Diffuse Phase Transition In Non-Stoichiometric LiRbSO4 Crystals

Abstract

The influence of changing the ratio of Li2S04 on the structure transition of (RbxLi1-x)2S04 , LRS crystals, where x ranged from 0.1 to 0. 7, was studied by thermal analysis techniques in the temperature range 300 - 600 K. Multiple peaks in the DT A traces were observed for crystals having x = 0.1 and x = 0.2. The values of CP decreased while that ofT, increased with increasing Rb+ content. The excess of the specific heat for LRS crystals showed a broadening in the temperature dependence especially for samples enriched with Rb+. These results could be considered on the development of the ordering of SO4 and Li04 and in their arrangement.