Journal of The European Ceramic Society最新文献_第2页

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

Preparation, microstructure and properties of C/Ta4HfC5-SiC composite fabricated by PIP method based on a new liquid precursor

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.2025.117281

Fan Wan , Haolin Ma , Lin Zhang , Maofen He , Yurong Chen , Xuemei Li , Changqing Song , Junsheng Li

{"title":"Preparation, microstructure and properties of C/Ta4HfC5-SiC composite fabricated by PIP method based on a new liquid precursor","authors":"Fan Wan , Haolin Ma , Lin Zhang , Maofen He , Yurong Chen , Xuemei Li , Changqing Song , Junsheng Li","doi":"10.1016/j.jeurceramsoc.2025.117281","DOIUrl":"10.1016/j.jeurceramsoc.2025.117281","url":null,"abstract":"<div><div>A novel liquid Ta4HfC5 precursor was produced by modified citric acid complexation method and C/Ta4HfC5-SiC composite was manufactured by precursor impregnation and pyrolysis (PIP) process. The powder obtained after 1800 ℃ heat treatment of the precursor has a diameter range of 50–300 nm, with a median diameter of ∼110 nm. The density and porosity of C/Ta4HfC5-SiC composite are 2.43 g/cm3 and 13.2 %, respectively. Due to the toughening of fibers and the addition of SiC, the overall integrity of C/Ta4HfC5-SiC is improved, achieving high bending strength and fracture toughness of 392.6 MPa and 10.4 MPa·m1/2, respectively. After oxyacetylene ablation assessment of 60 s, the measured mass ablation rate and linear ablation rate of the composite were 11.6 mg/s and 9.1 µm/s, respectively. A complete oxide layer based on the joint effort of oxides of Ta(Hf) and Si was formed on the surface of the composite, with no exposed fibers observed.</div></div>","PeriodicalId":17408,"journal":{"name":"Journal of The European Ceramic Society","volume":"45 8","pages":"Article 117281"},"PeriodicalIF":5.8,"publicationDate":"2025-02-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143420738","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

Enhanced energy storage performance of lead-free silver niobate antiferroelectric ceramics through Yb modification

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.2025.117282

Yajie Hu , Jinhua Du , Ye Zhao , Chunxiao Lu , Yong Li , Xiucai Wang , Xihong Hao

{"title":"Enhanced energy storage performance of lead-free silver niobate antiferroelectric ceramics through Yb modification","authors":"Yajie Hu , Jinhua Du , Ye Zhao , Chunxiao Lu , Yong Li , Xiucai Wang , Xihong Hao","doi":"10.1016/j.jeurceramsoc.2025.117282","DOIUrl":"10.1016/j.jeurceramsoc.2025.117282","url":null,"abstract":"<div><div>AgNbO₃ antiferroelectric (AFE) materials have attracted increasing attention owing to their environmental benefits, large polarization and double hysteresis loop, but they are limited by low breakdown strength and large hysteresis. In this study, the Ag(1–3x)YbxNbO3 ultrafine powder was prepared by hydrothermal process, and the ceramics were sintered in ambient air without a specialized oxygen atmosphere. An impressive recoverable energy density of 3.7 J/cm3 was achieved in Ag₀.₉₄Yb₀.₀₂NbO₃, attributed to enhanced AFE stability. Furthermore, the ceramics exhibited remarkable frequency and temperature stability, with energy density variations of less than 10 % over the 1–100 Hz frequency range and less than 15 % between room temperature and 110°C. An ultrafast discharge process was observed, with 90 % of stored energy being released within 205 ns, demonstrating suitability for advanced high-power device applications. These findings indicate that Yb modification and the hydrothermal process offer a promising route for improving antiferroelectricity and achieving high energy storage performance.</div></div>","PeriodicalId":17408,"journal":{"name":"Journal of The European Ceramic Society","volume":"45 8","pages":"Article 117282"},"PeriodicalIF":5.8,"publicationDate":"2025-02-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143403461","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

A review on the performance and lifetime improvement of thermal barrier coatings

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.2025.117274

Arezoo Sezavar, Seyed Abdolkarim Sajjadi

引用次数: 0

Lead-free KNN-based ceramics with enhanced pyroelectric properties and good temperature stability via constructing phase boundary

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.2025.117285

Yulan Liao , Cong Su , Hua Hao , Leimin Wang , Zhonghua Yao , Minghe Cao , Chenxin Shen , Hanxing Liu

