Journal of The European Ceramic Society最新文献

{"title":"Integrated visualizations and invisible encryptions for anti-counterfeiting in (K0.5Na0.5)NbO3-based ceramics induced by dynamic photochromic self-bleaching behavior","authors":"Lixiang Deng ,&nbsp;Yan Chen ,&nbsp;Xingan Jiang ,&nbsp;Xiao Wu ,&nbsp;Cong Lin ,&nbsp;Chunlin Zhao ,&nbsp;Min Gao ,&nbsp;Tengfei Lin ,&nbsp;Laihui Luo ,&nbsp;Qiwei Zhang","doi":"10.1016/j.jeurceramsoc.2025.117373","DOIUrl":"10.1016/j.jeurceramsoc.2025.117373","url":null,"abstract":"<div><div>Owing to the difficulty in replication and high security, delayed anti-counterfeiting is an emerging technology for its applicability in encrypting high-precision devices. Materials with photochromic (PC) effects and self-recovery behavior are appropriate candidates for realizing delayed anti-counterfeiting. Herein, Dy³⁺-doped (K_0.5Na_0.5)NbO₃-based ceramics were designed and prepared via tape-casting method. Down-conversion photoluminescence with white emission, conspicuous PC reaction and dynamic PC self-bleaching process were observed in the ceramics. The concentrations and positions of different defect traps, along with the oxygen vacancies of the ceramics, contributed to PC self-recovery. Taking advantage of the difference in PC self-recovery rates between yellow and blue emissions with time and the difference in color temperatures (C.T.), we propose a method of encrypting, calibrating, and performing C.T. detection on the nodes and paths of a single ceramic for optical signal input. This study will guide the construction of visual-invisible double-encryption anti-counterfeiting systems based on other novel materials.</div></div>","PeriodicalId":17408,"journal":{"name":"Journal of The European Ceramic Society","volume":"45 10","pages":"Article 117373"},"PeriodicalIF":5.8,"publicationDate":"2025-03-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143637674","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":"Research on optimizing the crystal structure and enhancing the performance of LLTO solid electrolyte through doping with high-electronegativity Fe3+","authors":"Binxuan Jiang ,&nbsp;Yueming Li ,&nbsp;Kai Li ,&nbsp;Xu Guo ,&nbsp;Jiale Yuan ,&nbsp;Yadzo Emmanuel Kwame","doi":"10.1016/j.jeurceramsoc.2025.117368","DOIUrl":"10.1016/j.jeurceramsoc.2025.117368","url":null,"abstract":"<div><div>The excellent bulk conductivity of the perovskite-type (Li_0.33La_0.56TiO₃, LLTO) solid electrolyte makes it one of the most valuable solid electrolyte materials. However, in the current research, there are few studies examining how electronegativity factors influence the crystal structure of LLTO. In this paper, the solid phase reaction method was adopted to adjust the lattice structure of the material by the chemical formula Li_{0.33-<em>x</em>}Fe_<em>x</em>La_0.56TiO₃(<em>x</em> = 0.01, 0.03,0.05, 0.07 mol) by substituting strong electronegativity Fe³⁺ ions for Li⁺ ions in LLTO. The effects of Fe³⁺ on the structure and properties of LLTO were studied. The results show that the addition of Fe³⁺ can successfully replace Li⁺ in the lattice, effectively improve the cubic phase content, crystal integrity, grain size uniformity and bulk density of LLTO, and further improve the grain conductance. However, increasing the doping amount of Fe³⁺ results in excessive unequal substitution, facilitating the formation of many cation vacancies in the lattice which is detrimental to the growth and perfection of cubic crystals. Also, excess Fe³⁺ causes exaggerated grain growth, reduction of grain size uniformity and the density of the material, thereby reducing the bulk conductance of the material. In this work, optimal comprehensive performance is achieved when the sample is doped with 0.01 mol of Fe³⁺ and sintered at 1220 °C for 6 h. The <em>c</em>-LLTO content reaches 93 %, bulk density of 4.75 g cm⁻³, and bulk conductivity of 1.42 mS cm⁻¹ which is 63.22 % higher than that of the undoped sample. This study demonstrates that the incorporation of Fe³⁺ significantly enhances the bulk conductivity of the material's grains.