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Magnitude of the intrinsic electrocaloric effect in ferroelectric perovskite thin films at high electric fields
 

Summary: Magnitude of the intrinsic electrocaloric effect in ferroelectric perovskite
thin films at high electric fields
G. Akcay and S. P. Alpaya
Materials Science and Engineering Program and Institute of Material Science, University of Connecticut,
Storrs, Connecticut 06269
J. V. Mantese
United Technologies Research Center, East Hartford, Connecticut 06108
G. A. Rossetti, Jr.
Institute of Materials Science, University of Connecticut, Storrs, Connecticut 06269
Received 11 May 2007; accepted 30 May 2007; published online 22 June 2007
Monodomain contributions to the electrocaloric effect in mechanically free bulk and laterally
clamped thin film BaTiO3 are computed using a thermodynamic analysis. The authors show that
the intrinsic electrocaloric coefficient at electric fields sufficient to destroy the discontinuous
ferroelectric phase transition results in an adiabatic temperature change of 8 K that agrees closely
with the giant value of 12 K recently observed experimentally for lead zirconate titanate thin films
A. S. Mischenko et al., Science 311, 1270 2006 . Perfect lateral clamping transforms the
discontinuous transition into a continuous transition, which decreases the magnitude of the
electrocaloric effect by 20% but reduces its sensitivity to temperature. 2007 American Institute of
Physics. DOI: 10.1063/1.2750546
The electrocaloric EC effect is a coupling between

  

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

 

Collections: Materials Science