Diffuse reflectance spectroscopy of solid solutions in the Ag7PS6-Ag8GeS6 system. - Malakhovska, T. O.; Pogodin, A. I.; Filep, M. J.; Studenyak, Ya. I.; Kokhan, O. P.; Zubaka, O. V.; Izai, V. Yu.; Kúš, P. (Semiconductor Physics, Quantum Electronics & Optoelectronics, 2023)