Motsnyi, F.V.; Vuychik, M.V.; Smolanka, O.M.; Peresh, E.Yu.
(Functional Materials, 2005)
Raman scattering in unpolarized light has been studied for the first time for Cs₃Bi₂I₉ layered ferroelastic at temperatures from 5 to 300 К in the heating mode. Neither soft mode nor frequency softening was ...