STRUCTURAL INVESTIGATION OF OXYGEN-DEFICIENT PEROVSKITE CAMNO2.75

被引：23

作者：

CHIANG, CCK ^{[1
]}

POEPPELMEIER, KR ^{[1
]}

机构：

[1] NORTHWESTERN UNIV,DEPT CHEM,EVANSTON,IL 60208

来源：

MATERIALS LETTERS | 1991年 / 12卷 / 1-2期

基金：

美国国家科学基金会;

关键词：

D O I：

10.1016/0167-577X(91)90066-F

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

Perovskite CaMnO3 and its oxygen-deficient derivatives have been prepared from solid solution precursor with a calcite-type structure. CaMnO3-x phases are constructed from MnO6 octahedra and MnO5 square pyramids. From X-ray powder data CaMnO2.75 was indexed on an orthorhombic cell with a = 5.35(1) angstrom, b = 20.96(2) angstrom and c = 7.47(1) angstrom. Rietveld refinement of time-of-flight neutron diffraction data was attempted for several models containing 50 mol% MnO5 and 50 mol% MnO6 based on MnO6 octahedra and MnO5 square pyramids, but the results were inconclusive. Simulation patterns illustrate the intrinsic difficulty for structural comprehension.

引用

页码：102 / 108

页数：7

共 27 条

[1]

[Anonymous], 1993, ELEMENTS XRAY DIFFRA

[2]

Bacon G.E., 1975, NEUTRON DIFFRACTION

[3]

BEYERLEIN RA, 1985, MATER SCI MONOGR B, V28, P863

[4] SR2MN2O5, AN OXYGEN-DEFECT PEROVSKITE WITH MN(III) IN SQUARE PYRAMIDAL COORDINATION [J].