Electrical behaviour of 0.80Pb[(Mg,Zn)1/3Ta2/3]O 3-0.20PbTiO3 relaxor
Abstract
Polycrystalline 0.80Pb[(Mg2/3Zn1/3)(1/3)Ta-2/3]O-3-0.20PbTiO(3) (PMZT-PT) having a tetragonal perovskite type structure was prepared by the high temperature solid-state reaction method. Dielectric studies showed the relaxor behaviour with diffuse phase transition. High value of epsilon(m) > 8000 was realized with T-m (phase transition temperature) at 57 degrees C at 1 kHz. The frequency dependence of T-m has been modeled using Vogel Fulcher relation. The dielectric relaxation in the present system was found analogous to the magnetic relaxation in spin-glass system. Complex impedance analysis indicated the system undergoing a polydispersive non-Debye type dielectric relaxation. The relaxation behaviour in PMZT-PT was also probed through admittance spectroscopy.
URI
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