Time Dependence of the α-β Phase Transition in (Rb1-xCsx)2CdBr4

The mixed system of (Rb1-xCsx)2CdBr4 was synthesized by Bridgman method. The initial member (x = 0) Rb2CdBr4 transforms at 485 K from low temperature α-phase to high temperature β-phase. This α-β phase transition shows a strong nature of the first order phase transition and the β-phase can be supercooled very easily. The supercooling properties of β-phase were investigated by differential thermal analysis (DTA) and dielectric constant measurements. The concentration dependence of the α-β phase transition point Tα-β and the melting point Tm were obtained over full range of x.