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Title: The flexoelectric effect associated size dependent pyroelectricity in solid dielectrics

A phenomenological thermodynamic theory is used to investigate the effect of strain gradient on the pyroelectric effect in centrosymmetric dielectric solids. Direct pyroelectricity can exist as external mechanical stress is applied to non-pyroelectric dielectrics with shapes such as truncated pyramids, due to elastic strain gradient induced flexoelectric polarization. Effective pyroelectric coefficient was analyzed in truncated pyramids. It is found to be controlled by size, ambient temperature, stress, and aspect ratio and depends mainly on temperature sensitivity of flexoelectric coefficient (TSFC) and strain gradient of the truncated pyramids dielectric solids. These results show that the pyroelectric property of Ba{sub 0.67}Sr{sub 0.33}TiO{sub 3} above T{sub c} similar to PZT and other lead-based ferroelectrics can be obtained. This feature might widely broaden the selection of materials for infrared detectors with preferable properties.
Authors:
 [1] ;  [2] ;  [3] ; ; ;  [1] ;  [4]
  1. Jiangsu Provincial Engineering Laboratory for RF Integration and Micropackaging and College of Electronic Science and Engineering, Nanjing University of Posts and Telecommunications, Nanjing 210023 (China)
  2. (China)
  3. Laboratory of Solid State Microstructures, Nanjing University, Nanjing 210093 (China)
  4. College of Electronic and information Engineering, Hebei University, Baoding 071002 (China)
Publication Date:
OSTI Identifier:
22492344
Resource Type:
Journal Article
Resource Relation:
Journal Name: AIP Advances; Journal Volume: 5; Journal Issue: 9; Other Information: (c) 2015 Author(s); Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; AMBIENT TEMPERATURE; ASPECT RATIO; BARIUM COMPOUNDS; ELECTRIC CHARGES; FERROELECTRIC MATERIALS; POLARIZATION; PYROELECTRIC EFFECT; PZT; SOLIDS; STRAINS; STRESSES; STRONTIUM TITANATES; TEMPERATURE DEPENDENCE