Electric field dependence of Curie temperature in Ba_xSr₁_-xTiO₃ ferroelectric perovskites

126-131Electric field dependence of Curie temperature in an anharmonic poly crystalline mixture of BaxSr1-xTiO3 has been calculated in its paraelectric phase from the Silverman-Joseph-Hamiltonian augmented with fourth-order phonon coordinates using double time Green’s functions technique. The field and impurity dependence of the shift in the Curie temperature has been studied. The Curie temperature increases linearly with increase of the external electric field and impurity concentration(x) in the BaxSr1-xTiO3 ferroelectric perovskites. It follows the Curie-Weiss law above the transition temperature in the paraelectric region. The results are in good agreement with previous experimental and theoretical resul