Journal of the American Ceramic Society最新文献_第7页

Thermodynamic evaluation and optimization of the K2O-Al2O3-SiO2 system K2O-Al2O3-SiO2 系统的热力学评估和优化

IF 3.5 3区材料科学

Journal of the American Ceramic Society Pub Date : 2024-08-22 DOI: 10.1111/jace.20093

Jifeng Yang, Lianfeng Yan, Lideng Ye, Guangheng Xiao, Kaige Wang, Yuling Liu, Ligang Zhang, Libin Liu, Yong Du

引用次数: 0

The influence of point defects on the sintering of magnesium oxide 点缺陷对氧化镁烧结的影响

IF 3.5 3区材料科学

Journal of the American Ceramic Society Pub Date : 2024-08-21 DOI: 10.1111/jace.20090

Rawan Halabi, Sasha Simotko, Yoed Tsur

{"title":"The influence of point defects on the sintering of magnesium oxide","authors":"Rawan Halabi, Sasha Simotko, Yoed Tsur","doi":"10.1111/jace.20090","DOIUrl":"10.1111/jace.20090","url":null,"abstract":"In this study, the influence of foreign and native point defects in magnesium oxide on the sintering process is examined. We have introduced dopants into magnesium oxide, with cations that share similar sizes but possess varying charges to minimize the direct impact of strain. The selected foreign cations were as follows: (1) Li1+, an acceptor that enhances the concentration of oxygen vacancies; (2) Sc3+, a donor that enhances the concentration of magnesium (metal) vacancies; and (3) Zn2+, an isovalent dopant. The results reveal that oxygen vacancies introduced by lithium doping greatly decrease the sintering temperature of magnesium oxide compared to the magnesium vacancies’ effect (scandium doping). Zinc doping was found to increase the surface oxygen vacancies with only a minor effect on the sintering temperature. Enhancing the oxygen vacancy concentration by lithium doping creates an additional mechanism for sintering because the anion sublattice is the backbone of the material, and oxygen ion diffusion is the rate-limiting step. Scandium doping also has a sintering–promoting effect, yet a minor one. The doping factor analysis is considered and implies that aliovalent dopants do not affect the concentration of the fast-diffusing species, which are native vacancy associates.","PeriodicalId":200,"journal":{"name":"Journal of the American Ceramic Society","volume":"107 12","pages":"8023-8035"},"PeriodicalIF":3.5,"publicationDate":"2024-08-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1111/jace.20090","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142198337","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"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

Microstructure and mechanical properties of textured high-entropy M₄AlC₃/Al₂O₃ (M = Ti, V, Mo, Nb, Ta) composites 纹理高熵 M₄AlC₃/Al₂O₃（M = Ti、V、Mo、Nb、Ta）复合材料的微观结构和力学性能

IF 3.5 3区材料科学

Journal of the American Ceramic Society Pub Date : 2024-08-21 DOI: 10.1111/jace.20082

Haoran Zou, Wen Zhang, Jinyong Zhang, Lin Ren, Weimin Wang, Fan Zhang, Bin Li, Zhengyi Fu

{"title":"Microstructure and mechanical properties of textured high-entropy M₄AlC₃/Al₂O₃ (M = Ti, V, Mo, Nb, Ta) composites","authors":"Haoran Zou, Wen Zhang, Jinyong Zhang, Lin Ren, Weimin Wang, Fan Zhang, Bin Li, Zhengyi Fu","doi":"10.1111/jace.20082","DOIUrl":"10.1111/jace.20082","url":null,"abstract":"High-performance MAX phase-based composites were developed to overcome the inherent low hardness and low strength of MAX phases by combining lattice distortion-induced strengthening, texture strengthening, and second-phase particle strengthening. Textured high-entropy M4AlC3/Al2O3 (M = Ti, V, Mo, Nb, Ta) composites with different Al2O3 contents were prepared using spark plasma sintering at 1350°C for 70 min. The microstructures of all samples with different compositions were characterized in detail. It was found that as the Al2O3 content increased, the grain size of the high-entropy M4AlC3 phase gradually decreased, and the aggregation of Al2O3 became more severe. Based on this, the density, hardness, strength, and fracture toughness of all composites were tested. The results indicate that all textured composites exhibit significant anisotropy in their properties, with the high-entropy M4AlC3/15 vol%Al2O3 composite showing the best overall performance. Additionally, the mechanism of performance improvement was systematically discussed. This work provides an important reference for the subsequent preparation of high-performance MAX phase-based composites.","PeriodicalId":200,"journal":{"name":"Journal of the American Ceramic Society","volume":"107 12","pages":"8490-8502"},"PeriodicalIF":3.5,"publicationDate":"2024-08-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142198416","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"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

