dc.contributor.author | Tjønneland Wefring, Espen | |
dc.contributor.author | Einarsrud, Mari-Ann | |
dc.contributor.author | Grande, Tor | |
dc.date.accessioned | 2016-01-04T20:45:46Z | |
dc.date.accessioned | 2016-03-03T14:13:29Z | |
dc.date.available | 2016-01-04T20:45:46Z | |
dc.date.available | 2016-03-03T14:13:29Z | |
dc.date.issued | 2015 | |
dc.identifier.citation | Physical Chemistry, Chemical Physics - PCCP 2015, 17(14):9420-9428 | nb_NO |
dc.identifier.issn | 1463-9076 | |
dc.identifier.uri | http://hdl.handle.net/11250/2381351 | |
dc.description.abstract | 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. | nb_NO |
dc.language.iso | eng | nb_NO |
dc.publisher | Royal Society of Chemistry | nb_NO |
dc.title | 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 | nb_NO |
dc.type | Journal article | nb_NO |
dc.type | Peer reviewed | en_GB |
dc.date.updated | 2016-01-04T20:45:46Z | |
dc.source.pagenumber | 9420-9428 | nb_NO |
dc.source.volume | 17 | nb_NO |
dc.source.journal | Physical Chemistry, Chemical Physics - PCCP | nb_NO |
dc.source.issue | 14 | nb_NO |
dc.identifier.doi | 10.1039/c5cp00266d | |
dc.identifier.cristin | 1243927 | |
dc.relation.project | Norges forskningsråd: 197497 | nb_NO |
dc.description.localcode | Author preprint | nb_NO |