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Title: Electrocaloric properties of ferroelectric-paraelectric superlattices controlled by the thickness of paraelectric layer in a wide temperature range

As functions of the paraelectric layer thickness, misfit strain and temperature, the electrocaloric properties of ferroelectric-paraelectric superlattices are investigated using a time-dependent Ginzburg-Landau thermodynamic model. Ferroelectric phase transition driven by the relative thickness of the superlattice is found to dramatically impact the electrocaloric response. Near the phase transition temperature, the magnitude of the electrocaloric effect is maximized and shifted to lower temperatures by increasing the relative thickness of paraelectric layer. Theoretical calculations also imply that the electrocaloric effect of the superlattices depends not only on the relative thickness of paraelectric layer but also on misfit strain. Furthermore, control of the relative thickness of paraelectric layer and the misfit strain can change availably both the magnitude and the temperature sensitivity of the electrocaloric effect, which suggests that ferroelectric-paraelectric superlattices may be promising candidates for use in cooling devices in a wide temperature range.
Authors:
;  [1] ;  [2] ; ; ;  [3] ;  [2] ;  [3]
  1. Sino-French Institute of Nuclear Engineering and Technology, Sun Yat-Sen University, Guangzhou 510275 (China)
  2. (China)
  3. State Key Laboratory of Optoelectronic Materials and Technologies, Sun Yat-sen University, Guangzhou 510275 (China)
Publication Date:
OSTI Identifier:
22300234
Resource Type:
Journal Article
Resource Relation:
Journal Name: AIP Advances; Journal Volume: 4; Journal Issue: 10; Other Information: (c) 2014 Author(s); Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; AUGMENTATION; FERROELECTRIC MATERIALS; GINZBURG-LANDAU THEORY; LAYERS; PHASE TRANSFORMATIONS; SENSITIVITY; STRAINS; SUPERLATTICES; TEMPERATURE RANGE; THERMODYNAMIC MODEL; THERMOELECTRIC PROPERTIES; THICKNESS; TIME DEPENDENCE; TRANSITION TEMPERATURE