Materials with layered structures XIII:: electrical and optical properties of layered chalcogenides in the system CoIn2S4-CoIn2Se4

被引：13
|
作者：
Memo, A [1 ]
Kwarteng-Acheampong, W [1 ]
Haeuseler, H [1 ]
机构：
[1] Univ Siegen, Anorgan Chem Lab, D-57068 Siegen, Germany
来源：
MATERIALS RESEARCH BULLETIN | 2003年 / 38卷 / 06期
关键词：
chlacogenides; layered compounds; chemical synthesis; X-ray diffraction; optical properties; phase equilibria;
D O I：
10.1016/S0025-5408(03)00079-5
中图分类号：
T [工业技术];
学科分类号：
08 ;
摘要：
The system CoIn2S4xSe4(1-x) has been investigated by X-ray powder methods on samples quenched at 700degreesC. The spinel type phase has a phase width of 1 greater than or equal to x greater than or equal to 0.9. A new layered compound is formed for 0.9 greater than or equal to x greater than or equal to 0.45 which crystallizes with the alpha-FeGa2S4-type with a = 392.6 pm and c = 1270.3 pm (x = 0.5) for the hexagonal cell. Platelike crystals of the layered phase are obtained by transport reactions with iodine in a temperature gradient 750 --> 700degreesC. The band gaps of these crystals measured by optical absorption vary from 1.2 to 1.4 eV. The electrical conductivities of the crystals are found in the order of 10(-5) Omega(-1) cm(-1). (C) 2003 Elsevier Science Ltd. All rights reserved.
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收藏
页码：1057 / 1061
页数：5
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