Subramani T, Voskanyan A, Jayanthi K, Abramchuk M, Navrotsky A
School of Molecular Sciences and Navrotsky Eyring Center for Materials of the Universe, Arizona State University, Tempe, AZ, United States.
Front Chem. 2021 Sep 1;9:719169. doi: 10.3389/fchem.2021.719169. eCollection 2021.
Order-disorder on both cation and oxygen sites is a hallmark of fluorite-derived structures, including pyrochlores. Ordering can occur on long- and short-range scales and can result in persistent metastable states. In various cubic oxide systems, different types of disorder are seen. The purpose of this paper is to review and compare the types and energetics of order-disorder phenomena in several families of cubic oxides having pyrochlore, weberite, defect fluorite, perovskite, rocksalt, and spinel structures. The goal is to better understand how structure, composition, and thermodynamic parameters (enthalpy and entropy) determine the feasibility of different competing ordering processes and structures in these diverse systems.
阳离子和氧位点上的有序-无序是萤石衍生结构（包括烧绿石）的一个标志。有序化可以在长程和短程尺度上发生，并可能导致持久的亚稳态。在各种立方氧化物体系中，可以观察到不同类型的无序。本文的目的是回顾和比较具有烧绿石、韦氏体、缺陷萤石、钙钛矿、岩盐和尖晶石结构的几类立方氧化物中有序-无序现象的类型和能量学。目标是更好地理解结构、组成和热力学参数（焓和熵）如何决定这些不同体系中不同竞争有序过程和结构的可行性。
