RIETVELD REFINEMENT OF NA1.8BE0.9SI1.1O4 - AN IONIC CONDUCTOR WITH A CRISTOBALITE-RELATED STRUCTURE

被引：4

作者：

FROSTANG, S

GRINS, J

NYGREN, M

机构：

[1] Department of Inorganic Chemistry, Arrhenius Laboratory, University of Stockholm

来源：

SOLID STATE IONICS | 1990年 / 44卷 / 1-2期

关键词：

D O I：

10.1016/0167-2738(90)90043-Q

中图分类号：

O64 [物理化学（理论化学）、化学物理学];

学科分类号：

070304 ; 081704 ;

摘要：

The structure of the ionic conductor Na1.8Be0.9Si1.1O4 has been refined with the Rietveld Profile Refinement technique, based on X-ray powder diffraction data. The unit cell parameters were found to be a = 4.920, b = 9.876 and c = 13.922 angstrom. With space group symmetry Pcba assumed, the refinement yielded R(F) = 0.049 and R(wp) = 0.088. The cristobalite-related structure is built up of corner-shared [MeO4]-tetrahedra, with Me = Si and Be. The Si4+ and Be2+ ions are statistically distributed and the Na+ ions, located in the cavities formed by the tetrahedra, are found to be five- and four-coordinated. The findings are discussed in relation to the structure of Na2BeSiO4 and migration pathways for the Na+ ions.

引用

页码：51 / 54

页数：4

共 4 条

[1] IONIC-CONDUCTIVITY STUDIES AND PHASE-ANALYSIS OF THE NA2BESIO4-NA2BESI2O6 SYSTEM [J].