Theory of Dielectric Susceptibility of RDP-ADP Mixed Crystals

Abstract

The cluster theory which is developed to describe the glassy phase of Rb 1- x (NH 4 ) x H 2 PO 4 is extended to explain the anomalous behaviour in the dielectric susceptibility χ of this phase. It is shown that χ begins to deviate from the normal value of the paraelectric phase at and below the glass transition temperature T g , and the deficient part of the susceptibility below T g is precisely proportional to the glass order parameter properly redefined.