{"title":"Lead-free KNN-based ceramics with enhanced pyroelectric properties and good temperature stability via constructing phase boundary","authors":"Yulan Liao , Cong Su , Hua Hao , Leimin Wang , Zhonghua Yao , Minghe Cao , Chenxin Shen , Hanxing Liu","doi":"10.1016/j.jeurceramsoc.2025.117285","DOIUrl":"10.1016/j.jeurceramsoc.2025.117285","url":null,"abstract":"<div><div>In this work, the influence of Li and BiFeO3 (BF) doping based on potassium sodium niobate (KNN) on the pyroelectric properties of the ceramics was investigated. To achieve two-phase coexistence at room temperature, (K0.5Na0.5)0.95Li0.05NbO3(KNLN) ceramic with a high Curie temperature was selected for doping while BF(BiFeO3) with high ferroelectricity, spontaneous polarization, and good temperature stability was chosen as a variable dopant. By establishing the coexistence of O and T phase at room temperature, the energy barrier for polarization reversal is diminished, thereby enhancing the sensitivity of polarization intensity variations with temperature, ultimately leading to an enhancement in their pyroelectric properties. Consequently, (1-x)KNLN-xBF (x = 0.5 %) exhibited a large pyroelectric coefficient p (471 μC/m2/K) along with excellent figure of merits (FOMs) at room temperature: Fi = 1.94 × 10−10 m V−1, Fv = 0.031 m2 C−1, Fd = 1.49 × 10−5 Pa−1/2, with a high Curie temperature (441℃). Moreover, this component also exhibited good temperature stability, the pyroelectric coefficient could reach 387 μC/m2/K after annealing at 200℃ for an hour, which provides a promising KNN-based materials with commercial value for application of pyroelectric infrared radiation detector (PIRD).</div></div>","PeriodicalId":17408,"journal":{"name":"Journal of The European Ceramic Society","volume":"45 8","pages":"Article 117285"},"PeriodicalIF":5.8,"publicationDate":"2025-02-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143420735","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

Microwave dielectric properties, chemical bonds and infrared reflection spectra of LiMg6AlO8 ceramics with rock salt structures

IF 5.8 2区材料科学

Journal of The European Ceramic Society Pub Date : 2025-02-11 DOI: 10.1016/j.jeurceramsoc.2025.117273

Xingjie Su , Linzhao Ma , Guo Tian, Hongzhi Xiao, Qianbiao Du, Hao Li

引用次数: 0

SiC porous ceramic with oriented pore microstructure for transpiration cooling

IF 5.8 2区材料科学

Journal of The European Ceramic Society Pub Date : 2025-02-11 DOI: 10.1016/j.jeurceramsoc.2025.117279

Bo Zhang , Yunhui Li , Yixuan Gao , Binbin Liu , Xueling Fan

{"title":"SiC porous ceramic with oriented pore microstructure for transpiration cooling","authors":"Bo Zhang , Yunhui Li , Yixuan Gao , Binbin Liu , Xueling Fan","doi":"10.1016/j.jeurceramsoc.2025.117279","DOIUrl":"10.1016/j.jeurceramsoc.2025.117279","url":null,"abstract":"<div><div>Transpiration cooling is an active thermal protection technique with excellent cooling capacity for hypersonic vehicle, and its great development challenges the porous coolant medium seriously. In this paper, SiC porous ceramics with oriented pore microchannels have been fabricated by optimized biological template conversion technology for achieving directional management of coolant in transpiration cooling. The results indicate that SiC porous ceramics have high specific strength (99.3 MPa·cm3/g in radial direction, 343.9 MPa·cm3/g in axial direction), reasonable pore microchannels (diameter of 10～60 μm) and high directionality (tortuosity of 1.1～1.3). The independence of pore channels in this work is considerably superior to that of other porous materials. Additionally, the maximum fluid pressure occurs at the inlet during the permeability, which indicates that failure of ceramic can’t appear as long as fluid pressure at inlet is less than the mechanical strength of ceramic. These research results can provide important reference for optimizing transpiration cooling system.</div></div>","PeriodicalId":17408,"journal":{"name":"Journal of The European Ceramic Society","volume":"45 8","pages":"Article 117279"},"PeriodicalIF":5.8,"publicationDate":"2025-02-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143395515","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

From individual to equimolar binary transition metal diborides: The case of (Nb0.5M0.5)B2, M=Ti, Hf

IF 5.8 2区材料科学

Journal of The European Ceramic Society Pub Date : 2025-02-11 DOI: 10.1016/j.jeurceramsoc.2025.117277

Luca Cappai , Mariano Casu , Antonio Mario Locci , Giacomo Cao , Sebastiano Garroni , Valeria Cannillo , Devis Bellucci , Roberto Orrù

