Journal of The European Ceramic Society最新文献

{"title":"Achieving near-theoretical transmittance in MgAl2O4 ceramic at reduced sintering temperature via solution substitution","authors":"Guangsheng Tu ,&nbsp;Hao Wang ,&nbsp;Bingtian Tu ,&nbsp;Pengyu Xu ,&nbsp;Lu Ren ,&nbsp;Qing Huang ,&nbsp;Rongrong Yang ,&nbsp;Weimin Wang ,&nbsp;Zhengyi Fu","doi":"10.1016/j.jeurceramsoc.2025.117382","DOIUrl":"10.1016/j.jeurceramsoc.2025.117382","url":null,"abstract":"<div><div>Submicron-sized powders are ideal for large-scale industrial production of MgAl₂O₄ transparent ceramics, yet their low sintering activity limits the fabrication of high-quality products. Herein, we demonstrate that the sinterability of MgAl₂O₄ can be significantly improved through appropriate cation substitution. Specifically, by substituting 25 mol% Ga³⁺ for Al³⁺, the temperature required for completing pore closure by pressureless sintering was reduced by 125 °C (1450 °C) and the temperature for achieving near-theoretical transmittance via hot isostatic pressing post-treatment lowered by 300 °C (1500 °C). Such a marked effect may be attributed to the weakened octahedral bonding strength, which accelerates the formation and diffusion of oxygen vacancies upon sintering. Although excessive Ga³⁺ degrades intrinsic hardness, the MgAl_1.5Ga_0.5O₄ ceramic obtained still reached a high hardness (∼13.62 GPa) due to its fine-grained microstructure, compared to the no Ga-addition counterpart. This study provides insights into the rational design of solid solutions with high sintering activity.</div></div>","PeriodicalId":17408,"journal":{"name":"Journal of The European Ceramic Society","volume":"45 11","pages":"Article 117382"},"PeriodicalIF":5.8,"publicationDate":"2025-03-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143678954","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":"Mullite-alumina nacre-like ceramic fabricated by ceramic vat photopolymerization","authors":"Xiangquan Wu ,&nbsp;Jiachen Teng ,&nbsp;Shengyu Wang ,&nbsp;Zhongming Zhang ,&nbsp;Shang Sui ,&nbsp;Chunjie Xu","doi":"10.1016/j.jeurceramsoc.2025.117374","DOIUrl":"10.1016/j.jeurceramsoc.2025.117374","url":null,"abstract":"<div><div>Current investigations have studied using alumina platelets combining with hot press sintering or infiltration process to fabricate toughened nacre-like composite ceramics, while there is still a lack of research on the fabrication of nacre-like ceramics using vat photopolymerization and pressureless sintering. We utilized the gradient shear stress in the local slurry flow in the vat photopolymerization printing to horizontally orient the alumina platelets in the slurry, and then prepared mullite-alumina nacre-like ceramics by combining the template grain growth and the in-situ reaction of SiO₂-Al₂O₃. When the content of alumina platelet accounted for 20 vol%, the bending strengths of load parallel to the printing direction and perpendicular to the printing direction were 344 ± 20 MPa and 352 ± 24 MPa, respectively. The fracture toughness were 3.57 ± 0.38 MPa.m^1/2 and 3.37 ± 0.24 MPa.m^1/2, respectively. The prepared nacre-like structure had the effect of crack deflection and crack twisting in the fracture surface.</div></div>","PeriodicalId":17408,"journal":{"name":"Journal of The European Ceramic Society","volume":"45 11","pages":"Article 117374"},"PeriodicalIF":5.8,"publicationDate":"2025-03-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143678930","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":"Fracture and fatigue behavior of a γ-phase containing WC-Co cemented carbide","authors":"M. Serra ,&nbsp;F. García-Marro ,&nbsp;N. Cinca ,&nbsp;E. Tarrés ,&nbsp;E. Jiménez-Piqué ,&nbsp;L. Llanes","doi":"10.1016/j.jeurceramsoc.2025.117376","DOIUrl":"10.1016/j.jeurceramsoc.2025.117376","url":null,"abstract":"<div><div>This study analyzes the microstructural effects of a third phase on fracture and fatigue characteristics of WC-based cemented carbides. A γ-phase-containing (three-phase) hardmetal grade is investigated and compared to a reference two-phase system, with similar binder content and WC grain size. Isolation of the mixed cubic carbides (third phase) out of the binder plays a key role on determining the fracture and fatigue characteristics. Consequently, coarser microstructural heterogeneities are found acting as critical flaws, decreasing strength, under both monotonic and cyclic loading. Conversely, γ-phase promotes a ceramic-like transgranular crack path for stable crack extension under cyclic loading, yielding lower fatigue sensitivity. Fatigue mechanics and mechanisms of the γ-phase grade align with those of WC-Co systems, independent of crack size. The combined use of pristine and pre-cracked specimens effectively correlates strength, fracture toughness, and fatigue life with estimated and experimentally determined fatigue crack growth exhibited by natural and long through-thickness cracks.