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Atmosphere controlled conductivity and Maxwell-Wagner relaxation in Bi0.5K0.5TiO3 – BiFeO3 ceramics

Morozov, Maxim; Einarsrud, Mari-Ann; Grande, Tor
Journal article, Peer reviewed
Åpne
192. Morozov et al., J. Appl. Phys. 115 (2014) 044104.pdf (Låst)
BKTF_barriers.pdf (486.8Kb)
Permanent lenke
http://hdl.handle.net/11250/284879
Utgivelsesdato
2014
Metadata
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  • Institutt for materialteknologi [1610]
  • Publikasjoner fra CRIStin - NTNU [21000]
Originalversjon
Journal of Applied Physics 2014, 115   10.1063/1.4863798
Sammendrag
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.
Utgiver
American Institute of Physics (AIP)
Tidsskrift
Journal of Applied Physics

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