Semiconductor Physics, Quantum Electronics & Optoelectronics, 24 (3), P. 241-247 (2021).
DOI: https://doi.org/10.15407/spqeo24.03.241-247

Electrical properties of cation-substituted Ag7(Si1-xGex)S5I single crystals
I.P. Studenyak 1*, A.I. Pogodin1, I.A. Shender1, M.J. Filep12, O.P. Kokhan1, P. Kopčanský3

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

Abstract. High-quality single crystals of Ag7(Si1–xGex)S5I (x = 0.2, 0.4, 0.6, 0.8) solid solutions are grown from the solution–melt by vertical zone crystallization method. The measurements of electrical conductivity of Ag7(Si1–xGex)S5I solid solutions were performed using the impedance spectroscopy method within the frequency range from 10 Hz up to 2·106 Hz and temperature interval 293–383 K. Ionic and electronic components of electrical conductivity, as well as their ratios, were determined using the Nyquist plots.

Keywords:argyrodites, crystal structure, superionic conductors, cationic substitution, electrical conductivity.

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