Issue 6, 2011

Synthesis and thermochemistry of relaxor ferroelectrics in the lead magnesium niobate–lead titanate (PMN–PT) solid solutions series

Abstract

The energetics of the (1 − x)PMNxPT solid solutions have been investigated using high temperature oxide melt solution calorimetry in 3Na2O·4MoO3solvent at 702 °C. The solid solutions show positive heats of mixing, reflecting the changes in structure from cubic to tetragonal to monoclinic and the morphotropic phase transition. The synthesis of a perovskite phase without a secondary pyrochlore phase depends on the annealing temperature and time. The enthalpies of reactions involved in synthesis and decomposition of the PMN perovskite were measured for the first time by oxide melt solution calorimetry. The decomposition of perovskite to pyrochlore plus MgO and PbO is energetically favorable, as is the formation of perovskite from columbite and lead oxide.

Graphical abstract: Synthesis and thermochemistry of relaxor ferroelectrics in the lead magnesium niobate–lead titanate (PMN–PT) solid solutions series

Article information

Article type
Paper
Submitted
15 Sep 2010
Accepted
27 Oct 2010
First published
08 Dec 2010

J. Mater. Chem., 2011,21, 1837-1845

Synthesis and thermochemistry of relaxor ferroelectrics in the lead magnesium niobate–lead titanate (PMN–PT) solid solutions series

G. C. Cardoso da Costa, L. Wu and A. Navrotsky, J. Mater. Chem., 2011, 21, 1837 DOI: 10.1039/C0JM03090B

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