CU-4(ASO4)(2)(O) - A NEW COPPER ARSENATE WITH UNUSUAL LOW-TEMPERATURE MAGNETIC-PROPERTIES

被引：13
作者：
ADAMS, RD [1 ]
LAYLAND, R [1 ]
PAYEN, C [1 ]
机构：
[1] INST MAT NANTES, F-44072 NANTES 03, FRANCE
来源：
INORGANIC CHEMISTRY | 1995年 / 34卷 / 22期
关键词：
D O I：
10.1021/ic00126a002
中图分类号：
O61 [无机化学];
学科分类号：
070301 ; 081704 ;
摘要：
The new copper oxide orthoarsenate, Cu-4(AsO4)(2)O, was obtained from a mixture CuO and As2O5 . xH(2)O in a BaCO3 heated to 1090 degrees C. The material contains two copper ions in distorted trigonal bipyramidal CuO5 geometries with a third copper ion in a distorted square pyramidal CuO5 geometry. The free ''oxide'' ion is surrounded by four copper ions in a distorted tetrahedral arrangement. The copper ions form. extended two dimensional layers via a network of Cu-O-Cu bridges. The layers are interconnected via Cu-O-As-O-Cu bridging units. Magnetic susceptibility measurements show significant antiferromagnetic coupling of the unpaired electrons and an unusual transition into a weak ferromagnetic state in the temperature range 15-25 K.
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页码：5397 / +
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