COMPOSITION AND CATION VACANCY DISTRIBUTION OF CATION-DEFICIENT MN/FE SPINEL OXIDES

被引：18

作者：

MATEOS, JMJ ^{[1
]}

JONES, W ^{[1
]}

MORALES, J ^{[1
]}

TIRADO, JL ^{[1
]}

机构：

[1] UNIV CAMBRIDGE,DEPT CHEM,CAMBRIDGE CB2 1EW,ENGLAND

来源：

JOURNAL OF SOLID STATE CHEMISTRY | 1991年 / 93卷 / 02期

关键词：

D O I：

10.1016/0022-4596(91)90318-C

中图分类号：

O61 [无机化学];

学科分类号：

070301 ; 081704 ;

摘要：

Chemical composition and vacancy ditribution are studied in cation-deficient Mn Fe spinel oxides of general formula Fe3-xMnxO4+y prepared by the thermal decomposition of mixed carbonates. An oxygen/metal ratio in the 1.5-1.6 range is found for samples obtained at 400°C in an air atmosphere. In addition, a significant content of Mn(IV) ions can be derived from chemical and XRD data. The Mössbauer data of these samples reveal the effects of small particle size as well as isolating effects of the Fe(III) ions in B sites by A-site cation vacancies. These effects increase with Mn content. For samples prepared at 600°C, the XRD data and Mössbauer data are interpreted in terms of a higher particle size and lower vacancy content than those found at 400°C. At both temperatures, the cation vacancies found in B-sites are ordered in a γ-Fe2O3-type superstructure when the Mn content is lower than 0.6. © 1991.

引用

页码：443 / 453

页数：11

共 32 条

[1]

[Anonymous], [No title captured]

[2] MICROSTRUCTURE, RELAXATION, AND PRINT-THROUGH IN GAMMA-FE2O3 PARTICLES [J].