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Integrated Ferroelectrics
An International Journal
Volume 125, 2011 - Issue 1
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Original Articles

Aspects of the Electrocaloric Behavior of Ferroelectric Thin Films: A Review of the Predictions of the Landau-Ginzburg Theory

J. Zhang Materials Science and Engineering Program and Institute of Materials Science, University of Connecticut, Storrs, CT, 06269, USA
,
A. A. Heitmann Materials Science and Engineering Program and Institute of Materials Science, University of Connecticut, Storrs, CT, 06269, USA
,
S. P. Alpay Materials Science and Engineering Program and Institute of Materials Science, University of Connecticut, Storrs, CT, 06269, USA
&
G. A. Rossetti Jr. Materials Science and Engineering Program and Institute of Materials Science, University of Connecticut, Storrs, CT, 06269, USA
Pages 168-175 | Received 14 Sep 2010, Accepted 08 Nov 2010, Published online: 27 Jun 2011
 
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Abstract

A thermodynamic model is used to investigate the electrocaloric response of thin film perovskite ferroelectrics under the influence of differing electrical, thermal and mechanical boundary conditions including bias and driving field, temperature, lateral clamping and misfit strain. A comparison of the electrothermal properties of ferroelectric solid solutions comprised of BaTiO3, PbTiO3 and/or SrTiO3 illustrates the influence of composition on electrocaloric properties. Computations made for (001) textured polycrystalline BaTiO3 films on IC-friendly substrates quantify the effects of thermal stresses. The combined results provide insights concerning how the deposition temperature, substrate material and composition can be adjusted to obtain desired electrocaloric response.

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