Electrical properties of relaxor ferroelectric PMCT-PT-ZnO ceramic
Abstract
Polycrystalline samples of 0.85Pb[(Mg2/3Cd1/3)(1/3)Ta-2/3]O-3-0.15PbTiO(3) with 7.5% of ZnO having a tetragonal perovskite type structure have been prepared using high temperature solid-state reaction method. Dielectric studies indicate relaxor behaviour with diffuse phase transition. High value of epsilon(m) > 3000 is realized with T-m (phase transition temperature) at 43 degrees C at 1 kHz. Fitting of dielectric data using Vogel-Fulcher relationship indicates that the system is analogous to magnetic relaxation in spin-glass system with polarization fluctuations above a static freezing temperature. Cole-Cole analyses showed the non-Debye type relaxation in the system. The electrical conduction in the system may be due to the short-range translational hopping of charge carriers.
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