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http://dx.doi.org/10.4191/kcers.2017.54.4.04

Nonstoichiometric Effects in the Leakage Current and Electrical Properties of Bismuth Ferrite Ceramics  

Woo, Jeong Wook (School of Advanced Materials Engineering, Changwon National University)
Baek, SeungBong (School of Advanced Materials Engineering, Changwon National University)
Song, Tae Kwon (School of Advanced Materials Engineering, Changwon National University)
Lee, Myang Hwan (School of Advanced Materials Engineering, Changwon National University)
Rahman, Jamil Ur (School of Advanced Materials Engineering, Changwon National University)
Kim, Won-Jeong (Department of Physics, Changwon National University)
Sung, Yeon Soo (Department of Materials and Engineering, Pohang University of Science and Technology)
Kim, Myong-Ho (School of Advanced Materials Engineering, Changwon National University)
Lee, Soonil (Energy and Environmental Materials Division, Korea Institute of Ceramic Engineering and Technology)
Publication Information
Journal of the Korean Ceramic Society / v.54, no.4, 2017 , pp. 323-330 More about this Journal
Abstract
To understand the defect chemistry of multiferroic $BiFeO_3-based$ systems, we synthesized nonstoichiometric $Bi_{1+x}FeO_{3{\pm}{\delta}}$ ceramics by conventional solid-state reaction method and studied their structural, dielectric and high-temperature charge transport properties. Incorporation of an excess amount of $Bi_2O_3$ lowered the Bi deficiency in $BiFeO_3$. Polarization versus electric field (P-E) hysteresis loop and dielectric properties were found to be improved by the $Bi_2O_3$ addition. To better understand the defect effects on the multiferroic properties, the high temperature equilibrium electrical conductivity was measured under various oxygen partial pressures ($pO_2{^{\prime}}s$). The charge transport behavior was also examined through thermopower measurement. It was found that the oxygen vacancies contribute to high ionic conduction, showing $pO_2$ independency, and the electronic carrier is electron (n-type) in air and Ar gas atmospheres.
Keywords
Bismuth ferrite; Ferroelectric; Electrical conductivity; Defect; Nonstoichiometry;
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Times Cited By KSCI : 4  (Citation Analysis)
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