dc.date.accessioned | 2018-08-26T15:41:56Z | |
dc.date.available | 2018-08-26T15:41:56Z | |
dc.date.created | 2017-10-06T10:50:19Z | |
dc.date.issued | 2017 | |
dc.identifier.citation | Vøllestad, Einar Schrade, Matthias Segalini, Julie Strandbakke, Ragnar Norby, Truls Eivind . Relating defect chemistry and electronic transport in the double perovskite Ba1-xGd0.8La0.2+xCo2O6-d (BGLC). Journal of Materials Chemistry A. 2017, 5(30), 15743-15751 | |
dc.identifier.uri | http://hdl.handle.net/10852/63775 | |
dc.description.abstract | Rare earth double perovskites comprise a class of functional oxides with interesting physiochemical properties both for low- and high-temperature applications. However, little can be found relating electrical properties with equilibrium thermodynamics of non-stoichiometry and defects. In the present work, a comprehensive and generally applicable defect chemical model is developed to form the link between the defect chemistry and electronic structure of partially substituted BGLC (Ba1−xGd0.8La0.2+xCo2O6−δ, 0 ≤ x ≤ 0.5). The equilibrium oxygen content of 4 different compositions is determined as a function of pO2 and temperature by thermogravimetric analysis, and combined with defect chemical modelling to obtain defect concentrations and thermodynamic parameters. Oxidation enthalpies determined by TG-DSC become increasingly exothermic (−50 to −120 kJ mol−1) with increased temperature and oxygen non-stoichiometry for all compositions, in excellent agreement with the thermodynamic parameters obtained from the defect chemical model. All compositions display high electrical conductivities (500 to 1000 S cm−1) with shallow pO2-dependencies and small and positive Seebeck coefficients (3 to 15 μV K−1), indicating high degree of degeneracy of the electronic charge carriers. The complex electrical properties of BGLC at elevated temperatures is rationalized by a two-band conduction model where highly mobile p-type charge carriers are transported within the valence band, whereas less mobile “n-type” charge carriers are located in narrow Co 3d band. | en_US |
dc.language | EN | |
dc.title | Relating defect chemistry and electronic transport in the double perovskite Ba1-xGd0.8La0.2+xCo2O6-d (BGLC) | en_US |
dc.type | Journal article | en_US |
dc.creator.author | Vøllestad, Einar | |
dc.creator.author | Schrade, Matthias | |
dc.creator.author | Segalini, Julie | |
dc.creator.author | Strandbakke, Ragnar | |
dc.creator.author | Norby, Truls Eivind | |
cristin.unitcode | 185,15,17,10 | |
cristin.unitname | Senter for Materialvitenskap og Nanoteknologi kjemi | |
cristin.ispublished | true | |
cristin.fulltext | preprint | |
cristin.qualitycode | 1 | |
dc.identifier.cristin | 1502783 | |
dc.identifier.bibliographiccitation | info:ofi/fmt:kev:mtx:ctx&ctx_ver=Z39.88-2004&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.jtitle=Journal of Materials Chemistry A&rft.volume=5&rft.spage=15743&rft.date=2017 | |
dc.identifier.jtitle | Journal of Materials Chemistry A | |
dc.identifier.volume | 5 | |
dc.identifier.issue | 30 | |
dc.identifier.startpage | 15743 | |
dc.identifier.endpage | 15751 | |
dc.identifier.doi | http://dx.doi.org/10.1039/c7ta02659e | |
dc.identifier.urn | URN:NBN:no-66320 | |
dc.type.document | Tidsskriftartikkel | en_US |
dc.source.issn | 2050-7488 | |
dc.identifier.fulltext | Fulltext https://www.duo.uio.no/bitstream/handle/10852/63775/1/defect%2Bchemistry%2BBGLC%2BJMCA%2Brevised%2B20170706.pdf | |
dc.type.version | SubmittedVersion | |
dc.relation.project | EC/FP7/621244 | |
dc.relation.project | NFR/236828 | |
dc.relation.project | NFR/228854 | |