</div></div>","PeriodicalId":17408,"journal":{"name":"Journal of The European Ceramic Society","volume":"45 11","pages":"Article 117376"},"PeriodicalIF":5.8,"publicationDate":"2025-03-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143679595","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":"Unique strategy for a highly efficient red phosphor-in-glass ceramic for laser-driven display","authors":"Zhanhao Fan ,&nbsp;Mingwei Fu ,&nbsp;Peng Qiao ,&nbsp;Youjie Hua ,&nbsp;Feifei Huang ,&nbsp;Renguang Ye ,&nbsp;Hongping Ma","doi":"10.1016/j.jeurceramsoc.2025.117377","DOIUrl":"10.1016/j.jeurceramsoc.2025.117377","url":null,"abstract":"<div><div>Advanced laser phosphor display (ALPD) technology based on phosphor converters offers high brightness, a wide colour gamut and no speckle. However, the glass matrix’s relatively low thermal conductivity and red phosphor’s poor thermal stability present key challenges for developing high-efficiency red converters with remarkable luminescence saturation for next-generation ALPD technology. Herein, several novel phosphor-in-glass ceramics (PiGCs) were prepared using spark plasma sintering (SPS) with glass ceramic (GC) powder and CaAlSiN₃: Eu^2 + (CASN) red phosphor as raw materials. The satisfactory crystallinity of the GC powder and the low temperature of SPS enabled these PiGCs to exhibit excellent luminescence performance and tolerate elevated laser power. When fabricated into a phosphor wheel, the high-speed rotating device achieved a luminous flux of 427 lm, with the luminescence saturation threshold exceeding 13.48 W. These results verify that the CASN-PiGC red converter possesses considerable potential for use in high-power laser displays.</div></div>","PeriodicalId":17408,"journal":{"name":"Journal of The European Ceramic Society","volume":"45 11","pages":"Article 117377"},"PeriodicalIF":5.8,"publicationDate":"2025-03-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143678928","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":"Improving the mechanical performance of porous ice-templated bioactive scaffolds through the incorporation of additively manufactured reinforcement frames","authors":"Claudia Paredes ,&nbsp;Jakub Roleček ,&nbsp;Lucie Pejchalová ,&nbsp;Carolina Oliver-Urrutia ,&nbsp;Pedro Miranda","doi":"10.1016/j.jeurceramsoc.2025.117375","DOIUrl":"10.1016/j.jeurceramsoc.2025.117375","url":null,"abstract":"<div><div>The combination of ice-templating and 3D printing represents a promising strategy for the fabrication of robust bioactive scaffolds with multi-scale porosity. The ice-templated microconstituent provides a highly porous heterogeneous environment for cells, while the additively manufactured component serves to mechanically reinforce this porous substrate while occupying minimal space within the resulting composite. Different minimal surface reinforcement structures were obtained by DLP using highly loaded photosensitive suspensions of β-TCP and subsequently infiltrated with aqueous suspensions of the same material. The compressive strength of the reinforced structures improved over 500 %, compared to the ice-templated structures, with Weibull distribution central values of 12.2 ± 1.1 MPa and 2.2 ± 1.1 MPa, respectively. This was accompanied by a significant improvement in their reliability, roughly quintupling their Weibull modulus. Preliminary in vitro tests showed that none of the samples exhibited significant toxicity to MC3T3 cells after cultivation and cell anchorage was observed onto their surfaces.</div></div>","PeriodicalId":17408,"journal":{"name":"Journal of The European Ceramic Society","volume":"45 11","pages":"Article 117375"},"PeriodicalIF":5.8,"publicationDate":"2025-03-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143678952","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":"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":"Significantly enhanced photoelectric/photovoltaic performance in AgNbO3-based solid-solution ceramics","authors":"Ye Tian ,&nbsp;Tian Xia ,&nbsp;Ye Jia ,&nbsp;Chen Chen ,&nbsp;Xiang He ,&nbsp;Liaona She ,&nbsp;Zixiong Sun ,&nbsp;Yuanting Wu ,&nbsp;Wanyin Ge ,&nbsp;Teng Lu ,&nbsp;Li Jin ,&nbsp;Xiaoyong Wei","doi":"10.1016/j.jeurceramsoc.2025.117371","DOIUrl":"10.1016/j.jeurceramsoc.2025.117371","url":null,"abstract":"<div><div>Anomalous photovoltaic effect of ferroelectrics is receiving intensive research interests. However, many ferroelectric materials struggle to effectively harness the solar spectrum due to their large bandgaps. AgNbO₃ has partial visible-light response, but weak photoelectric/photovoltaic performance. Here, we prepare and report the photoelectric/photovoltaic performance of Ag_1-xK_xNbO₃ solid-solution ceramics. The results indicate that all the investigated ceramics exhibit a narrow bandgap (<em>E</em>_g≈1.95 eV); mechanical polishing further improves light-absorption, enhancing photoelectric response. Composition-driven improvements in photoelectric/photovoltaic performance were observed, which is closely linked to the enhanced ferroelectricity. The poling electric-field effect on photoelectric/photovoltaic performance and ferroelectric properties reveals that the open-circuit voltage (<em>V</em>_oc) and short-circuit current (<em>J</em>_sc) are directly proportional to the remnant polarization until the applied field reaches 100 kV/cm. Upon illuminating the polarization-saturated ferroelectric ceramic (x = 0.07) surface, the maximum <em>V</em>_oc (=8 V) and <em>J</em>_sc (=1μA/cm²) were achieved, which are 10 times and 35 times larger, respectively, than those of AgNbO₃ ceramics.</div></div>","PeriodicalId":17408,"journal":{"name":"Journal of The European Ceramic Society","volume":"45 11","pages":"Article 117371"},"PeriodicalIF":5.8,"publicationDate":"2025-03-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143678892","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}