Journal
CERAMICS INTERNATIONAL
Volume 45, Issue 1, Pages 1308-1313Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.ceramint.2018.10.017
Keywords
Bismuth ferrite; Pyroelectricity; AC impedance; Oxygen vacancy; Dielectric relaxation
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Funding
- National Natural Science Foundation of China [51772054]
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The pyroelectric properties of bismuth ferrite (BiFeO3) ceramics has been investigated over temperatures between 25 degrees C and 180 degrees C. AC impedance spectra have been measured over a wide frequency range from 2 mHz to 100 kHz. The results have been analyzed with respect to permittivity, conductivity, impedance and electric modulus. Based on an equivalent circuit model the bulk resistance R-bulk has been obtained from extrapolation of their Cole-Cole plots. It has been found that R-bulk decreases rapidly with increasing temperature. Origins of the observed results were discussed.
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