Here, we report on a giant dielectric relaxation in (1 − x)Bi0.5K0.5TiO3—xBiFeO3 ceramics below ∼300 °C, which becomes more pronounced with increasing BiFeO3 content. The relaxation was shown to be of Maxwell-Wagner type and associated with charge depletion at the electroded interfaces. It was also shown that the relaxation could be controlled or, eventually, removed by heat treatment in controlled partial pressure of oxygen. This was rationalized by the relationship between the electrical conductivity and variation in the oxidation state of Fe, which is strongly coupled to the partial pressure of oxygen. The results are discussed with emphasis on oxygen diffusion and point defect equilibria involving oxygen vacancies and iron in divalent and tetravalent state. Finally, the barrier-free dielectric properties of the (1 − x)Bi0.5K0.5TiO3—xBiFeO3 ceramics are reported.
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28 January 2014
Research Article|
January 29 2014
Atmosphere controlled conductivity and Maxwell-Wagner relaxation in Bi0.5K0.5TiO3—BiFeO3 ceramics Available to Purchase
Maxim I. Morozov;
Maxim I. Morozov
a)
Department of Materials Science and Engineering, Norwegian University of Science and Technology
, NO-7491 Trondheim, Norway
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Mari-Ann Einarsrud;
Mari-Ann Einarsrud
Department of Materials Science and Engineering, Norwegian University of Science and Technology
, NO-7491 Trondheim, Norway
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Tor Grande
Tor Grande
Department of Materials Science and Engineering, Norwegian University of Science and Technology
, NO-7491 Trondheim, Norway
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Maxim I. Morozov
a)
Mari-Ann Einarsrud
Tor Grande
Department of Materials Science and Engineering, Norwegian University of Science and Technology
, NO-7491 Trondheim, Norway
a)
Electronic mail: [email protected]
J. Appl. Phys. 115, 044104 (2014)
Article history
Received:
December 17 2013
Accepted:
January 19 2014
Citation
Maxim I. Morozov, Mari-Ann Einarsrud, Tor Grande; Atmosphere controlled conductivity and Maxwell-Wagner relaxation in Bi0.5K0.5TiO3—BiFeO3 ceramics. J. Appl. Phys. 28 January 2014; 115 (4): 044104. https://doi.org/10.1063/1.4863798
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