Local structure maturation in high entropy oxide (Mg,Co,Ni,Cu,Zn)1-x(Cr,Mn)xO thin films

IF 3.5 3区材料科学 Q1 MATERIALS SCIENCE, CERAMICS

Journal of the American Ceramic Society Pub Date : 2024-10-06 DOI:10.1111/jace.20171

Gabriela E. Niculescu, Gerald R. Bejger, John P. Barber, Joshua T. Wright, Saeed S. I. Almishal, Matthew Webb, Sai Venkata Gayathri Ayyagari, Jon-Paul Maria, Nasim Alem, John T. Heron, Christina M. Rost

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Abstract

High entropy oxides (HEOs) have garnered much interest due to their available high degree of tunability. Here, we study the local structure of (MgNiCuCoZn)_0.167(MnCr)_0.083O, a composition based on the parent HEO (MgNiCuCoZn)_0.2O. We synthesized a series of thin films via pulsed laser deposition at incremental oxygen partial pressures. X-ray diffraction shows lattice parameters to decrease with increased pO₂ pressures until the onset of phase separation. X-ray absorption fine structure shows that specific atomic species in the composition dictate the global structure of the material as Cr, Co, and Mn shift to energetically favorable coordination with increasing pressure. Transmission electron microscopy analysis on a lower-pressure sample exhibits a rock salt structure, but the higher-pressure sample reveals reflections reminiscent of the spinel structure. In all, these findings give a more complete picture of how (MgNiCuCoZn)_0.167(MnCr)_0.083O forms with varying initial conditions and advances fundamental knowledge of cation behavior in high entropy oxides.

Abstract Image

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高熵氧化物（Mg,Co,Ni,Cu,Zn）1-x(Cr,Mn)xO薄膜的局部结构成熟

高熵氧化物（HEOs）由于具有高度的可调性而引起了人们的广泛关注。在此，我们研究了（MgNiCuCoZn）0.167(MnCr)0.083O的局部结构，这是一种基于母体HEO (MgNiCuCoZn)0.2的组合物。在增量氧分压下，利用脉冲激光沉积技术合成了一系列薄膜。x射线衍射显示晶格参数随着pO2压力的增加而减小，直到相分离开始。x射线吸收精细结构表明，组成中的特定原子种类决定了材料的整体结构，随着压力的增加，Cr， Co和Mn向能量有利的配位转移。透射电子显微镜对低压样品的分析显示出岩盐结构，但高压样品显示出尖晶石结构的反射。总之，这些发现提供了（MgNiCuCoZn）0.167(MnCr)0.083O如何在不同初始条件下形成的更完整的图像，并推进了高熵氧化物中阳离子行为的基本知识。

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来源期刊

Journal of the American Ceramic Society 工程技术-材料科学：硅酸盐

CiteScore

7.50

自引率

7.70%

发文量

590

审稿时长

2.1 months

期刊介绍： The Journal of the American Ceramic Society contains records of original research that provide insight into or describe the science of ceramic and glass materials and composites based on ceramics and glasses. These papers include reports on discovery, characterization, and analysis of new inorganic, non-metallic materials; synthesis methods; phase relationships; processing approaches; microstructure-property relationships; and functionalities. Of great interest are works that support understanding founded on fundamental principles using experimental, theoretical, or computational methods or combinations of those approaches. All the published papers must be of enduring value and relevant to the science of ceramics and glasses or composites based on those materials. Papers on fundamental ceramic and glass science are welcome including those in the following areas: Enabling materials for grand challenges[...] Materials design, selection, synthesis and processing methods[...] Characterization of compositions, structures, defects, and properties along with new methods [...] Mechanisms, Theory, Modeling, and Simulation[...] JACerS accepts submissions of full-length Articles reporting original research, in-depth Feature Articles, Reviews of the state-of-the-art with compelling analysis, and Rapid Communications which are short papers with sufficient novelty or impact to justify swift publication.