Journal of The European Ceramic Society最新文献

{"title":"Microstructure and properties of coating-matrix integrated C/(Hf, Zr, Ti)C-(Ti, Zr, Hf)3SiC2-SiC composites prepared via RMI process","authors":"Xian Liu ,&nbsp;Sijie Kou ,&nbsp;Shaobo Yang ,&nbsp;Chun Guo ,&nbsp;Yujie Chen ,&nbsp;Shangwu Fan ,&nbsp;Xu Ma","doi":"10.1016/j.jeurceramsoc.2025.117642","DOIUrl":"10.1016/j.jeurceramsoc.2025.117642","url":null,"abstract":"<div><div>C/(Hf, Zr, Ti)C-(Ti, Zr, Hf)₃SiC₂-SiC composites with Hf-Zr-Ti based in-situ coatings were prepared by RMI process utilizing HfSi₂-ZrSi₂-TiSi₂ hybrid alloy. The microstructure, mechanical properties, and ablation performance of the composites were investigated. The in-situ coating with (Hf, Zr, Ti)C-(Hf, Zr, Ti)Si₂ as main components was continuously integrated with the matrix. In the substrate, there were more Hf-rich (Hf, Zr, Ti)C in the marginal region and more Ti-rich (Ti, Zr, Hf)₃SiC₂ and SiC in the interior. The flexural strength of the composites was 225 ± 5.93 MPa and fracture toughness was 11 ± 0.85 MPa·m^1/2 under the effect of lamellar (Ti, Zr, Hf)₃SiC₂. After ablation for 60 s, the linear and mass ablation rates of the composites were −2.13 ± 0.91 μm/s and −0.97 ± 0.01 mg/s, respectively. The outstanding ablation resistance was attributed to the glassy SiO₂ promoting (Hf, Zr, Ti)O₂ sintering and liquid TiO₂ healing defects.</div></div>","PeriodicalId":17408,"journal":{"name":"Journal of The European Ceramic Society","volume":"45 15","pages":"Article 117642"},"PeriodicalIF":5.8,"publicationDate":"2025-06-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144502302","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}

{"title":"Current-controlled flash sintering experiments on rutile TiO2: Microstructure and defect structure evolution","authors":"Chandan Singh,&nbsp;Shubham Kumar Singh,&nbsp;Tamoghna Chakrabarti,&nbsp;Devinder Yadav","doi":"10.1016/j.jeurceramsoc.2025.117632","DOIUrl":"10.1016/j.jeurceramsoc.2025.117632","url":null,"abstract":"<div><div>This study explored the current-controlled flash sintering of rutile TiO₂ using current ramp rates from 50 to 500 mA/min. Our findings reveal significant heterogeneity in microstructure and defect distribution along the gauge length, underscoring the critical role of applied current ramp rates in modulating oxygen vacancy formation in rutile TiO₂. Lower ramp rates led to abnormal grain growth and Magnéli phase formation in mid-region, alongside varied point defect distribution. Finite element analysis accurately predicted flash sintering temperature profiles, accounting for Joule heating and thermal runaway. However, master sintering curve analysis underestimated densification, which varied with current ramp rate, indicating operation of athermal densification mechanisms. Notably, current flow generated oxygen vacancy concentrations was approximately 60 times higher than predicted by thermal activation alone. The results indicate flash sintering to be electrically-driven, non-equilibrium process where precise control over electrical parameters allows for novel manipulation of defect chemistry, mass transport, and microstructural evolution.</div></div>","PeriodicalId":17408,"journal":{"name":"Journal of The European Ceramic Society","volume":"45 15","pages":"Article 117632"},"PeriodicalIF":5.8,"publicationDate":"2025-06-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144517865","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}

