NEUTRON-DIFFRACTION STUDY OF THE BROWN PHASE BAND2CUO5

被引：34

作者：

STALICK, JK

WONGNG, W

机构：

[1] Materials Science and Engineering Laboratory, National Institute of Standards and Technology, Gaithersburg

来源：

MATERIALS LETTERS | 1990年 / 9卷 / 10期

关键词：

D O I：

10.1016/0167-577X(90)90074-V

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

A neutron Rietveld refinement study of the "brown phase" BaNd2CuO5 shows that this material is isostructural with the La analog, but adopts a totally different structure from that of the "green phase" BaR2CuO5 formed for R = Y and most lanthanide elements. BaNd2CuO5 is tetragonal, space group P4/mbm(126), with Z=2 and refined cell parameters a = 6.7015(1) and c=5.8211 (1) Å. The BaNd2CuO5 framework is built from edge- and face-sharing BaO10 and NdO8 polyhedra, while in the green phase structure the smaller R3+ ion is surrounded by seven oxygen atoms. The square-planar CuO4 groups are isolated in the structure. © 1990.

引用

页码：401 / 404

页数：4

共 13 条

[1] STUDY BY NEUTRON-DIFFRACTION OF HIGH-TEMPERATURE STRUCTURES OF LA2O3 AND ND2O3 [J].