Investigation of glassy behaviour of flux grown Pb(Zn_(1/3)Nb _(2/3))_(0.91)Ti_(0.09)O_3 crystal

摘要

The glassy behaviour of flux grown single crystal of relaxor based lead zinc niobium titanate near its morphotropic phase boundary has been investigated. The frequency dependence of temperature at dielectric maxima (T′_m), which is governed by the production of polar nano-region at higher temperature, was analysed using different glass models and Power law. Various parameters like activation energy for relaxation, freezing temperature, relaxation frequency, etc. were determined after non-linear curve fitting. Further, the temperature dependence of dielectric constant, at temperatures much higher and lower than T_m, was analysed using two exponential functions to explain the degree of relaxation, production and freezing of polar regions, etc. Various other associated parameters are calculated by non-linear curve fitting and their significance has been explained.