Phase transitions and vibrational study of (Cs3.5Rb0.5)[(Se0.85S0.15)O3]2[Te(OH)6]3 material

► We have characterized the phase transition observed in DSC curve of the new mixed compound (Cs3.5Rb0.5)[(Se0.85S0.15)O3]2[Te(OH)6]3. ► The protonic conduction in our material is probably due to a hopping mechanism. ► We have undertaken a Raman and IR study, in order to gain more information on the crystal of (Cs3.5Rb0.5)[(Se0.85S0.15)O3]2[Te(OH)6]3 dynamics, on the degree of disorder in the different phases and the mechanisms involved in the transitions.