|
|||||
|
|
Studies on Im-3-type KSbO3 using high pressure X-ray diffraction and Raman spectroscopy |
|
| Authors: | Huifang Zhao Yu Tian Yunhong He Yanchun Li Xiaodong Li |
| Affiliation: | 1. CAS Key Laboratory of Mineralogy and Metallogeny, and Guangdong Provincial Key Laboratory of Mineral Physics and Materials, Guangzhou Institute of Geochemistry, Chinese Academy of Sciences (CAS), Guangzhou, People’s Republic of China;2. University of Chinese Academy of Sciences, Beijing, People’s Republic of China;3. Institute of High Energy Physics, Chinese Academy of Sciences, Beijing, People’s Republic of China |
| Abstract: | In situ X-ray diffraction and Raman scattering experiments using a diamond anvil cell revealed that Im-3-type KSbO3 remains stable up to 40.5?GPa with a bulk modulus K0?=?101.6 (7)?GPa. Rietveld structure refinements and mode Grüneisen parameters suggested that the stability mechanism of this three-dimensional cubic tunnel structure was attributed to the isotropic compression for all types of Sb–O bonding in the unit of SbO6 octahedron. Isotropic structure adjustment with external pressure reflected the nature that Im-3-type KSbO3 model structure has a high ionic tolerance with a change in the chemical pressure in the isomorphous substitutions. |
| Keywords: | KSbO3 pressure effect isomorphous substitutions synchrotron X-ray diffraction Raman scattering |