Novel liquid–phase flash sintering of lead zirconate titanate piezo-ceramics 新型液相闪速烧结锆钛酸铅压电陶瓷

IF 3.5 3区材料科学

Journal of the American Ceramic Society Pub Date : 2024-08-21 DOI: 10.1111/jace.20075

Kumar Sadanand Arya, Ram Prakash Singh, Tamoghna Chakrabarti

{"title":"Novel liquid–phase flash sintering of lead zirconate titanate piezo-ceramics","authors":"Kumar Sadanand Arya, Ram Prakash Singh, Tamoghna Chakrabarti","doi":"10.1111/jace.20075","DOIUrl":"10.1111/jace.20075","url":null,"abstract":"Lead-based piezo-ceramics like lead zirconate titanate (PZT) are a mainstay for many piezoelectric applications. However, lead oxide (PbO) evaporation during sintering poses a significant environmental challenge. Flash sintering (FS) is a novel technique that can densify ceramics in seconds and at a much lower furnace temperature. The liquid-phase FS (LPFS) of PZT (Pb (Zr0.5Ti0.5) O3, with 3 wt.% Cu2O and PbO in the molar ratio of 1:4) is investigated in this work. Further, a comparison has been made among the lead loss, dielectric, and piezoelectric properties of flash-sintered and conventionally liquid-phase-sintered PZT. It has been observed that the evaporation of PbO has been brought down 3–5 times by FS. The dielectric constant of LPFS PZT is significantly higher, especially at higher frequencies with lower dielectric loss. An enhanced piezoelectric coefficient in flash-sintered PZT has also been observed. The LPFS of PZT shows that the lead loss can be brought down significantly with the added benefit of enhanced dielectric and piezoelectric properties. XRD and Rietveld analysis show an increase in tetragonality after FS in comparison with conventional sintering. XPS and ESR studies show a difference in defect concentration after FS in comparison with conventional sintering that is likely responsible for the enhanced dielectric and piezoelectric properties.","PeriodicalId":200,"journal":{"name":"Journal of the American Ceramic Society","volume":"107 12","pages":"8007-8022"},"PeriodicalIF":3.5,"publicationDate":"2024-08-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142198333","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"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

Frozen in time: A review of non-ergodic physical systems 冻结在时间中非啮合物理系统综述

IF 3.5 3区材料科学

Journal of the American Ceramic Society Pub Date : 2024-08-21 DOI: 10.1111/jace.20092

Aaron M. Bossen, John C. Mauro

{"title":"Frozen in time: A review of non-ergodic physical systems","authors":"Aaron M. Bossen, John C. Mauro","doi":"10.1111/jace.20092","DOIUrl":"10.1111/jace.20092","url":null,"abstract":"The common feature of non-ergodic systems is an internal timescale that greatly exceeds the external observational timescale <math>\u0000 <semantics>\u0000 <msub>\u0000 <mi>t</mi>\u0000 <mrow>\u0000 <mi>o</mi>\u0000 <mi>b</mi>\u0000 <mi>s</mi>\u0000 </mrow>\u0000 </msub>\u0000 <annotation>${t}_{obs}$</annotation>\u0000 </semantics></math>. This kinetic state of broken ergodicity occurs in many systems, with profound thermodynamic implications. In this work, we present a review of non-ergodic physical systems focused on the common origins of non-ergodic behavior across diverse material systems. We begin with a theoretical discussion of energy landscapes and two treatments of thermodynamics in broken ergodic systems. We then discuss several characteristic material classes that exhibit non-ergodic behavior, describing the process of ergodic breakdown and its signatures for each. The disordered nature and frustration of different energetic interactions in the example systems are discussed as the possible origin of non-ergodic dynamics. We conclude with several considerations that can assist in the identification of non-ergodic behavior. This review intends to unify the behavior of a diverse group of physical systems with a common description to aid future discussions between these fields of study.","PeriodicalId":200,"journal":{"name":"Journal of the American Ceramic Society","volume":"107 12","pages":"7939-7950"},"PeriodicalIF":3.5,"publicationDate":"2024-08-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1111/jace.20092","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142198336","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"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