{"title":"From individual to equimolar binary transition metal diborides: The case of (Nb0.5M0.5)B2, M=Ti, Hf","authors":"Luca Cappai , Mariano Casu , Antonio Mario Locci , Giacomo Cao , Sebastiano Garroni , Valeria Cannillo , Devis Bellucci , Roberto Orrù","doi":"10.1016/j.jeurceramsoc.2025.117277","DOIUrl":"10.1016/j.jeurceramsoc.2025.117277","url":null,"abstract":"<div><div>(Nb0.5Ti0.5)B2 and (Nb0.5Hf0.5)B2 in bulk form were produced by Spark Plasma Sintering (SPS) from powders obtained by Self-propagating High-temperature Synthesis. The carbothermal reduction of oxide contaminants with graphite promoted the conversion of secondary phases into equimolar diborides, and improved samples densification, particularly for (Nb0.5Hf0.5)B2 (from 89.7 % to 97.4 %). A single-phase solid solution was obtained for both systems at 2050 °C by SPS, while longer holding times (40 instead of 20 min) were needed for the Hf-containing ceramic. The latter system showed Vickers hardness (18.47 GPa) and Young’s modulus (586 GPa) slightly better than HfB2. NbB2 and (Nb0.5Hf0.5)B2 were the most sensitive systems to the oxidation environment, with the formed oxide scales detached from samples at 600 and 800 °C, respectively, due to volume changes accompanying phase transitions in the generated niobium oxides. Conversely, the formation of a stable mixed oxide (TiNb2O7) made (Nb0.5Ti0.5)B2 more resistant to oxidation, compared to TiB2 and NbB2.</div></div>","PeriodicalId":17408,"journal":{"name":"Journal of The European Ceramic Society","volume":"45 8","pages":"Article 117277"},"PeriodicalIF":5.8,"publicationDate":"2025-02-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143403607","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

Pore coalescence as an inherent problem in the sintering of zirconia nanoparticles

IF 5.8 2区材料科学

Journal of The European Ceramic Society Pub Date : 2025-02-10 DOI: 10.1016/j.jeurceramsoc.2025.117272

Martin Trunec , Premysl Stastny , Eliska Siska Viragova , Dinara Sobola

引用次数: 0

Low-temperature facile and fast preparation of (Hf, Ta)B2-(Hf, Ta)C-SiC ultrahigh-temperature multi-phases ceramics: Microstructure and mechanical properties

IF 5.8 2区材料科学

Journal of The European Ceramic Society Pub Date : 2025-02-10 DOI: 10.1016/j.jeurceramsoc.2025.117268

Huan Guo , Bingzhu Wang , Ruifeng Li , Xiaohu Li , Jixiang Dai , Yongzhong Zhao , Jianjun Sha

{"title":"Low-temperature facile and fast preparation of (Hf, Ta)B2-(Hf, Ta)C-SiC ultrahigh-temperature multi-phases ceramics: Microstructure and mechanical properties","authors":"Huan Guo , Bingzhu Wang , Ruifeng Li , Xiaohu Li , Jixiang Dai , Yongzhong Zhao , Jianjun Sha","doi":"10.1016/j.jeurceramsoc.2025.117268","DOIUrl":"10.1016/j.jeurceramsoc.2025.117268","url":null,"abstract":"<div><div>Aiming at the high sintering temperature and densification difficulty in ultrahigh-temperature ceramics, the low-temperature facial and fast preparation of ultrahigh-temperature multi-phases (Hf, Ta)B2-(Hf, Ta)C-SiC solid solution ceramics was realized using in-situ reaction combined with hot pressing, where the HfSi2, TaSi2, B4C and C were used as raw materials. The effect of Hf/Ta molar ratio on the microstructural evolution and mechanical properties of ultrahigh-temperature multi-phases ceramics was investigated. The results found that the in-situ reaction and the formation of solid solution phase could promote the densification process. On the other hand, the addition of Ta element induced the formation of high aspect ratio grains with an interlock structure within the ceramic matrix and significantly improved the mechanical properties. When the Hf/Ta molar ratio was 7/3, the multi-phases ceramics exhibited the best mechanical properties, with a hardness of 25.59 GPa, a flexural strength of 556.61 MPa, and a fracture toughness of 5.13 MPa·m1/2. The enhanced mechanical properties were attributed to the synergistic effect of multiple strengthening and toughening mechanism, including grain bridging, crack bifurcation and grain pullout induced by high aspect ratio (Hf, Ta)B2 grains.</div></div>","PeriodicalId":17408,"journal":{"name":"Journal of The European Ceramic Society","volume":"45 9","pages":"Article 117268"},"PeriodicalIF":5.8,"publicationDate":"2025-02-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143437721","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