期刊
PHYSICA B-CONDENSED MATTER
卷 406, 期 6-7, 页码 1317-1322出版社
ELSEVIER
DOI: 10.1016/j.physb.2011.01.024
关键词
Nanoparticle; Core-shell; Ferroelectric; Dielectric
A quantitative core-shell structure model on the grain size effect of nano-BaTiO3 ceramics has been proposed on the basis of the Ginsburg-Landau-Devonshire thermodynamic theory. In this study, we have considered the existence of surface effects, which leads to the core-shell structure in BaTiO3 nanoparticles consisting of inner tetragonal core, gradient lattice strain layer, and surface cubic layer. The size effects on the spontaneous polarization, Curie temperature, c/a ratio, and electrocaloric and dielectric properties of BaTiO3 ferroelectric nanoparticle are successfully explained. Theoretical and experimental results for BaTiO3 nanoparticle are compared and discussed. (C) 2011 Elsevier B.V. All rights reserved.
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