</div></div>","PeriodicalId":17408,"journal":{"name":"Journal of The European Ceramic Society","volume":"45 11","pages":"Article 117368"},"PeriodicalIF":5.8,"publicationDate":"2025-03-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143644680","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":"Phase tuning on BiCoO3 modified KNN ceramics with increased overall pyroelectric properties and high Curie temperature","authors":"Leimin Wang ,&nbsp;Cong Su ,&nbsp;Yulan Liao ,&nbsp;Hua Hao ,&nbsp;Hanxing Liu","doi":"10.1016/j.jeurceramsoc.2025.117372","DOIUrl":"10.1016/j.jeurceramsoc.2025.117372","url":null,"abstract":"<div><div>Lead-free pyroelectric materials have always been a significant research focus in the field of pyroelectric materials. Numerous studies have achieved a high level of pyroelectric coefficient at room temperature. However, this improvement often comes at the expense of thermal stability. In this study, bismuth-based perovskites with low symmetry and large tetragonal distortion as dopants in KNN ceramics were proposed to enhance their pyroelectric properties. This approach not only resulted in ceramics with high pyroelectric coefficients at room temperature but also exhibited low dielectric constants and high Curie temperatures, indicating excellent figures-of-merit (FOMs) and thermal stabilities for these ceramics. Therefore, the (1-<em>x</em>)(K_0.48Na_0.52)_0.97Li_0.03Nb-<em>x</em>BiCoO₃ ((1-<em>x</em>)KNLN-<em>x</em>BCO, <em>x</em> = 0, 0.005, 0.0075, 0.01, 0.0125) ceramics were investigated, achieving both high room-temperature pyroelectric properties (<em>p</em> = 6.298 × 10 ⁻⁴ C·m ⁻²·℃ ⁻¹, <em>F</em>_i = 3.159 × 10 ⁻¹⁰ m·V⁻¹, <em>F</em>_v = 4.538 × 10 ⁻² m²· C⁻¹, <em>F</em>_d = 2.115 × 10 ⁻⁵ Pa^−1/2, <em>F</em>_e = 56.34 J·m⁻³·K⁻²) and a high Curie temperature of 413 ℃ for <em>x</em> = 0.01, demonstrating exceptional overall performance among KNN ceramics.</div></div>","PeriodicalId":17408,"journal":{"name":"Journal of The European Ceramic Society","volume":"45 11","pages":"Article 117372"},"PeriodicalIF":5.8,"publicationDate":"2025-03-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143644681","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":"Porous Si3N4 ceramics with uniform microstructure fabricated by in-situ pre-gel casting combined with non-directional freeze-drying","authors":"Heng Zhang ,&nbsp;Dongxu Yao ,&nbsp;Ming Zhu ,&nbsp;Yongfeng Xia ,&nbsp;Jun Zhao ,&nbsp;Yu-Ping Zeng","doi":"10.1016/j.jeurceramsoc.2025.117369","DOIUrl":"10.1016/j.jeurceramsoc.2025.117369","url":null,"abstract":"<div><div>Porous Si₃N₄ ceramics hold great promise for high-temperature wave-transparent materials, but it is a significant challenge to achieve both a low dielectric constant and high mechanical strength. This study explores a method combining <em>in-situ</em> pre-gel casting and non-directional freeze-drying to produce high-porosity, uniform microstructure Si₃N₄ ceramics. By adjusting gel concentration and pre-gelation time, ice crystal growth effectively restricted, resulting in a uniform pore structure. The resulting porous Si₃N₄ ceramics exhibited low drying shrinkage (1.50 %) and high porosity (59.13 %), with a flexural strength of 119.48 MPa, surpassing porous ones produced by other wet forming processes. At 30 GHz, the dielectric constant was 2.45, and the dielectric loss was 5.65 × 10⁻³.</div></div>","PeriodicalId":17408,"journal":{"name":"Journal of The European Ceramic Society","volume":"45 10","pages":"Article 117369"},"PeriodicalIF":5.8,"publicationDate":"2025-03-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143628317","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":"Determination of the completion point of the phase transformation based on reactive flash sintering behavior: A case study of LaCrO3","authors":"Ming Li ,&nbsp;Lili Guan ,&nbsp;Yunshuo Zhu ,&nbsp;Yanrui Shi ,&nbsp;Yarong Huang ,&nbsp;Xiwen Song","doi":"10.1016/j.jeurceramsoc.2025.117366","DOIUrl":"10.1016/j.jeurceramsoc.2025.117366","url":null,"abstract":"<div><div>The phase formation and densification of LaCrO₃ were successfully achieved through AC reactive flash sintering (AC-RFS) in one step at a constant temperature of 600°C, using La₂O₃ and Cr₂O₃ as raw materials. The current density curve ‘buffer region’ was discovered under different electric field strengths. The ‘buffer region’ corresponds to the phase transformation from the intermediate phase La₂CrO₆ to the target product LaCrO₃. Joule heating and a high heating rate resulted in nearly full densification of the LaCrO₃ ceramic central region sintered for 1 second at maximum current density. In particular, the behavior of LaCrO₃ was analyzed, and the phase transformation completion point was evaluated based on the RFS behavior without the need for complex testing methods. The discovery of the ‘buffer region’ provides experimental guidance for determining the phase transformation completion points of various other materials in RFS experiments.