Details
| Original language | English |
|---|---|
| Pages (from-to) | 18814-18823 |
| Number of pages | 10 |
| Journal | Journal of Materials Chemistry |
| Volume | 22 |
| Issue number | 36 |
| Publication status | Published - 16 Jul 2012 |
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 "Al 3O10" 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 (Bi0.94Sr 0.06)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.
ASJC Scopus subject areas
- Chemistry(all)
- General Chemistry
- Materials Science(all)
- Materials Chemistry
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In: Journal of Materials Chemistry, Vol. 22, No. 36, 16.07.2012, p. 18814-18823.
Research output: Contribution to journal › Article › Research › peer review
}
TY - JOUR
T1 - Strontium doping in mullite-type bismuth aluminate
T2 - A vacancy investigation using neutrons, photons and electrons
AU - Gesing, Thorsten M.
AU - Schowalter, Marco
AU - Weidenthaler, Claudia
AU - Murshed, M. Mangir
AU - Nénert, Gwilherm
AU - Mendive, Cecilia B.
AU - Curti, Mariano
AU - Rosenauer, Andreas
AU - Buhl, J. Christian
AU - Schneider, Hartmut
AU - Fischer, Reinhard X.
PY - 2012/7/16
Y1 - 2012/7/16
N2 - 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 "Al 3O10" 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 (Bi0.94Sr 0.06)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.
AB - 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 "Al 3O10" 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 (Bi0.94Sr 0.06)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.
UR - http://www.scopus.com/inward/record.url?scp=84865245115&partnerID=8YFLogxK
U2 - 10.1039/c2jm33208f
DO - 10.1039/c2jm33208f
M3 - Article
AN - SCOPUS:84865245115
VL - 22
SP - 18814
EP - 18823
JO - Journal of Materials Chemistry
JF - Journal of Materials Chemistry
SN - 0959-9428
IS - 36
ER -