TY  - JOUR
T1  - Ellipsometric study of Ag6+x(P1-xSix)S5I single crystals
AU  - Pogodin, A.I.
AU  - Pop, M.M.
AU  - Shender, I.O.
AU  - Filep, M.J.
AU  - Malakhovska, T.O.
AU  - Kokhan, O.P.
AU  - Skubenych, K.V.
AU  - Izai, V.
JO  - Semiconductor Physics, Quantum Electronics & Optoelectronics
VL  - 28
IS  - 2
SP  - 215
EP  - 220
PY  - 2025
DO  - 10.15407/spqeo28.02.215
UR  - https://doi.org/10.15407/spqeo28.02.215
AB  - Single crystals of Ag6+x(P1-xSix)S5I (x = 0, 0.25, 0.5, 0.75, 1) solid solutions were grown by directional crystallization from the melt. Grown crystals were investigated using XRD and spectral ellipsometry. Ag6+x(P1-xSix)S5I crystals are characterized by formation of a continuous series of solid solutions with a cubic F-43m structure. The studied samples had a nonlinear spectral dependence of the refractive index n and the extinction coefficient k. The presence of a sharp maximum of n and a rather sharp decrease in the k spectral dependences are observed within the 570...730 nm range. The spectral dependence of the refractive index was described by the single-oscillator Wemple-DiDomenico (WD) model. Parameters of the Wemple-DiDomenico model for Ag6+x(P1-xSix)S5I single crystals were determined. The effect of heterovalent cationic Р+5 → Sі+4 substitution on parameters of the Wemple–DiDomenico model was discussed.
KW  - argyrodite
KW  - single crystal
KW  - refractive index
KW  - band gap
ER  -