</div></div>","PeriodicalId":17408,"journal":{"name":"Journal of The European Ceramic Society","volume":"45 11","pages":"Article 117366"},"PeriodicalIF":5.8,"publicationDate":"2025-03-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143642536","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":"Effects of W contents on the oxidation resistance of (Zr, Hf, Nb, Ta, W)C high-entropy carbides at 800–1200 °C","authors":"Weilu Gong ,&nbsp;Yiming Yang ,&nbsp;Ziwei Li ,&nbsp;Li Ye ,&nbsp;Haifeng Cui ,&nbsp;Weijian Han ,&nbsp;PingXia Zhang ,&nbsp;Tong Zhao ,&nbsp;Teng Chen","doi":"10.1016/j.jeurceramsoc.2025.117367","DOIUrl":"10.1016/j.jeurceramsoc.2025.117367","url":null,"abstract":"<div><div>Oxidation resistance of high-entropy carbides is a critical property considering their possible applications in harsh environments. In this work, the oxidation resistance of non-equimolar (Zr, Hf, Nb, Ta, W)C high-entropy carbides (HECCs-W) containing different W content was studied. The results showed that the antioxidation property of the HECCs-W was affected by both W content and oxidation temperature. In-situ oxidation monitoring by high temperature X-ray diffractometer and theoretical calculation results found delayed oxidation effect of W atoms. Combining morphology analysis and phase compositions of the oxide layers, we concluded that the content of W and its oxidation rate at different temperature affected the content of (Nb, Ta, Zr, Hf)_xW_yO_z in the oxide layer, which substantially affected the morphology of the oxide layer, for (Nb, Ta, Zr, Hf)_xW_yO_z usually had a low or negative thermal expansion coefficient. And the morphology of the oxide layer consequently decided the oxidation resistance of the HECCs-W.</div></div>","PeriodicalId":17408,"journal":{"name":"Journal of The European Ceramic Society","volume":"45 10","pages":"Article 117367"},"PeriodicalIF":5.8,"publicationDate":"2025-03-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143628315","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":"Synergetic effect of oxygen vacancy and Cr triggered super-long persistent luminescence in green Ce, Cr: YAGG transparent ceramics","authors":"Zihan Zhou ,&nbsp;Tianyuan Zhou ,&nbsp;Dongshun Chen ,&nbsp;Hongsen Wang ,&nbsp;Lele Xu ,&nbsp;Enjin Liu ,&nbsp;Yuhua Wang ,&nbsp;Zhongzhi Wang ,&nbsp;Wieslaw Strek ,&nbsp;Qiufeng Xu ,&nbsp;Hao Chen ,&nbsp;Le Zhang","doi":"10.1016/j.jeurceramsoc.2025.117364","DOIUrl":"10.1016/j.jeurceramsoc.2025.117364","url":null,"abstract":"<div><div>Ce, Cr: Y₃Al₂Ga₃O₁₂ (Ce, Cr: YAGG) as a new long afterglow material has a considerable developing potential in the fields of emergency indicator, optical information storage and bio-imaging, etc. However, short afterglow duration time and low afterglow brightness have become the key bottlenecks hindering its real applications. In this study, a high initial brightness of 6243.5 mcd/m² and a long duration time of nearly 30 h were obtained in Ce, Cr: YAGG transparent ceramics (after being excited by a 460 nm Xe lamp for 10 min). The afterglow performances of Ce, Cr: YAGG ceramic could be significantly promoted by elevating sintering temperature, applying TEOS as sintering additive and adopting HIP sintering. More oxygen vacancies (relative amount of 32.9 %) within ceramic, compared to vacuum sintering (16.1 %), and Si induced charge compensation of Cr synergetically reinforced afterglow performance of ceramic, while ceramic transparency had a negative impact on it. A competition relationship between the “volume effect” and “light-extraction effect” was revealed in the thick and transparent afterglow medium. A new design strategy for enhancing afterglow performances of long afterglow transparent ceramics was proposed in this study.</div></div>","PeriodicalId":17408,"journal":{"name":"Journal of The European Ceramic Society","volume":"45 10","pages":"Article 117364"},"PeriodicalIF":5.8,"publicationDate":"2025-03-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143621369","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":"Hexagonal boron nitride ceramic reinforced with a dispersed glass phase and microdomain-extruded glass fibers","authors":"Yongheng Zhang ,&nbsp;Jixin Chen ,&nbsp;Hao Zhang ,&nbsp;Guorui Zhao ,&nbsp;Zhihui Li ,&nbsp;Xiaohui Wang ,&nbsp;Fei Li","doi":"10.1016/j.jeurceramsoc.2025.117362","DOIUrl":"10.1016/j.jeurceramsoc.2025.117362","url":null,"abstract":"<div><div>Hexagonal boron nitride (<em>h</em>-BN) is an important engineering ceramic