Lattice distortion and stability of (Co0.2Cu0.2Mg0.2Ni0.2Zn0.2)O high-entropy oxide under high pressure

Materials Today Advances

H. Hahn¹  F. Zhang²  H. Lou³  R. Djenadic⁴  A. Sarkar⁵  H.-P. liermann⁵  L. Tan⁵  B. Cheng⁵  X. Chen⁵  K. Glazyrin⁵  Z. Zeng⁶  L. Wang⁷  J. Yan⁷  Q. Zeng⁸ 

[1] Department of Earth and Planetary Sciences, University of California, Santa Cruz, CA 95064, USA;Institute of Nanotechnology, Karlsruhe Institute of Technology, 76344 Eggenstein-Leopoldshafen, Germany;Shanghai Institute of Laser Plasma, Shanghai, 201800, People's Republic of China;Advanced Light Source, Lawrence Berkeley National Laboratory, Berkeley, CA 94720, USA;Center for High Pressure Science and Technology Advanced Research, Pudong, Shanghai 201203, People's Republic of China;Joint Research Laboratory Nanomaterials, Technische Universität Darmstadt and Karlsruhe Institute of Technology, 64287 Darmstadt, Germany;Photon Sciences, Deutsches Elektronen Synchrotron (DESY), Hamburg, Germany;School of Materials Science and Engineering, Beijing Institute of Technology, Beijing 100081, People's Republic of China;

关键词: Phase transition;    Synchrotron x-ray diffraction;    Pair distribution function;    Nanocrystalline;   

DOI  :  

来源: DOAJ

【 摘 要 】

High-entropy oxides (HEOs) stabilize multiple cations in a single solid solution phase, providing a new opportunity for property engineering in almost infinite compositional space. The structural stability and tunability of HEO are of great interest and importance but has not been well understood, especially under pressure. Here, we studied the structure evolution of a rock salt phase (Co0.2Cu0.2Mg0.2Ni0.2Zn0.2)O HEO using in situ synchrotron X-ray diffraction, pair distribution function, Raman spectroscopy up to ~43 GPa, and ex situ transmission electron microscopy, a pressure-induced reversible rock salt to highly distorted cubic phase transition was observed. These results suggest highly tunable lattice distortion in HEOs under pressure, which could promote the fundamental understanding and also guide applications of HEOs.

【 授权许可】

Unknown