Semiconductor Physics, Quantum Electronics & Optoelectronics, 24 (1), P. 26-33 (2021).
DOI: https://doi.org/10.15407/spqeo24.01.026

Crystal structure and electrical properties of Ag6PS5I single crystal
I.P. Studenyak 1* , A.I. Pogodin 1 , M.J. Filep 1,2 , O.P. Kokhan 1 , O.I. Symkanych 1 , M. Timko 3 , P. Kopčanský 3


1 Uzhhorod National University, 46, Pidhirna str., 88000 Uzhhorod, Ukraine
2 Ferenc Rákóczi II Transcarpathian Hungarian Institute,
Kossuth Sq. 6, Beregovo 90200,Ukraine
3 Institute of Experimental Physics, Slovak Academy of Sciences
47, Watsonova str., 04001 Košice, Slovakia
*Corresponding author, e-mail: studenyak@dr.com

Abstract. The single crystals of quaternary halogen Ag6PS5I were grown from the solution–melt by means of a vertical zone crystallization method. The crystal structure has been ascertained using the Rietveld method. Investigation of electrical conductivity was carried out using the impedance spectroscopy technique within the frequency range 1·101 – 3·105 Hz and temperature interval 293–383 K on gold contacts applied by chemical deposition from solution. Ionic (1.79·10-3 S/cm) and electronic (1.64·10-6 S/cm) components of electrical conductivity have been determined using the Nyquist plots. The mechanism of ionic conductivity for Ag6PS5I single crystal has been proposed which can be considered as ion diffusion through “channels” Ag2–Ag2.

Keywords: argyrodite, superionic conductor, single crystal, impedance spectroscopy, electrical conductivity, crystal structure.

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