Semiconductor Physics, Quantum Electronics & Optoelectronics. 2013. V. 16, N 2. P. 146-151.
DOI: https://doi.org/10.15407/spqeo16.02.146/

                                                                 

Influence of cation substitution on phase transition and optical absorption edge in Cu6(P1-xAsx)S5I mixed crystals
I.P. Studenyak1, M. Kranjcec2, M.I. Kayla1, V.Yu. Izai1, A.F. Orliukas3

1Uzhhorod National University, Physics Faculty, 46, Pidhirna str., 88000 Uzhhorod, Ukraine
2University of Zagreb, Geotechnical Faculty, Hallerova Aleja 7, 42000 Varazdin, Croatia
3Vilnius University, Physics Faculty, Sauletekio al. 9, LT-10222 Vilnius, Lithuania E-mail:studenyak@dr.com

Abstract. Cu6(P1-xAsx)S5I mixed crystals were grown using chemical vapour transport. Temperature isoabsorption investigations of optical absorption edge enable to reveal anomalies typical for the first- and second-order phase transitions as well as to construct the x, T-diagram. The spectrometric measurements of the optical absorption edge in Cu6(P1-xAsx)S5I superionic mixed crystals were carried out within the temperature range 77-320 K. The influence of temperature and composition on optical absorption edge, parameters of exciton-phonon interaction as well as ordering-disordering processes in Cu6(P1-xAsx)S5I superionic mixed crystals have been studied.

Keywords: mixed crystals, absorption edge, Urbach rule, exciton-phonon interaction.

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