STRUCTURAL AND ELECTRONIC-PROPERTIES OF THE MIXED CO RU PEROVSKITES AA'CORUO6 (A, A'=SR, BA, LA)

被引:83
作者
KIM, SH [1 ]
BATTLE, PD [1 ]
机构
[1] UNIV OXFORD, INORGAN CHEM LAB, OXFORD OX1 3QR, ENGLAND
关键词
D O I
10.1006/jssc.1995.1025
中图分类号
O61 [无机化学];
学科分类号
070301 ; 081704 ;
摘要
The compounds Sr2CoRuO6, SrLaCoRuO6, Ba2CoRuO6, and BaLaCoRuO6 have been prepared and characterized by X ray powder diffraction and SQUID magnetometry. All but Ba2CoRuO6 crystallize as pseudo-cubic perovskites with a disordered arrangement of Co and Ru cations over the six-coordinate sites. Ba2CoRuO6 adopts the hexagonal 6H perovskite structure with Co in the vertex-sharing octahedra and a random arrangement of Co and Ru in the M(2)O(9) dimers. Frustration is apparent in the magnetic properties of each of these compounds at low temperatures, in contrast to the 6H perovskite Ba3CoRu2O9, which shows no structural disorder and orders antiferromagnetically at 106 K. (C) 1995 Academic Press, Inc.
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页码:174 / 183
页数:10
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