高熵(Co,Cu,Mg,Ni,Zn)Al2O4尖晶石的合成、致密化及阳离子转化

IF 2.2 4区材料科学 Q2 MATERIALS SCIENCE, CERAMICS

Journal of Asian Ceramic Societies Pub Date : 2023-06-29 DOI:10.1080/21870764.2023.2227535

C. Corlett, N. Obradović, J. Watts, E. Bohannan, W. Fahrenholtz

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引用次数: 0

摘要

研究了高熵尖晶石(Co0.2Cu0.2Mg0.2Ni0.2 Zn0.2)Al2O4等四种尖晶石基陶瓷的合成、致密化行为和晶体位占率。每种成分都反应形成了单相，但x射线衍射图分析显示，高熵尖晶石的阳离子位置占据率几乎完全正常。对致密化行为进行了研究，结果表明，在低至1375℃的温度下，所有成分都可以通过热压制备出完全致密的陶瓷。所有成分的维氏硬度值均在10gpa以上。与铝酸镍尖晶石的完全阳离子反转行为相比，高熵尖晶石中的阳离子似乎具有稳定作用，导致几乎正常的位置占用。这是第一个比较高熵尖晶石与传统尖晶石陶瓷阳离子位置占用的报告。

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Synthesis, densification, and cation inversion in high entropy (Co,Cu,Mg,Ni,Zn)Al2O4 spinel

ABSTRACT The synthesis, densification behavior, and crystallographic site occupancy were investigated for four different spinel-based ceramics, including a high-entropy spinel (Co0.2Cu0.2Mg0.2Ni0.2 Zn0.2)Al2O4. Each composition was reacted to form a single phase, but analysis of X-ray diffraction patterns revealed differences in cation site occupancy with the high-entropy spinel being nearly fully normal. Densification behavior was investigated and showed that fully dense ceramics could be produced by hot pressing at temperatures as low as 1375°C for all compositions. Vickers’ hardness values were at least 10 GPa for all compositions. The cations present in the high-entropy spinel appear to have a stabilizing effect that led to nearly normal site occupancy compared to full cation inversion behavior of nickel aluminate spinel. This is the first report that compares cation site occupancy of a high-entropy spinel to conventional spinel ceramics.

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来源期刊

Journal of Asian Ceramic Societies Materials Science-Ceramics and Composites

CiteScore

5.00

自引率

4.30%

发文量

审稿时长

10 weeks

期刊介绍： The Journal of Asian Ceramic Societies is an open access journal publishing papers documenting original research and reviews covering all aspects of science and technology of Ceramics, Glasses, Composites, and related materials. These papers include experimental and theoretical aspects emphasizing basic science, processing, microstructure, characteristics, and functionality of ceramic materials. The journal publishes high quality full papers, letters for rapid publication, and in-depth review articles. All papers are subjected to a fair peer-review process.