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Electrical conductivity and thermopower of (1-x) BiFeO3 - xBi(0.5)K(0.5)TiO(3) (x=0.1, 0.2) ceramics near the ferroelectric to paraelectric phase transition

Tjønneland Wefring, Espen; Einarsrud, Mari-Ann; Grande, Tor
Journal article, Peer reviewed
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preprint.pdf (3.009Mb)
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http://hdl.handle.net/11250/2381351
Utgivelsesdato
2015
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  • Institutt for materialteknologi [1570]
  • Publikasjoner fra CRIStin - NTNU [19849]
Originalversjon
Physical Chemistry, Chemical Physics - PCCP 2015, 17(14):9420-9428   10.1039/c5cp00266d
Sammendrag
Ferroelectric BiFeO3 has attractive properties such as high strain and polarization, but a wide range of applications of bulk BiFeO3 are hindered due to high leakage currents and a high coercive electric field. Here, we report on the thermal behaviour of the electrical conductivity and thermopower of BiFeO3 substituted with 10 and 20 mol% Bi0.5K0.5TiO3. A change from p-type to n-type conductivity in these semi-conducting materials was demonstrated by the change in the sign of the Seebeck coefficient and the change in the slope of the isothermal conductivity versus partial pressure of O. A minimum in the isothermal conductivity was observed at

~10−2 bar O2 partial pressure for both solid solutions. The strong dependence of the conductivity on the partial pressure of O2 was rationalized by a point defect model describing qualitatively the conductivity involving oxidation/reduction of Fe3+, the dominating oxidation state of Fe in stoichiometric BiFeO3. The ferroelectric to paraelectric phase transition of 80 and 90 mol% BiFeO3 was observed at 648 ± 15 and 723 ± 15 °C respectively by differential thermal analysis and confirmed by dielectric spectroscopy and high temperature powder X-ray diffraction.
Utgiver
Royal Society of Chemistry
Tidsskrift
Physical Chemistry, Chemical Physics - PCCP

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