PREPARATION AND ELECTRICAL AND MAGNETIC-PROPERTIES OF SR2-XNAXCUO3 (0-LESS-THAN-OR-EQUAL-TO-X-LESS-THAN-OR-EQUAL-TO-1) SOLID-SOLUTIONS

被引:12
|
作者
SHIN, YJ [1 ]
MANOVA, ED [1 ]
DANCE, JM [1 ]
DORDOR, P [1 ]
GRENIER, JC [1 ]
MARQUESTAUT, E [1 ]
DOUMERC, JP [1 ]
POUCHARD, M [1 ]
HAGENMULLER, P [1 ]
机构
[1] UNIV BORDEAUX 1,CNRS,CHIM SOLIDE LAB,351 COURS LIBERAT,F-33405 TALENCE,FRANCE
来源
关键词
MIXED-VALENCE COPPER(II; III); OXIDE; SOLID SOLUTIONS; SEMICONDUCTING BEHAVIOR; ELECTRONIC STRUCTURE;
D O I
10.1002/zaac.19926161033
中图分类号
O61 [无机化学];
学科分类号
070301 ; 081704 ;
摘要
Mixed-valence copper(II/III) oxide solid solutions Sr2-xNaxCuO3 (0 less-than-or-equal-to x less-than-or-equal-to 1) have been prepared by solid-state reactions in oxygen atmosphere. All solid solutions exhibit the structure of Sr2CuO3 (S.G. Immm). Electrical conductivity and thermoelectric power measurements show a semiconducting behavior in the whole composition range. The electronic structure of Sr2CuO3 is compared with that of La2CuO4 on the basis of an iono-covalent model. Interpretation of transport properties suggests the formation of small polarons. Magnetic susceptibility and EPR measurements show that the antiferromagnetic ordering of Sr2CuO3 tends to vanish as x increases, however magnetic interactions are still strong for a concentration of Cu2+ ions corresponding to x = 0.8.
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页码:201 / 207
页数:7
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