Open AccessAnomalous character of temperature dependences of some AgInSe2 parameters AgInSe2
Author(s) -
A. Kh. Matiev,
R.T. Uspazhiev,
B. M. Khamkhoev,
Z. Torshkhoeva,
L. Blagina,
A.M. Gachaev,
L. Martazanova,
R. Evteeva
Publication year - 2020
Publication title -
iop conference series. materials science and engineering
Language(s) - English
Resource type - Journals
eISSN - 1757-899X
pISSN - 1757-8981
DOI - 10.1088/1757-899x/905/1/012046
Subject(s) - thermal expansion , sign (mathematics) , character (mathematics) , condensed matter physics , spectral line , thermal , crystal structure , lattice (music) , band gap , materials science , crystal (programming language) , chemistry , crystallography , thermodynamics , physics , quantum mechanics , mathematical analysis , geometry , mathematics , acoustics , metallurgy , computer science , programming language
Based on the experimental and X-ray studies of the absorption spectra and the temperature dependence of the crystal lattice parameters of AgInSe2 single crystals and the coefficients of thermal expansion along the corresponding crystallographic directions were calculated. It was found that the thermal expansion of AgInSe2 crystals along the a and c axes changes its sign at a temperature of 142.31 and 135, 14 K, respectively. The anomalous nature of the band gap width AgInSe2 was established.