{"title":"Synergistic modulation of magnetic and dielectric properties in high-Bi-content garnet ferrites","authors":"Yang Xiao ,&nbsp;Jie Li ,&nbsp;Yan Yang ,&nbsp;Yida Lei ,&nbsp;Yanlin Ma ,&nbsp;Yingli Liu","doi":"10.1016/j.jeurceramsoc.2025.117639","DOIUrl":"10.1016/j.jeurceramsoc.2025.117639","url":null,"abstract":"<div><div>Garnet-type ferrites Bi_1.2Ca_3<em>x</em>Y_{1.8–3<em>x</em>}Zr_<em>x</em>V_<em>x</em>Fe_{5–2<em>x</em>}O₁₂ (<em>x</em> = 0.1–0.6) were synthesized via solid-state reaction, with Bi–Ca ions predominantly occupying dodecahedral c-sites. The phase stability and microstructure were significantly improved through Ca-Zr-V multi-ion doping, which served as the foundation for excellent magnetic and dielectric properties. The dielectric constant (ε_r &gt; 22) was increased by the strong spin-orbit coupling and high polarizability of Bi³⁺ . The Bi³⁺-induced magnetocrystalline anisotropy was suppressed by Zr⁴⁺ and V⁵⁺, which lowered the ferromagnetic resonance (FMR) linewidth (ΔH) to 73.06 Oe. Grain refinement shortened the spin-wave propagation path, leading to a maximum spin-wave linewidth (ΔH_k) of 13.10 Oe. At <em>x</em> = 0.50, optimal properties were achieved (ε_r = 22.43, tanδ_ε = 1.26 ×10_-³, ΔH = 73.06 Oe, ΔH_k = 10.30 Oe, M_s = 15.60 emu/g), and the synergistic optimization of high dielectric constant, low loss, and broad spin-wave linewidth was realized for the first time in ferrites for miniaturized circulators.</div></div>","PeriodicalId":17408,"journal":{"name":"Journal of The European Ceramic Society","volume":"45 15","pages":"Article 117639"},"PeriodicalIF":5.8,"publicationDate":"2025-06-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144489641","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}

{"title":"Effect of Sr2+ substitution on the sintering behavior and microwave dielectric properties of CaNd2(MoO4)4 ceramics","authors":"Po-Wei Huang,&nbsp;Ching-Cheng Huang,&nbsp;Cheng-Liang Huang","doi":"10.1016/j.jeurceramsoc.2025.117641","DOIUrl":"10.1016/j.jeurceramsoc.2025.117641","url":null,"abstract":"<div><div>A novel low-temperature sintering microwave dielectric ceramic CaNd₂(MoO₄)₄ was synthesized via a conventional solid-state reaction route and its microwave dielectric properties, microstructural characteristics, and chemical bond features were systematically investigated. The influence of substituting Ca²⁺ with Sr²⁺ in the specimen, denoted as Ca_1–xSr_xNd₂(MoO₄)₄ (x = 0.01 – 0.09), on the microwave dielectric properties was also studied. The CaNd₂(MoO₄)₄ ceramic exhibited a tetragonal crystalline phase with space group I41/a at a sintering temperature of 820 °C, delivering optimal microwave dielectric properties (<span><math><msub><mrow><mi>ε</mi></mrow><mrow><mi>r</mi></mrow></msub></math></span> = 10.4 ± 0.06, <em>Q</em>×<em>f</em> = 71,000 ± 2130 GHz, <span><math><msub><mrow><mi>τ</mi></mrow><mrow><mi>f</mi></mrow></msub></math></span> = −61.4 ± 4.9 ppm/°C). Moreover, limited solid solubility and a significant enhancement in microwave dielectric properties were achieved through trace Sr²⁺ substitution. The composition with x = 0.05 sintered at 850 °C exhibited the most promising performance (<span><math><msub><mrow><mi>ε</mi></mrow><mrow><mi>r</mi></mrow></msub></math></span> = 11.9 ± 0.07, <em>Q</em>×<em>f</em> = 105,000 ± 3150 GHz, <span><math><msub><mrow><mi>τ</mi></mrow><mrow><mi>f</mi></mrow></msub></math></span> = −50.9 ± 4.1 ppm/°C). Notably, Ca_1–xSr_xNd₂(MoO₄)₄ ceramics (x = 0 and 0.05) demonstrated good chemical compatibility with Ag after co-firing. Furthermore, analysis based on P-V-L bond theory and Raman spectroscopy reveals that the superior microwave dielectric properties can be primarily attributed to the dominant contribution of Ca/Nd–O bonds in lattice vibrational modes, which effectively suppress intrinsic dielectric loss. These outstanding microwave dielectric properties make the proposed ceramics highly promising candidates for high-frequency LTCC applications.</div></div>","PeriodicalId":17408,"journal":{"name":"Journal of The European Ceramic Society","volume":"45 15","pages":"Article 117641"},"PeriodicalIF":5.8,"publicationDate":"2025-06-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144470922","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}

