Strontium doping in mullite-type bismuth aluminate: A vacancy investigation using neutrons, photons and electrons

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dc.identifier.uri Gesing, Thorsten M. Schowalter, Marco Weidenthaler, Claudia Murshed, M. Mangir Nénert, Gwilherm Mendive, Cecilia B. Curti, Mariano Rosenauer, Andreas Buhl, Josef-Christian Schneider, Hartmut Fischer, Reinhard X. 2017-11-01T09:44:45Z 2017-11-01T09:44:45Z 2012
dc.identifier.citation Gesing, T.M.; Schowalter, M.; Weidenthaler, C.; Murshed, M.M.; Nénert, G. et al.: Strontium doping in mullite-type bismuth aluminate: A vacancy investigation using neutrons, photons and electrons. In: Journal of Materials Chemistry 22 (2012), Nr. 36, S. 18814-18823. DOI:
dc.description.abstract We report on strontium doped dibismuth-nonaoxoaluminate(III) produced at 1023 K. Partial substitution of bismuth by strontium in the structure yields oxygen vacancies for charge balance. Introducing oxygen vacancies rearranged the associated Al2O7 double-tetrahedra forming “Al3O10” tri-clusters which were identified by multi-quantum 27Al MAS NMR. Both STEM-EDX and XPS showed homogeneous distribution of strontium in the bulk and on the surface, respectively. Moreover, XPS confirms the valence state of bismuth after doping. The orientations of bismuth 6s2 lone electron pairs were calculated using DFT methods. The amount of strontium in the crystal structure was further confirmed from the decomposition product SrAl12O19 formed during the temperature-dependent X-ray powder diffraction. The structural proof was carried out by refining the structure of (Bi0.94Sr0.06)2Al4O8.94 from powder neutron and X-ray diffraction data. Rietveld refinements clearly showed the under occupation of one oxygen site and the shift of two aluminum atoms from the double-tetrahedra to two tri-cluster sites. eng
dc.language.iso eng
dc.publisher Cambridge : Royal Society of Chemistry
dc.relation.ispartofseries Journal of Materials Chemistry 22 (2012), Nr. 36
dc.rights Es gilt deutsches Urheberrecht. Das Dokument darf zum eigenen Gebrauch kostenfrei genutzt, aber nicht im Internet bereitgestellt oder an Außenstehende weitergegeben werden. Dieser Beitrag ist aufgrund einer (DFG-geförderten) Allianz- bzw. Nationallizenz frei zugänglich.
dc.subject Aluminum eng
dc.subject Bismuth eng
dc.subject Geometry eng
dc.subject Oxygen vacancies eng
dc.subject Rietveld refinement eng
dc.subject Silicate minerals eng
dc.subject X ray diffraction eng
dc.subject X ray photoelectron spectroscopy eng
dc.subject X ray powder diffraction eng
dc.subject Aluminum atoms eng
dc.subject Charge balances eng
dc.subject Decomposition products eng
dc.subject DFT method eng
dc.subject Homogeneous distribution eng
dc.subject Lone electron pair eng
dc.subject MAS NMR eng
dc.subject Oxygen site eng
dc.subject Partial substitution eng
dc.subject STEM-EDX eng
dc.subject Temperature dependent eng
dc.subject Valence state eng
dc.subject X-ray diffraction data eng
dc.subject Strontium eng
dc.subject.ddc 540 | Chemie ger
dc.title Strontium doping in mullite-type bismuth aluminate: A vacancy investigation using neutrons, photons and electrons eng
dc.type article
dc.type Text
dc.relation.issn 0959-9428
dc.bibliographicCitation.issue 36
dc.bibliographicCitation.volume 22
dc.bibliographicCitation.firstPage 18814
dc.bibliographicCitation.lastPage 18823
dc.description.version publishedVersion
tib.accessRights frei zug�nglich

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