论高熵氧化物的合成和可成形性

IF 3.5 3区 材料科学 Q2 MATERIALS SCIENCE, MULTIDISCIPLINARY
Manjula M. Kandage, Michal Marszewski
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引用次数: 0

摘要

本文报告了不同类型和组成的高熵氧化物(HEOs)的一种简单而通用的溶液合成方法。希望该方法的灵活性和简便性能推动新型高熵氧化物的开发,并促进对其性质和应用的研究。利用佩奇尼合成法,在明显低于固态合成所需的温度(400-900 °C)下合成了 13 种具有岩盐、萤石、尖晶石和包晶结构的 HEO。本方法使用金属硝酸盐、亚硝酸盐、氯化物,甚至对水敏感的烷氧基化合物作为金属前驱体。利用粉末 X 射线衍射、扫描电子显微镜和能量色散 X 射线光谱对 HEOs 进行了表征。此外,还讨论了阳离子尺寸和电荷规则的松弛以及 HEOs 的可成形性。目前的研究结果表明,材料稳定性的经典标准并不容易转化为高熵系统。例如,为普通包晶制定的众所周知的戈德施密特和八面体公差系数标准似乎并不能很好地描述包晶高熵醚的可成形性。所讨论的放宽阳离子尺寸和电荷规则将有助于了解高熵氧化物体系和开发新的高熵氧化物相。
本文章由计算机程序翻译,如有差异,请以英文原文为准。

On the synthesis and formability of high-entropy oxides

On the synthesis and formability of high-entropy oxides

This paper reports on a straightforward and general solution-based synthesis method for high-entropy oxides (HEOs) of different types and compositions. The flexibility and simplicity of this method are hoped to drive development of new HEOs and study of their properties and applications. Thirteen HEOs with rock salt, fluorite, spinel, and perovskite structures were synthesized using a Pechini-type synthesis at temperatures significantly lower than those necessary in solid-state synthesis (400–900 °C). Metal nitrates, nitrites, chlorides, and even water-sensitive alkoxides were used as the metal precursors with the present method. The HEOs were characterized using powder X-ray diffraction, scanning electron microscopy, and energy-dispersive X-ray spectroscopy. Relaxation of cation size and charge rules and formability of HEOs are also discussed. The present results indicate that the classical criteria for material stability do not readily translate to high-entropy systems. For example, the well-known criteria for Goldschmidt and octahedral tolerance factors established for ordinary perovskites do not seem to describe formability of perovskite HEOs well. The discussed relaxation of cation size and charge rules will contribute to the understanding of HEO systems and development of new HEO phases.

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来源期刊
Journal of Materials Science
Journal of Materials Science 工程技术-材料科学:综合
CiteScore
7.90
自引率
4.40%
发文量
1297
审稿时长
2.4 months
期刊介绍: The Journal of Materials Science publishes reviews, full-length papers, and short Communications recording original research results on, or techniques for studying the relationship between structure, properties, and uses of materials. The subjects are seen from international and interdisciplinary perspectives covering areas including metals, ceramics, glasses, polymers, electrical materials, composite materials, fibers, nanostructured materials, nanocomposites, and biological and biomedical materials. The Journal of Materials Science is now firmly established as the leading source of primary communication for scientists investigating the structure and properties of all engineering materials.
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