Tailoring the electrical conductivity and hardening in BiFeO3 ceramics

In this report, the influence of cobalt doping and annealing atmosphere on the electrical conductivity and polarization switching of BiFeO3 (BFO) ceramics was studied. Electrical conductivity as well as hardening behavior has been found to increase with introduction of acceptor CoFe' sites. BFO...

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Bibliographic Details
Published in:Journal of the European Ceramic Society 2020-12, Vol.40 (15), p.5483-5493
Main Authors: Makarovic, M., Kanas, N., Zorko, A., Ziberna, K., Ursic, H., Smabraten, D.R., Selbach, S.M., Rojac, T.
Format: Article
Language:English
Subjects:
Ceramics
Conductivity
Ferroelectric
Hardening
Point defects
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Summary:In this report, the influence of cobalt doping and annealing atmosphere on the electrical conductivity and polarization switching of BiFeO3 (BFO) ceramics was studied. Electrical conductivity as well as hardening behavior has been found to increase with introduction of acceptor CoFe' sites. BFO ceramics doped with Co exhibit p-type conductivity, dominated by Fe4+ defects, which can be successfully reduced during high-temperature annealing in N2. However, indications of local reduction were found, presumably on domain walls and grain boundaries. A mechanism of hardening is proposed, which assumes two types of pinning centers: i) VBi'''  and FeFe• related and ii) CoFe' and VO•• related, most probably bound into complexes, which are shown to play the key role in the hardening behavior and hysteresis loop pinching and biasing. The results of this study could further promote designing local and bulk conductivity and hardening properties of BFO-based materials.
ISSN:0955-2219
1873-619X
DOI:10.1016/j.jeurceramsoc.2020.06.037