STUDY OF CALCIUM CHROMIUM IRON-OXIDES BY EXTENDED X-RAY ABSORPTION FINE-STRUCTURE SPECTROSCOPY

被引：8

作者：

GIBB, TC

机构：

来源：

JOURNAL OF MATERIALS CHEMISTRY | 1992年 / 2卷 / 01期

关键词：

EXAFS SPECTROSCOPY; XANES SPECTROSCOPY; DEFECT ORDERING; CHROMIUM; STRUCTURAL INTERGROWTH;

D O I：

10.1039/jm9920200105

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：

Chromium K-edge EXAFS and XANES measurements for several high-temperature phases in the Ca2Cr(x)Fe(2-x)O5+y system have established that there are substantial numbers of chromium atoms with either short (ca. 1.68 angstrom) or long (ca. 1.88 angstrom) distances to oxygen. These can be attributed to Cr6+ ions in tetrahedral co-ordination and Cr3+ ions in octahedral co-ordination, respectively. The results are correlated with earlier X-ray and Mossbauer data, and support the description of these materials as intergrowths of brownmillerite-related ordered vacancy structures. They differ significantly from the corresponding strontium materials.

引用

页码：105 / 110

页数：6

共 7 条

[1] AN INVESTIGATION OF NON-STOICHEIOMETRY IN THE SYSTEMS SRFEO3-Y AND SRCOO3-Y BY IRON AND COBALT K-EDGE EXTENDED X-RAY ABSORPTION FINE-STRUCTURE SPECTROSCOPY [J].