Delayed fracture of ion-exchange strengthened alkali-aluminosilicate glass 离子交换强化碱铝硅酸盐玻璃的延迟断裂

IF 3.5 3区材料科学

Journal of the American Ceramic Society Pub Date : 2024-08-21 DOI: 10.1111/jace.19993

Jared S. Aaldenberg, Marvin W. Kemmerer, James E. Webb

引用次数: 0

Mechanochemical dehydration and crystallization of supersaturated zirconia–alumina composite nano powders 过饱和氧化锆-氧化铝复合纳米粉体的机械化学脱水和结晶

IF 3.5 3区材料科学

Journal of the American Ceramic Society Pub Date : 2024-08-21 DOI: 10.1111/jace.20106

Yilei Huang, Hongbing Yang, Ruoshi Zhao, Chang-An Wang, Yanhao Dong

{"title":"Mechanochemical dehydration and crystallization of supersaturated zirconia–alumina composite nano powders","authors":"Yilei Huang, Hongbing Yang, Ruoshi Zhao, Chang-An Wang, Yanhao Dong","doi":"10.1111/jace.20106","DOIUrl":"10.1111/jace.20106","url":null,"abstract":"Zirconia/alumina composites are a family of structural ceramics with excellent mechanical properties. In order to improve the engineering reliability of this kind of composites, the uniform spatial distribution of the two phases is necessary. One of the effective methods to achieve this goal is to synthesize uniform zirconia–alumina composite nano powders. Here, we report mechanochemical synthesis of zirconia–alumina composite nano powders, in which dehydration and crystallization of Zr–Y–Al hydroxide can be achieved under milling conditions, leading to the formation of the tetragonal zirconia phase with supersaturated Al3+. The mechanochemically synthesized powders have the uniform element distribution and a fine primary crystallite size of around 11 nm. After sintering at 1400°C, t-ZrO2/α-Al2O3 composite with the uniform phase distribution and grain size distribution could be obtained. To uncover the full benefits of these supersaturated composite powders in ceramic processing, future work could be done to break up the deagglomerations and improve the sinterability of the mechanochemically synthesized zirconia/alumina powders.","PeriodicalId":200,"journal":{"name":"Journal of the American Ceramic Society","volume":"107 12","pages":"8036-8046"},"PeriodicalIF":3.5,"publicationDate":"2024-08-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142198334","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"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

The impact of graphene on the mechanical properties, corrosion behavior, and biocompatibility of an Mg–Ca alloy 石墨烯对镁钙合金机械性能、腐蚀行为和生物相容性的影响

IF 3.5 3区材料科学

Journal of the American Ceramic Society Pub Date : 2024-08-21 DOI: 10.1111/jace.20091

Song-Jeng Huang, Chih-Feng Wang, Murugan Subramani, Sivakumar Selvaraju, Veeramanikandan Rajagopal, Chao-Ching Chiang, Fang-Fu Fan

{"title":"The impact of graphene on the mechanical properties, corrosion behavior, and biocompatibility of an Mg–Ca alloy","authors":"Song-Jeng Huang, Chih-Feng Wang, Murugan Subramani, Sivakumar Selvaraju, Veeramanikandan Rajagopal, Chao-Ching Chiang, Fang-Fu Fan","doi":"10.1111/jace.20091","DOIUrl":"10.1111/jace.20091","url":null,"abstract":"This investigation explores the impact of incorporating graphene (Gr) reinforcement on the microstructure, mechanical properties, corrosion behavior, and biocompatibility of a composite derived from a magnesium–calcium (Mg–Ca) alloy. Two concentrations of Gr (0.1% and 0.2%) were introduced to an Mg–Ca alloy. The addition of 0.1% Gr resulted in a refined grain structure, enhancing both tensile and compression strength. However, electrochemical analysis and immersion testing revealed an increase in corrosion rate (<math>\u0000 <semantics>\u0000 <msub>\u0000 <mi>R</mi>\u0000 <mi>w</mi>\u0000 </msub>\u0000 <annotation>${R}_w$</annotation>\u0000 </semantics></math>) with the incorporation of Gr. Although the corrosion rate of the Mg–Ca-0.1%Gr composite was comparable to that of Mg–Ca, the Mg–Ca–0.2%Gr exhibited higher corrosion rates attributed to the enhancement of micro-galvanic corrosion. Interestingly, cell survival rate tests demonstrated improved biocompatibility for the Mg–Ca–0.1%Gr sample, emphasizing its potential for applications in the biomedical domain, which requires enhanced mechanical strength, corrosion resistance, and biocompatibility.","PeriodicalId":200,"journal":{"name":"Journal of the American Ceramic Society","volume":"107 12","pages":"8312-8327"},"PeriodicalIF":3.5,"publicationDate":"2024-08-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142198338","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"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

