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Abstract
Vibrational properties of superionic crystals with fluorite structure Ba 1−x R x F 2+x x (R = La, Nd) = were studied using infrared spectroscopy, Raman scattering and inelastic neutron scattering. Selected spectra were measured on heating as a function of temperature. Their main features are: (a) peaks due to translational symmetry breaking, (b) low-frequency modes assigned to localized vibrations of clusters of defects, (c) peaks connected to the presence of small regions with tysonite-like structure (RF3) at higher doping rates.