AN IR SPECTROSCOPIC INVESTIGATION OF COPPER MANGANITE CUXMN3-XO4 (0-LESS-THAN-X-LESS-THAN-1) SPINELS AND THEIR OXIDATION-PRODUCTS

被引：14
|
作者：
KHARROUBI, M [1 ]
GILLOT, B [1 ]
LEGROS, R [1 ]
METZ, R [1 ]
VAJPEI, AC [1 ]
ROUSSET, A [1 ]
机构：
[1] UNIV TOULOUSE 3,CHIM MAT INORGAN LAB,F-31062 TOULOUSE,FRANCE
来源：
JOURNAL OF THE LESS-COMMON METALS | 1991年 / 175卷 / 02期
关键词：
D O I：
10.1016/0022-5088(91)90013-T
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：
The IR absorption spectra of tetragonal copper manganite CuxMn3-x(O4) spinels (O < x < 1) have singled out a discontinuity in cation distribution to occur at x > 0.60 in conformity with that recorded by our previous measurements and have warranted the existence of a more complex cation distribution than that proposed earlier. It has been concluded from this study that the ionic configuration for x < 0.60, i.e. (Cux+-Mn1-x2+)A(Mn2-x3+ Mnx4+)BO4(2)-, changes for x > 0.60 to (Cux-y+Mn1-x+y2+)A(Cuy2+Mn2-x-y3+Mnx4+)(B)O4(2-), where y represents a low value (less than 0.20). When the oxidation of Mn2+ and Cu+ ions is achieved below 450-degrees-C, IR absorption measurements confirm the formation of a cation-deficient metastable spinel phase Cu1.5Mn1.5O4+delta with a 1:3 octahedral superstructure.
引用
收藏
页码：279 / 287
页数：9
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