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Microstrctural, vibrational, ferroelectric and dielectric propertiesinvestigation reveals non-stoichiometric chemical ordered regions (CORs) andrelaxor like dielectric characteristics in lead magnesium niobate (PMN)ceramics uniaxially hot pressed (HP) at 800 oC to 1200 oC. Occurance of (1/21/2 1/2) superlattice reflections along <111> in <110> zone axis SAED patternas well as the presence of bright nano-meter regions in correspondingdark-field images in 800 oC hot pressed PMN demonstrates formation of the CORsas soon as perovskite phase is formed during calcination and remains unaffectedwith HP sintering tempreature. Separation between two broad peaks of Nb-O-Nbstretching mode and the red-shift of O-B-O bending modes suggest an increase inthe polar nano-size regions. Grain size dependence of the em and shifting ofthe Tm from 278 K to 263 K is explained by the core-shell model. Polarizationswitching and impedance spectroscopy is observed to be consistent with thegrain size analysis.

Microstructural, vibrational, dielectric and ferroelectric properties correlation in hot-pressed PbMg1/3Nb2/3O3 ceramics