A SINGLE-CRYSTAL NEUTRON-DIFFRACTION STUDY OF THE DISTRIBUTION AND THERMAL MOTION OF SILVER IONS IN ALPHA-AG3SI AND BETA-AG3SI

被引：32

作者：

DIDISHEIM, JJ

MCMULLAN, RK

WUENSCH, BJ

机构：

[1] MIT,DEPT MAT SCI & ENGN,CAMBRIDGE,MA 02139

[2] BROOKHAVEN NATL LAB,DEPT CHEM,UPTON,NY 11973

来源：

SOLID STATE IONICS | 1986年 / 18-9卷

关键词：

ELECTRIC CONDUCTIVITY - Mathematical Models - NEUTRONS - Diffraction - SILVER COMPOUNDS - Electric Conductivity;

D O I：

10.1016/0167-2738(86)90325-5

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：

Single-crystal neutron diffraction data have been used to examine the distribution of mobile Ag** plus ions in anion-ordered beta -Ag//3Si and anion-disordered alpha -Ag//3Si at 8 temperatures in the overall range 23 degree to 475 degree C. The Ag density in the beta -phase is confined to a cluster of four tetrahedral sites grouped at the centers of the cell faces, closely spaced as a result of the different distances between Ag** plus and the two species of anion. The individual sites are not resolved in Fourier syntheses because of large thermal displacements within a flat potential well, but the refinements permit rejection of occupancy of the octahedral site. The Ag** plus distribution in alpha -Ag//3Si displays a 2-coordinated site on the body diagonal of the cell.

引用

页码：1150 / 1162

页数：13

共 20 条

[1] DYNAMICS OF SILVER IONS IN THE SUPERIONIC CONDUCTOR AG3SI [J].