Ferroelectric Phase Transition in Pb[(Mg3/4Zn1/4)1/3Nb2/3]O3 Ceramic

Pb[(Mg 3/4 Zn 1/4 ) 1/3 Nb 2/3 ]O 3 (PMZN) ceramic was prepared by columbite precursor method. The structural analysis revealed the cubic phase of PMZN at room temperature. Dielectric studies show the relaxor behaviour with diffuse phase transition. The transition temperature (T m ) was found to be at 40°C at 1 kHz. The frequency dependence T m has been modeled using Vogel-Fulcher relation. The dielectric relaxation in PMZN is found analogous to the magnetic relaxation in spin-glass system. The relaxor behaviour in PMZN has also been examined through admittance spectroscopy.