×f value when x > 0.5 remains unexplained, posing a challenge for designing low-loss ceramics. In this study, CSTx ceramics (x ≤ 0.7) are synthesized via the solid-state reaction method, with a focus on their structure, defects, and broadband dielectric properties. A significant discrepancy between the Q×f values in the microwave and terahertz bands is found when x ≥ 0.6, suggesting the presence of additional loss mechanisms in the microwave band beyond ion displacement depolarization. Meanwhile, the low-frequency dielectric spectra show a weak dielectric relaxation in the low-temperature region, attributed to the partially ordered A-site vacancies. Therefore, this relaxation can act on the microwave frequency band at room temperature, resulting in a sharp decline in Q×f values. Such low-frequency and low-temperature dielectric relaxation should not be ignored in the research of microwave dielectric ceramics. These findings provide a crucial theoretical reference for developing low-loss microwave dielectric ceramics.</div></div>","PeriodicalId":17408,"journal":{"name":"Journal of The European Ceramic Society","volume":"45 8","pages":"Article 117287"},"PeriodicalIF":5.8,"publicationDate":"2025-02-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143420736","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