Affiliation:
1. Northwestern Polytechnical University
Abstract
Relaxor-based ferroelectrics, 0.65Pb(Mg1/3Nb2/3)O3-0.35PbTiO3 (PMN-PT) with a
pyrochlore-free phase, was prepared by a modified polymerized complex process. The reactive
columbite (MgNb2O6) phase was synthesized by the polymerized complex method at 1050oC for 4 h
with 3wt% excess MgO. Lead acetate and tetrebutyl titanate were used to synthesize pyrochlore-free
PMN-PT powder via the columbite route, from 800oC to 900oC, in air for 4 h. X-ray diffraction and
scanning electron microscopy were used to detect the perovskite phase evolution and the presence of
the pyrochlore phase in PMN-PT. The formation of perovskite PMN-PT is a function of the time and
temperature conditions of the precursor calcinations, and an optimum condition for the thermal
decomposition of the precursor was determined to avoid the formation of the pyrochlore phase.
Publisher
Trans Tech Publications, Ltd.
Subject
Mechanical Engineering,Mechanics of Materials,General Materials Science
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