Title :
Electrocaloric response of the ferroelectrics
Author :
Akcay, G. ; Alpay, S.P. ; Mantese, J.V. ; Rossetti, G.A. ; Scott, J.F.
Author_Institution :
Materials Science and Engineering Program and Institute of Materials Science, University of Connecticut, Storrs, 06269, USA
Abstract :
Monodomain contributions to the electrocaloric effect in mechanically free (bulk) and laterally strained (thin film) BaTiO3 are computed using a thermodynamic analysis. We 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 [Science 311, 1270 (2006)]. It is also demonstrated that the magnitude, the temperature-dependence and the maxima temperature (where the effect is maximum) of the electrocaloric response can be modified as a function of misfit strain.
Keywords :
Capacitive sensors; Dielectric substrates; Dielectric thin films; Ferroelectric materials; Internal stresses; Iron; Materials science and technology; Piezoelectric films; Polarization; Temperature;
Conference_Titel :
Applications of Ferroelectrics, 2008. ISAF 2008. 17th IEEE International Symposium on the
Conference_Location :
Santa Re, NM, USA
Print_ISBN :
978-1-4244-2744-4
Electronic_ISBN :
1099-4734
DOI :
10.1109/ISAF.2008.4693768