{"title":"The influences of Cr3C2 addition on the phase formation and mechanical properties of (Zr,Ti,Nb,Ta,Hf)C","authors":"Li Xu,&nbsp;Wei Liao,&nbsp;Xiaosong Zhou,&nbsp;Yongqiang Tan","doi":"10.1016/j.jeurceramsoc.2025.117640","DOIUrl":"10.1016/j.jeurceramsoc.2025.117640","url":null,"abstract":"<div><div>The influences of Cr₃C₂ addition on phase formation, microstructures and mechanical properties of (Zr,Ti,Nb,Ta,Hf)C prepared from binary carbides mixtures by spark plasma sintering were studied. The introduction of 4/3 mol.% Cr₃C₂ significantly lowered the minimum temperature for uniform high-entropy phase (Zr,Ti,Nb,Ta,Hf)C from 2200 °C for to 1900 °C. The lower solubility limit of Cr in (Zr,Ti,Nb,Ta,Hf,Cr)C results in excessive Cr₃C₂-based carbides, which tends to segregate along grain boundaries at higher sintering temperatures while locate at triple junctions at lower sintering temperatures. High mechanical strength of 599 MPa were obtained when 4/3 mol.% Cr₂C₃ was added and sintered at 1900 °C. The fine grain size and Cr₃C₂-based carbides are responsible for the high mechanical properties. More Cr₂C₃ addition results in lower mechanical properties due to excessive Cr₃C₂-based carbides.</div></div>","PeriodicalId":17408,"journal":{"name":"Journal of The European Ceramic Society","volume":"45 15","pages":"Article 117640"},"PeriodicalIF":5.8,"publicationDate":"2025-06-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144489638","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}

{"title":"Ultra-high Q×f and low εr of microwave dielectric ceramic SrYb2O4 with mitigated rattling effect and design of dielectric resonant antenna for 5 G applications","authors":"Siying Zhang ,&nbsp;Xiaolong Gu ,&nbsp;Ning Zhang ,&nbsp;Chongkang He ,&nbsp;Jie Li ,&nbsp;Huaicheng Xiang ,&nbsp;Ying Tang ,&nbsp;Liang Fang","doi":"10.1016/j.jeurceramsoc.2025.117637","DOIUrl":"10.1016/j.jeurceramsoc.2025.117637","url":null,"abstract":"<div><div>Binary rare-earth oxides exhibit promising potential for applications in high-frequency wireless communication devices due to their low permittivity and adjustable resonant frequency. However, a significant challenge remains in achieving ultra-low dielectric loss. The rattling effect of cations is the primary structural factor that influences losses and has become an important method for modulating dielectric properties. In this work, we propose a strategy to mitigate the rattling effect of cations by regulating the ion radius difference between Sr and Ln (lanthanide), reducing the microwave dielectric loss of SrYb₂O₄ ceramic. The SrYb₂O₄ ceramic was prepared at 1450 °C, exhibiting a low <em>ε</em>_<em>r</em> of 16.1, a negative <em>τ</em>_<em>f</em> of −31.33 ppm/°C, and an ultra-high <em>Q</em>×<em>f</em> of 118,777 GHz. The <em>ε</em>_<em>r</em> and <em>τ</em>_<em>f</em> were affected by the ionic polarizability and the bond valence. The reduction of the cationic rattling effect resulted in a higher <em>Q</em>×<em>f</em>. Furthermore, a dielectric resonator antenna was designed for 5 G communication applications.</div></div>","PeriodicalId":17408,"journal":{"name":"Journal of The European Ceramic Society","volume":"45 15","pages":"Article 117637"},"PeriodicalIF":5.8,"publicationDate":"2025-06-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144470920","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}

{"title":"Synergistic enhancement of thermoelectric performance in n-type PbSe through Sn and Cu co-doping by tuning carrier transport and thermal properties","authors":"Shaoqing Lu ,&nbsp;Shengmao Sha ,&nbsp;Jian Wang ,&nbsp;Lulu Huang ,&nbsp;Yu Liu ,&nbsp;Jian Yan ,&nbsp;Yucheng Wu","doi":"10.1016/j.jeurceramsoc.2025.117636","DOIUrl":"10.1016/j.jeurceramsoc.2025.117636","url":null,"abstract":"<div><div>PbSe is a promising thermoelectric (TE) material with excellent carrier transport properties and an economic advantage due to the lower cost of selenium compared to tellurium, making it a potential alternative to PbTe. Improving its TE performance through dual-element doping represents a widely employed approach. In this study, the TE properties of n-type PbSe are improved through the simultaneous incorporation of Sn and Cu into the PbSe matrix. By precisely controlling the Pb content, we enable Sn dopants to occupy both interstitial sites and substitutional Pb positions, thereby significantly enhancing electrical conductivity. Meanwhile, interstitial Cu exhibits a temperature-dependent dissolution-precipitation behavior, dynamically turning the carrier concentration and improving electrical transport properties. The dual-doping strategy also introduces abundant point defects, effectively scattering phonons and reducing the lattice thermal conductivity. As a result, the electrical transport properties of the co-doped Pb_0.99Sn_0.01Se-0.7 %Cu sample are further improved by Pb regulation, achieving a power factor of 24.2 mW cm⁻¹K⁻² and a peak <em>zT</em> value of 1.80 at 728 K. These results demonstrate the effectiveness of the Sn and Cu co-doping approach in enhancing the TE performance of PbSe, offering promise for the development of cost-effective and high-performance TE materials.</div></div>","PeriodicalId":17408,"journal":{"name":"Journal of The European Ceramic Society","volume":"45 15","pages":"Article 117636"},"PeriodicalIF":5.8,"publicationDate":"2025-06-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144479948","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}

