Study of Ferroelectric Phase Transition in Triglycine Selenate Crystal

Triglycine selenate (TGSe) is a Hydrogen bondend order disorder type ferroelectric, which go through a structural phase transition at Tc=295K. TGSe is very similar to the Triglycine Sulphate crystal, which is extensively used in infrared detection. In the present paper we are using double time thermal Green’s function method and modified pseudospin model to discuss ferroelectric behavior of TGSe crystal. Expressions for shift, width, soft mode frequency, dielectric constant, loss and transition temperature have been evaluated. By fitting model values of physical quantities in the theoretical expressions thermal dependence of soft mode frequency, dielectric constant and loss have been calculated in the vicinity of transition temperature. Theoretical results are in well agreement with experimental results of other researchers.