Designing eco-friendly alternative microstructures for magnesia-chromium aggregates 为镁铬骨料设计生态友好型替代微结构

IF 3.5 3区材料科学

Journal of the American Ceramic Society Pub Date : 2024-08-21 DOI: 10.1111/jace.20084

Otávio Henrique Borges, Francisco Gil Coury, Nora Brachhold, Christos George Aneziris, Victor Carlos Pandolfelli

{"title":"Designing eco-friendly alternative microstructures for magnesia-chromium aggregates","authors":"Otávio Henrique Borges, Francisco Gil Coury, Nora Brachhold, Christos George Aneziris, Victor Carlos Pandolfelli","doi":"10.1111/jace.20084","DOIUrl":"10.1111/jace.20084","url":null,"abstract":"On the rising demand for eco-friendly refractories, reducing the use of likely toxic magnesia-chromium aggregates remains a challenge. Previous studies by some of the authors have proposed Cr-free alternative compositions, although the morphology of the spinel precipitates has varied across the different suggested systems. The mechanisms involved in the formation of these distinct morphologies were unclear and, therefore, are the focus of this work. In all compositions, SEM/electron backscatter diffraction revealed cube–cube orientation relationships between matrix and precipitates, indicating that their formation is influenced by the lattice parameter misfit (δ), which was measured using synchrotron X-ray diffraction. It could be concluded that coarser and spherical precipitates form to minimize their surface-to-volume ratio in compositions with high absolute δ-values. Conversely, low-misfit systems enable the spinel to form a 3D-network. The potential use of this knowledge to tailor the microstructure of novel compositions was demonstrated by a small Nb2O5 addition into one of the proposed compositions.","PeriodicalId":200,"journal":{"name":"Journal of the American Ceramic Society","volume":"107 12","pages":"8704-8715"},"PeriodicalIF":3.5,"publicationDate":"2024-08-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142198342","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"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 optically chargeable capacity by heterojunction construction via precipitation in Li-doped sodium niobate 通过在掺杂锂的铌酸钠中沉淀构建异质结提高光充电容量

IF 3.5 3区材料科学

Journal of the American Ceramic Society Pub Date : 2024-08-21 DOI: 10.1111/jace.20083

Ziyong Li, Mengnan Qin, Yanzhou Lei, Shuang Gao

{"title":"Enhancement of optically chargeable capacity by heterojunction construction via precipitation in Li-doped sodium niobate","authors":"Ziyong Li, Mengnan Qin, Yanzhou Lei, Shuang Gao","doi":"10.1111/jace.20083","DOIUrl":"10.1111/jace.20083","url":null,"abstract":"Due to the depletion of fossil fuels, extensive CO2 emissions, and growing demand for electrochemical energy, it is important to develop further utilization of renewable energy, as well as advanced energy storage techniques. To this end, the optically chargeable supercapacitor, which can convert the photon energy of solar light into electrochemical energy and store it for long-term usage, attracts extensive investigations. Among these, heterojunction construction was revealed as an effective method to enhance capacity. Recent works have reported the implementations of precipitation in ceramics, where the introduced matrix-precipitate two-phase structure is inspiring for constructing heterojunction, whereas it was seldom reported. In this work, Li-doped NaNbO3 electrode material was prepared by adopting a multi-step solid reaction to precipitate LiNbO3 and construct LiNbO3/NaNbO3 heterojunctions. The electrochemical measurement demonstrates an enhanced optically chargeable capacity of roughly 85% increase at a scan rate of 1 mV/s and a four-fold increase at a charging–discharging current density of 1 A/g, as well as outstanding stability by introducing precipitates and constructing heterojunctions. This finding proposes a novel methodology design of heterojunction construction via precipitation to enhance the optically chargeable capacity of supercapacitor electrode materials and, therefore, may open up a potentially new application field for precipitate-tuned functionality in functional ceramics.","PeriodicalId":200,"journal":{"name":"Journal of the American Ceramic Society","volume":"107 12","pages":"8691-8703"},"PeriodicalIF":3.5,"publicationDate":"2024-08-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142198330","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"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