{"title":"Editorial – Special section on selected papers from 18th edition of the European Inter-Regional Conference on Ceramics (CIEC)","authors":"Daniele Mari,&nbsp;Raul Bermejo,&nbsp;Frank Clemens","doi":"10.1016/j.jeurceramsoc.2025.117634","DOIUrl":"10.1016/j.jeurceramsoc.2025.117634","url":null,"abstract":"","PeriodicalId":17408,"journal":{"name":"Journal of The European Ceramic Society","volume":"45 15","pages":"Article 117634"},"PeriodicalIF":5.8,"publicationDate":"2025-06-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144364737","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}

{"title":"Impact of ceramic membrane pore size and metal oxide modifications on pharmaceutical degradation in a Hybrid Ozonation–Membrane Filtration reactor","authors":"Nikoletta Tsiarta ,&nbsp;Silvia Morović ,&nbsp;Vilko Mandić ,&nbsp;Arijeta Bafti ,&nbsp;Lidija Ćurković ,&nbsp;Wolfgang Gernjak","doi":"10.1016/j.jeurceramsoc.2025.117635","DOIUrl":"10.1016/j.jeurceramsoc.2025.117635","url":null,"abstract":"<div><div>This study investigates the integration of catalytic ozonation with membrane filtration using ceramic membranes to enhance pharmaceutical’s removal. Ceramic membranes with four MWCOs and pore size (50 kDa, 150 kDa, 300 kDa, and 200 nm) were modified via a sol-gel vacuum infiltration method with CeO₂, CeTiO_x, and a dual-layer CeO₂+CeTiO_x coating to promote ozone activation and hydroxyl radical (^●OH) generation. Continuous-flow Hybrid Ozonation–Membrane Filtration (HOMF) experiments demonstrated that dual-layer modifications significantly enhanced degradation rates of carbamazepine, diclofenac, ibuprofen, and pCBA, with lower MWCO membranes exhibiting higher adsorption and retention. Scavenger tests using tert‑butanol confirmed the critical role of ^●OH, while SEM, AFM, XRD, and MIP characterization revealed substantial changes in surface morphology and pore structure. This study is the first to systematically examine the interactions between ultrafiltration and microfiltration ceramic membranes with varying MWCO and tailored surface modifications, providing novel insights for optimizing catalytic ozonation for pharmaceutical degradation in water treatment.</div></div>","PeriodicalId":17408,"journal":{"name":"Journal of The European Ceramic Society","volume":"45 15","pages":"Article 117635"},"PeriodicalIF":5.8,"publicationDate":"2025-06-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144471057","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}

{"title":"Two-step sintering of nanocrystalline Y3Al5O12 ceramics","authors":"Yuanyuan Li,&nbsp;Hongbing Yang,&nbsp;Yilei Huang,&nbsp;Shichang Cheng,&nbsp;Chang-An Wang,&nbsp;Yanhao Dong","doi":"10.1016/j.jeurceramsoc.2025.117631","DOIUrl":"10.1016/j.jeurceramsoc.2025.117631","url":null,"abstract":"<div><div>Yttrium aluminum garnet (Y₃Al₅O₁₂, YAG) is of interest in applications of transparent ceramics, laser ceramics, and structural components. Synthesis and processing of YAG nanopowders and nanocrystalline ceramics have been explored by a number of methods in the literature. Nevertheless, sintering to full density while maintaining nanocrystalline grain size below 100 nm is challenging. Two-step sintering of fine-grain YAG ceramics has also been practiced, yet with marginal success. Here we reported two-step sintering of dispersed YAG nanopowders formed by centrifugal casting and obtain 99.1 % relative density and 65 nm average grain size. No grain growth occurs in the second sintering step. Post-sintering iso-thermal grain growth experiments revealed low grain boundary mobility below 1450 °C and zero grain growth at 1100 °C up 10 h. The implications on further development of nanocrystalline YAG ceramics shall be discussed.</div></div>","PeriodicalId":17408,"journal":{"name":"Journal of The European Ceramic Society","volume":"45 15","pages":"Article 117631"},"PeriodicalIF":5.8,"publicationDate":"2025-06-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144489640","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}