Study of dielectric properties and thermal variations of rochelle salt crystal

48-52Considering modified two sub lattice pseudo spin lattice coupled-mode model with third-and fourth-order phonon anharmonic terms and double-time Green’s function method Rochelle Salt has been investigated. Formulae for the shift, width, dielectric constant, soft mode frequency and loss tangent have been derived for Rochelle salt crystal. The numerical calculation has been done. Thermal variations of the above quantities have been obtained for Rochelle salt crystal. Our results have been compared with experimental results of other workers. Our results agree closely with those works