Please use this identifier to cite or link to this item: http://hdl.handle.net/10397/2478
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Title: Influence of thermal strains on the electrocaloric and dielectric properties of ferroelectric nanoshells
Authors: Dai, X
Cao, HX
Jiang, Q
Lo, VC
Issue Date: 1-Aug-2009
Source: Journal of applied physics, 1 Aug. 2009, v. 106, no. 3, 034103, p. 1-7
Abstract: The electrocaloric effect and dielectric tunability of BaTiO₃ferroelectric nanoshells on Si and MgO cores are investigated using the modified Landau–Ginzburg–Devonshire theory, in which the surface tension and thermal strain are taken into account. The numerical results exhibit a peak of electrocaloric coefficient near the critical nanoshell thickness accompanied with the size-driven phase transition. In addition to the enhanced adiabatic temperature difference, the compressive thermal strain also significantly improves the dielectric tunability. More importantly, the ferroelectric nanoshell displays pronounced electrocaloric effect: ΔT(Tm)=2.09 K for the nanoshell on Si core and ΔT(Tm)=2.33 K on MgO core, respectively. Essentially, the ferroelectric nanoshell provides an effective means to acquire good electrocaloric effect and high dielectric tunability by adjusting the wall thickness, core radius, annealing temperature, and various core materials, which may effectively contribute to the stress level in the ferroelectric nanoshell.
Keywords: Annealing
Barium compounds
Ferroelectric materials
Ferroelectric transitions
Magnesium compounds
Nanostructured materials
Pyroelectricity
Silicon
Stress effects
Surface tension
Publisher: American Institute of Physics
Journal: Journal of applied physics 
ISSN: 0021-8979
EISSN: 1089-7550
DOI: 10.1063/1.3186057
Rights: © 2009 American Institute of Physics. This article may be downloaded for personal use only. Any other use requires prior permission of the author and the American Institute of Physics. The following article appeared in Xiao Dai et al., J. Appl. Phys. 106, 034103 (2009) and may be found at http://link.aip.org/link/?jap/106/034103
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