Microscopic theory of the electrocaloric effect in the paraelectric phase of potassium dihydrogen phosphate

Dunne, Lawrence J.; Valant, Matjaz; Manos, George; Axelsson, Anna-Karin; Alford, Neil
September 2008
Applied Physics Letters;9/22/2008, Vol. 93 Issue 12, p122906
Academic Journal
Here we present a microscopic theory of the electrocaloric effect in potassium dihydrogen phosphate, KH2PO4, based on Slater’s lattice model. The model reproduces the essential features of the experimentally observed behavior and also gives a remarkably accurate description of the electric field dependence of the electrocaloric effect. The basic principle of the theory also gives guidelines for a theoretical analysis of other dielectrics and for the further development of materials with an enhanced electrocaloric effect.


Related Articles

  • Two-dimensional low-frequency K[sub 4]LiH[sub 3](SO[sub 4])[sub 4] crystal lattice vibrations. Karpov, S. V.; Timofeev, K. V. // Physics of the Solid State;Mar97, Vol. 39 Issue 3, p470 

    Analyzes the two-dimensional low-frequency spectrum of potassium-lithium trihydrogen sulphate crystal lattice vibrations. Polarizations corresponding to the motions; Binding forces between the atoms within a layer; Elastic constants.

  • Structural response of KTiOPO4 to electric fields: Effects due to low frequency modulation. Hamichi, M.; Cousins, C. S. G.; Meads, R. E.; Sheldon, B. J.; Teat, S. J.; Thomas, P. A. // Journal of Applied Physics;7/1/1994, Vol. 76 Issue 1, p188 

    Presents a study which examined the structural response of potassium titanium oxygen phosphorus oxygen[sub4] to square-wave electric fields. Experimental details; Discussion of asymmetric Laue reflections; Interpretations.

  • Electrical Breakdown in Solid Dielectrics. Vorob'ev, G. A.; Ekhanin, S. G.; Nesmelov, N. S. // Physics of the Solid State;Jun2005, Vol. 47 Issue 6, p1083 

    The mechanism of electrical breakdown in solid dielectrics is analyzed using the results of our investigations performed in this direction over a period of several decades. It is shown that the electrical breakdown in solid dielectrics involves interrelated prebreakdown processes, such as...

  • Description of the low field nonlinear dielectric properties of ferroelectric and multiferroic materials. Borderon, C.; Renoud, R.; Ragheb, M.; Gundel, H. W. // Applied Physics Letters;3/14/2011, Vol. 98 Issue 11, p112903 

    Ferroelectric and multiferroic materials present a nonlinear variation in their permittivity due to domain wall motion. Currently, this variation is described either by the Rayleigh law for fields above a threshold or by a power law for soft ferroelectrics. We propose a hyperbolic law based on...

  • Nonlinear dielectric response in the mixed K(NH)HPO crystal. Korotkov, L.; Korotkova, T. // Physics of the Solid State;Feb2013, Vol. 55 Issue 2, p342 

    The influence of bias and variable electric fields on the dielectric response of the K(NH)HPO single crystal has been studied in the vicinity of the ferroelectric phase transition temperature T. Below T, the nonlinear response is caused mainly by the domain mechanism. This is confirmed, in...

  • Dielectric and enhanced pyroelectric properties of (Pb0.325Sr0.675)TiO3 ceramics under direct current bias field. Lei, Xiuyun; Dong, Xianlin; Mao, Chaoliang; Chen, Ying; Cao, Fei; Wang, Genshui // Applied Physics Letters;12/24/2012, Vol. 101 Issue 26, p262901 

    (Pb0.325Sr0.675)TiO3 (PST) ceramics were prepared by a traditional solid-state reaction technique. The dielectric and enhanced pyroelectric properties of PST ceramics were investigated under a DC bias field. The dielectric permittivity and dielectric loss of PST ceramics at Curie temperature...

  • Laser-induced bulk damage in potassium dihydrogen phosphate crystal. Singleton, M. F.; Cooper, J. F.; Andresen, B. D.; Milanovich, F. P. // Applied Physics Letters;3/14/1988, Vol. 52 Issue 11, p857 

    Potassium dihydrogen phosphate (KDP) is widely used for high-power laser frequency conversion. Its applications, however, are limited by a characteristically low laser damage threshold. This damage is associated with extrinsic impurity inclusions, whose exact nature has not been previously...

  • Effect of thermal annealing on the dielectric properties of KTiOPO4 single crystals. Satyanarayan, M. N.; Bhat, H. L.; Srinivasan, M. R. // Journal of Applied Physics;3/15/1996, Vol. 79 Issue 6, p3241 

    Depicts a study which investigated the dielectric properties of potassium titanyl phosphate as a function of thickness and frequency. Experimental procedure; Results and discussion; Conclusions.

  • Lead-free piezoelectric ceramics derived from the K0.5Na0.5NbO3–AgNbO3 solid solution system. Chao Lei; Zuo-Guang Ye // Applied Physics Letters;7/28/2008, Vol. 93 Issue 4, p042901 

    A lead-free solid solution between potassium sodium niobate and silver niobate, (1-x)K0.5Na0.5NbO3–xAgNbO3 (KNN-AN, with x=0–0.36), has been prepared in the form of ceramics by solid state reaction under O2 atmosphere. The crystal chemical study shows that Ag+ ion diffuses into the...


Read the Article


Sorry, but this item is not currently available from your library.

Try another library?
Sign out of this library

Other Topics