Anomalous Temperature Dependences of the Band Gap and Thermal Expansion Coefficients in AgInSe2 Single Crystals

被引：0
|
作者：
Matiyev, A. Kh. [1 ,2 ]
机构：
[1] Ingush State Univ, Magas 386001, Ingushetia, Russia
[2] Millionshchikov State Oil Tech Univ, Grozny 364051, Chechnya, Russia
来源：
INORGANIC MATERIALS | 2023年 / 59卷 / 10期
关键词：
single crystal; lattice parameter; band gap; characteristic temperature; electron-phonon interaction; CHALCOPYRITE TYPE COMPOUNDS; LATTICE-DYNAMICS;
D O I：
10.1134/S0020168523100084
中图分类号：
T [工业技术];
学科分类号：
08 ;
摘要：
Temperature dependences of lattice parameters for AgInSe2 single crystals have been used to determine their thermal expansion coefficients along the a and c crystallographic axes. The results demonstrate that the thermal expansion coefficients of the AgInSe2 single crystals in the a- and c-axis directions change sign at temperatures of 142 and 135 K, respectively. Analysis of the temperature-dependent band gap of AgInSe2 with the use of optical absorption spectra shows that its band gap increases with increasing temperature in the range 80-120 K and decreases in the range 120-300 K.
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收藏
页码：1054 / 1059
页数：6
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