Temperature variation of electrical conductivity and absorption edge in Cu7GeSe5I advanced superionic conductor

被引：17
|
作者：
Studenyak, I. P. [1 ]
Kranjcec, M. [2 ]
Bilanchuk, V. V. [1 ]
Kokhan, O. P. [1 ]
Orliukas, A. F. [3 ]
Kezionis, A. [3 ]
Kazakevicius, E. [3 ]
Salkus, T. [3 ]
机构：
[1] Uzhgorod Natl Univ, UA-88000 Uzhgorod, Ukraine
[2] Univ Zagreb, Dept Geotech Engn, Varazhdin 42000, Croatia
[3] Vilnius Univ, Fac Phys, LT-10222 Vilnius, Lithuania
来源：
JOURNAL OF PHYSICS AND CHEMISTRY OF SOLIDS | 2009年 / 70卷 / 12期
关键词：
Inorganic compounds; Electrical conductivity; Optical properties; OPTICAL-ABSORPTION; ION CONDUCTORS; BR; ARGYRODITES; AG7GESE5I; RULE; CL;
D O I：
10.1016/j.jpcs.2009.09.003
中图分类号：
O6 [化学];
学科分类号：
0703 ;
摘要：
Single crystals of Cu7GeSe5I superionic conductor were grown by chemical transport. Their electrical conductivity in the frequency range 1.0 x 10(6)-1.2 x 10(9) Hz and in the temperature range 196-295 K was measured. Cu7GeSe5I crystal is shown to exhibit a rather high electrical conductivity (sigma(295)=64.0 S/m at 295 K) and a low activation energy (Delta E-a=0.125 eV). Optical absorption edge of Cu7GeSe5I crystals in the temperature range 77-300 K was studied, the temperature dependences of the optical pseudogap and Urbach energy being obtained. The effect of different types of disordering on the Urbach absorption edge and electron-phonon interaction parameters was investigated. (C) 2009 Elsevier Ltd. All rights reserved.
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收藏
页码：1478 / 1481
页数：4
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