@article{Pogodin2025_215,
  author = {Pogodin, A.I. and Pop, M.M. and Shender, I.O. and Filep, M.J. and Malakhovska, T.O. and Kokhan, O.P. and Skubenych, K.V. and Izai, V.},
  title = {Ellipsometric study of Ag6+x(P1-xSix)S5I single crystals},
  journal = {Semiconductor Physics, Quantum Electronics \& Optoelectronics},
  year = {2025},
  volume = {28},
  number = {2},
  pages = {215--220},
  doi = {10.15407/spqeo28.02.215},
  url = {https://doi.org/10.15407/spqeo28.02.215},
  abstract = {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.},
  keywords = {argyrodite, single crystal, refractive index, band gap}
}