Study of high pressure structural stability of CeO_2 nanoparticles

作     者：刘波 刘然 李全军 姚明光 邹勃 崔田 刘冰冰 刘景 

作者机构：State Key Laboratory of Superhard MaterialsJilin University Institute of High Energy PhysicsChinese Academy of Sciences 

出 版 物：《Chinese Physics C》 (中国物理C（英文版）)

年 卷 期：2013年第37卷第9期

页      面：94-98页

核心收录：

学科分类：0709[理学-地质学] 07[理学] 0708[理学-地球物理学] 0804[工学-仪器科学与技术] 0827[工学-核科学与技术] 0703[理学-化学] 070301[理学-无机化学] 0704[理学-天文学] 0702[理学-物理学] 

基　　金：Supported by National Basic Research Program of China(2011CB808200) NSFC(10979001,51025206,51032001,21073071,11004075,11004072,11104105,11079040) Cheung Kong Scholars Programme of China 

主　　题：Ce02 nanomaterials high pressure experimental conditions grain size effect structural stability 

摘      要：In situ high pressure XRD diffraction and Raman spectroscopy have been performed on 12 nm CeO2 nanoparticles. Surprisingly, under quasihydrostatic conditions, 12 nm CeO2 nanoparticles maintain the fluorite- type structure in the whole pressure range （0-51 GPa） during the experiments, much more stable than the bulk counterpart （PT-31 GPa）. In contrast, they experienced phase transition at pressure as low as 26 GPa under non- hydrostatic conditions （adopting CsC1 as pressure medium）. Additionally, 32-36 nm CeO2 nanoparticles exhibit an onset pressure of phase transition at 35 GPa under quasihydrostatic conditions, and this onset pressure is much lower than our result. Further analysis shows both the experimental condition （i.e., quasihydrostatic or non-hydrostatic） and grain size effect have a significant impact on the high pressure behaviors of CeO2 nanomaterials.