Ellipsometric study of Ag6+x(P1-xSix)S5I single crystals. - Pogodin, A. I.; Pop, M. M.; Shender, I. O.; Filep, M. J.; Malakhovska, T. O.; Kokhan, O. P.; Skubenych, K. V.; Izai, V. (Semiconductor Physics, Quantum Electronics & Optoelectronics, 2025)