material. However, its layered structure and poor sinterability often result in suboptimal mechanical properties. In this study, <em>h</em>-BN was simultaneously reinforced with a dispersed ytterbium aluminosilicate (YbAS) glass phase and novel in situ microdomain-extruded glass fibers. In situ–formed glass fibers play a vital role in enhancing the composite’s mechanical properties. <em>h</em>-BN/30 vol% YbAS composite sintered at 1600°C showed optimal mechanical properties, with flexural strength, compressive strength, fracture toughness, and elastic modulus of 436 ± 59 MPa, 1072 ± 86 MPa, 4.2 ± 0.3 MPa·m^1/2, and 90.2 ± 0.1 GPa, respectively. The strengthening mechanisms include the co-reinforcement effect, mechanical locking provided by the YbAS glass fibers, and robust interfacial bonding between the <em>h</em>-BN grains and the YbAS glass phase. The proposed novel microstructural design offers a promising pathway for strengthening ceramic performance.</div></div>","PeriodicalId":17408,"journal":{"name":"Journal of The European Ceramic Society","volume":"45 10","pages":"Article 117362"},"PeriodicalIF":5.8,"publicationDate":"2025-03-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143611193","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":"Fabrication of Al2O3-Y3Al5O12-ZrO2 composites by single-step spark plasma sintering","authors":"Maryam Vakhshouri ,&nbsp;Ali Talimian ,&nbsp;Aliasghar Najafzadehkhoee ,&nbsp;Ángela Gallardo-López ,&nbsp;Rosalía Poyato ,&nbsp;Felipe Gutiérrez-Mora ,&nbsp;Dušan Galusek","doi":"10.1016/j.jeurceramsoc.2025.117358","DOIUrl":"10.1016/j.jeurceramsoc.2025.117358","url":null,"abstract":"<div><div>Fabricating Al₂O₃-Y₃Al₅O₁₂-ZrO₂ ceramic composites with a eutectic microstructure is challenging and costly, as it requires high-temperature melting of precursor materials. Here, we report on the successful production of Al₂O₃-Y₃Al₅O₁₂- 5 mol% ZrO₂ composites with lamellar eutectic microstructure through single-step spark plasma sintering (SPS) of sol-gel synthesized powder. The release of volatile species from partially calcined powders, due to limited calcination at 1000°C for 2 h, as well as their fine particle size, were used to create the conditions for local electric discharge and plasma formation during SPS; this resulted in the local formation of eutectic liquids, enabling the formation of lamellar microstructures. The microstructural features can be tailored by modifying the calcination process.</div></div>","PeriodicalId":17408,"journal":{"name":"Journal of The European Ceramic Society","volume":"45 10","pages":"Article 117358"},"PeriodicalIF":5.8,"publicationDate":"2025-03-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143611192","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}

{"title":"Tailoring combined “soft” and “hard” piezoelectric properties in MnO2-doped (Ba,Ca)(Zr,Sn,Ti)O3 piezoceramics via N2 annealing","authors":"Guohui Wang ,&nbsp;Pengrong Ren ,&nbsp;Xiangcheng Qi ,&nbsp;Kai Li ,&nbsp;Lang Bian ,&nbsp;Xin Wang ,&nbsp;Peng Zhang ,&nbsp;Chaowei Guo ,&nbsp;Fangping Zhuo","doi":"10.1016/j.jeurceramsoc.2025.117363","DOIUrl":"10.1016/j.jeurceramsoc.2025.117363","url":null,"abstract":"<div><div>(Ba_1-xCa_x) (Zr_0.04Sn_0.04Ti_0.92)O₃ (BCZST)-based piezoelectric ceramics were prepared using a solid-state reaction method. The refinement of microstructure significantly enhanced the piezoelectric properties of BCZST. BCZST doped with 2 mol% MnO₂ exhibited an impressive mechanical quality factor (<em>Q</em>_m) of approximately 1045, mainly attributed to the suppression of extrinsic domain switching contributions. However, the MnO₂ doping also resulted in a reduction of the piezoelectric coefficient (<em>d</em>₃₃) to 144 pC/N. Notably, annealing the BCZST + 2 mol% MnO₂ in nitrogen led to the coexistence of multiple phases and increased the intrinsic contribution from polarization rotation. This treatment optimized both the hard and soft piezoelectric properties, yielding a <em>Q</em>_m of 721 and a <em>d</em>₃₃ of 220 pC/N. Our multiscale defect-engineering strategy presents a valuable approach for the design of lead-free piezoelectric ceramics with enhanced hardening effects suitable for high-power applications.</div></div>","PeriodicalId":17408,"journal":{"name":"Journal of The European Ceramic Society","volume":"45 10","pages":"Article 117363"},"PeriodicalIF":5.8,"publicationDate":"2025-03-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143611194","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}