Semiconductor Physics, Quantum Electronics & Optoelectronics, 29 (1), P. 028–035 (2026).
DOI: https://doi.org/10.15407/spqeo29.01.028

Structure–property relationships in Ag_6+x(P_1xSi_x)S₅I argyrodite-type solid solutions

A.I. Pogodin^1*, M.J. Filep², I.O. Shender¹, T.O. Malakhovska¹, O.P. Kokhan¹, V. Izai<sup>3

1</sup>Uzhhorod National University, 46 Pidhirna Street, 88000 Uzhhorod, Ukraine
²Ferenc Rakoczi II Transcarpathian Hungarian University, 6 Kossuth Square, 90200 Beregovo, Ukraine
³Comenius University, Mlynska dolina, Bratislava 84248, Slovakia
*Corresponding author e-mail: artempogodin88@gmail.com

Abstract. In this work, single crystals of solid solutions Ag_6.25P_0.75Si_0.25S₅I and Ag_6.75P_0.25Si_0.75S₅I were obtained and studied. The synthesis was carried out using a one-temperature method, and the crystals were grown by directional crystallization from a melt. The crystal structure was investigated using X-ray diffraction with Rietveld refinement. It was established that the compounds crystallize in space group F-43m with lattice parameters a = 10.549 and 10.604 . Electrical properties studied by impedance spectroscopy revealed predominantly ionic conductivity, exceeding the electronic contribution by four orders of magnitude. Increasing silicon content enhances ionic conductivity up to 10² S/cm and reduces activation energy. These effects are attributed to changes in the crystal structure and mobility of Ag⁺ ions.

Keywords: argyrodite, single crystal, ionic conductivity, solid solutions.

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