THERMAL-BEHAVIOR AND OXIDATION MECHANISM OF TETRAGONAL MANGANITE SPINELS CUXMN3-XO4, O LESS-THAN X LESS-THAN 1

被引：17

作者：

GILLOT, B ^{[1
]}

KHARROUBI, M ^{[1
]}

METZ, R ^{[1
]}

LEGROS, R ^{[1
]}

ROUSSET, A ^{[1
]}

机构：

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

来源：

JOURNAL OF SOLID STATE CHEMISTRY | 1991年 / 91卷 / 02期

关键词：

D O I：

10.1016/0022-4596(91)90093-W

中图分类号：

O61 [无机化学];

学科分类号：

070301 ; 081704 ;

摘要：

In the present work, the oxidation mechanism and cationic distribution of the single phase copper manganite spinels CuxMn3-xO4 (0 < x < 1) prepared by thermal processing of copper-manganese-coprecipitated hydroxide precursors have been investigated in the temperature range 300-900°C. Thermogravimetry measurements and infrared spectrometry have enabled us to propose copper and manganese ion distributions in the spinel lattice which are given by the formula (Cu+xMn2+1-x)A(Mn3+2-xMn4+)BO2-4 when the oxidation temperature is lower for Cu+ ions than that for Mn2+ ions. Further, isothermal oxidations achieved below 450°C showed, for composition x & 0.70, the formation of cation-deficient spinels with oxidation kinetics controlled by a diffusion law. With decreasing of copper content, the kinetic curves become sigmoidal according to nucleation growth-mechanism induced by the formation of α-Mn2O3. © 1991.

引用

页码：375 / 384

页数：10

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