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

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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: https://doi.org/10.1039/c2jm33208f

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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.
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Document Type: article
Publishing status: publishedVersion
Issue Date: 2012
Appears in Collections:Naturwissenschaftliche Fakultät

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1 image of flag of Germany Germany 71 78.02%
2 image of flag of India India 7 7.69%
3 image of flag of United States United States 3 3.30%
4 image of flag of China China 2 2.20%
5 image of flag of Korea, Republic of Korea, Republic of 1 1.10%
6 image of flag of Japan Japan 1 1.10%
7 image of flag of Iraq Iraq 1 1.10%
8 image of flag of France France 1 1.10%
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10 image of flag of Bangladesh Bangladesh 1 1.10%
    other countries 2 2.20%

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