Reactivity toward oxygen and cation distribution in copper-manganese ferrite spinels fine powders

被引：23

作者：

Gillot, B ^{[1
]}

Nivoix, V ^{[1
]}

Kester, E ^{[1
]}

Nusillard, O ^{[1
]}

Villette, C ^{[1
]}

Tailhades, P ^{[1
]}

Rousset, A ^{[1
]}

机构：

[1] UNIV TOULOUSE 3, LAB CHIM MAT INORGAN, CNRS, URA 1311, F-31062 TOULOUSE, FRANCE

来源：

MATERIALS CHEMISTRY AND PHYSICS | 1997年 / 48卷 / 02期

关键词：

spinel; ferrites; oxidation; cation distribution;

D O I：

10.1016/S0254-0584(97)80103-4

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

The thermal behaviour of CuyMnxFe3-y-xO4 spinels (0 less than or equal to x less than or equal to 1, x + y approximate to 1) obtained at low temperature has been investigated over the temperature range of 50-700 degrees C mainly by thermogravimetry and infrared spectroscopy. Below 600 degrees C, Cu-Mn ferrites partly oxidized in cation deficient spinels, CuyMnxFe3-yO4+delta, showing an incomplete oxidation of the tetrahedral divalent manganese ions. A quantitative analysis by DTG based on an oxide-reduction mechanism and on a difference of reactivity of copper, iron and manganese ions in relation to the occupied site (octahedral or tetrahedral site) permits a cation distribution to be proposed. For x > 0.70, the vacancies were found to occupy octahedral sites with a vacancy cation ratio closely of 1/5 similar to gamma-Fe2O3. Subsequent oxidation of Mn2+ ions required higher temperature and was accompanied by a phase change.

引用

页码：111 / 118

页数：8

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