Investigation of the electrocaloric effect in a PbMg2/3Nb1/3O3-PbTiO3 relaxor thin film

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Date
2009
Authors
Correia, T. M.
Young, J. S.
Whatmore, Roger W.
Scott, J. F.
Mathur, N. D.
Zhang, Q.
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AIP Publishing
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Abstract
Permittivity measurements of a 0.93PMN-0.07PT thin film show a broad maximum near 35 degrees C, and an anomaly at the depolarizing temperature T-d=18 degrees C on heating only, suggesting a dipolar glass-relaxor phase transition. No structural phase transition at 18 degrees C is apparent from ferroelectric hysteresis loops taken on field cooling and field heating. These loops show the thermal hysteresis expected for ferroelectric relaxors, which has not hitherto been experimentally verified in PbMg2/3Nb1/3O3-PbTiO3 thin films. Our data suggest the intriguing possibility of a giant electrocaloric effect (Delta T=9 K, Delta E=720 kV cm(-1)) at and near room temperature. (C) 2009 American Institute of Physics. (doi:10.1063/1.3257695)
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Keywords
Electromechanical properties , Ferroelectrics , Behavior , Niobate , Ceramics , Dielectric hysteresis , Ferroelectric thin films , Ferroelectric transitions , Lead compounds , Magnesium compounds , Pyroelectricity , Relaxor ferroelectrics , Permittivity , Lead zirconate titanate , Phase transitions , Dielectric thin films
Citation
Correia, T. M., Young, J. S., Whatmore, R. W., Scott, J. F., Mathur, N. D. and Zhang, Q. (2009) 'Investigation of the electrocaloric effect in a PbMg2/3Nb1/3O3-PbTiO3 relaxor thin film', Applied Physics Letters, 95(18), pp. 182904. doi: 10.1063/1.3257695
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© 2009 American Institute of Physics.This article may be downloaded for personal use only. Any other use requires prior permission of the author and AIP Publishing. The following article appeared in Correia, T. M., Young, J. S., Whatmore, R. W., Scott, J. F., Mathur, N. D. and Zhang, Q. (2009) 'Investigation of the electrocaloric effect in a PbMg2/3Nb1/3O3-PbTiO3 relaxor thin film', Applied Physics Letters, 95(18), pp. 182904 and may be found at http://aip.scitation.org/doi/abs/10.1063/1.3257695