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Influence of thermal stresses on the electrocaloric properties of ferroelectric films
 

Summary: Influence of thermal stresses on the electrocaloric properties of
ferroelectric films
J. Zhang, S. P. Alpay,a
and G. A. Rossetti, Jr.
Materials Science and Engineering Program and Institute of Materials Science, University of Connecticut,
Storrs, Connecticut 06269, USA
Received 15 February 2011; accepted 12 March 2011; published online 1 April 2011
A nonlinear thermodynamic theory is used to analyze the influence of thermal stresses on
electrocaloric EC properties of 001 -textured polycrystalline monodomain BaTiO3,
Ba0.6Sr0.4TiO3, and PbTiO3 films on integrated circuit-compatible substrates Si, c-sapphire, and
a-sapphire. The results show that the EC response can depend strongly on the film growth
temperature TG which can shift the maximum in EC properties to a working temperature of interest.
For BaTiO3 films on Si, the thermal stresses are sufficient to shift the zero-field Curie temperature
TC near to room temperature, resulting in a strong enhancement of the EC properties as compared
to the bulk material. 2011 American Institute of Physics. doi:10.1063/1.3573788
The electrocaloric EC effect results from the coupling
between the electrical and thermal properties of a dielectric
solid wherein an adiabatic change in temperature T is
produced in response to a change in the applied electric field
E . EC and pyroelectric effects are described by the same

  

Source: Alpay, S. Pamir - Department of Materials Science and Engineering, University of Connecticut

 

Collections: Materials Science