Details
| Original language | English |
|---|---|
| Pages (from-to) | 167-171 |
| Number of pages | 5 |
| Journal | Journal of solid state chemistry |
| Volume | 220 |
| Early online date | 28 Aug 2014 |
| Publication status | Published - Dec 2014 |
Abstract
Nominal compositions Bi2CrxAl4-xO9with 0.0≤x≤2.0 (Δx=0.2) were prepared using appropriate amounts of nitrates dissolved in glycerine and heated at 800 °C for 24 h as we previously used for the preparation of solid solution series Bi2Mx/M′4-xO9(M/M′=Fe/Al, Ga/Al and Fe/Ga). The samples were characterized using XRD, FTIR and optical microscopic techniques. Analyses of XRD data show mullite type single phase can be prepared up to x=1.2. The lattice parameters (a, b and c) increases with increasing Cr content. Further increase in x (i.e., x≥1.4) show the presence of some additional phases indicating a limiting value for Cr doping is in the range of 1.2≤x≤1.4. The effect of Cr incorporation could also be observed in the infrared absorption spectra via systematic hard mode shifts of certain lattice modes, e.g. the Bi-O related vibration changes from 96 cm-to 93 cm-with increasing x up to 1.2 and certain intensity changes together with shift in peak positions. Interestingly, the absence of any splitting and shift of the high energy IR absorption peak at 821 cm-as assigned to the characteristic tetrahedral type dimer, Al;bsubesubbsubesub, indicate that the Cr thus partially substitutes only the octahedrally coordinated Al. This is confirmed by Rietveld structure refinements, too.
Keywords
- Bismuth aluminate, Bismuth oxide, Chromium oxide, Mullite type compounds
ASJC Scopus subject areas
- Materials Science(all)
- Electronic, Optical and Magnetic Materials
- Materials Science(all)
- Ceramics and Composites
- Physics and Astronomy(all)
- Condensed Matter Physics
- Chemistry(all)
- Physical and Theoretical Chemistry
- Chemistry(all)
- Inorganic Chemistry
- Materials Science(all)
- Materials Chemistry
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In: Journal of solid state chemistry, Vol. 220, 12.2014, p. 167-171.
Research output: Contribution to journal › Article › Research › peer review
}
TY - JOUR
T1 - Chromium substitution in mullite type bismuth aluminate
T2 - Bi2CrxAl4-xO9with 0≤x≤2.0
AU - Debnath, Tapas
AU - Ullah, Ahamed
AU - Rüscher, Claus H.
AU - Hussain, Altaf
N1 - Funding Information: Deutsche Forschungsgemeinschaft (DFG) , project Ge1981/2 under PAK 279 , is highly acknowledged for supporting Tapas Debnath as a guest researcher in the Institute of Mineralogy, Hannover, Germany in 2011.
PY - 2014/12
Y1 - 2014/12
N2 - Nominal compositions Bi2CrxAl4-xO9with 0.0≤x≤2.0 (Δx=0.2) were prepared using appropriate amounts of nitrates dissolved in glycerine and heated at 800 °C for 24 h as we previously used for the preparation of solid solution series Bi2Mx/M′4-xO9(M/M′=Fe/Al, Ga/Al and Fe/Ga). The samples were characterized using XRD, FTIR and optical microscopic techniques. Analyses of XRD data show mullite type single phase can be prepared up to x=1.2. The lattice parameters (a, b and c) increases with increasing Cr content. Further increase in x (i.e., x≥1.4) show the presence of some additional phases indicating a limiting value for Cr doping is in the range of 1.2≤x≤1.4. The effect of Cr incorporation could also be observed in the infrared absorption spectra via systematic hard mode shifts of certain lattice modes, e.g. the Bi-O related vibration changes from 96 cm-to 93 cm-with increasing x up to 1.2 and certain intensity changes together with shift in peak positions. Interestingly, the absence of any splitting and shift of the high energy IR absorption peak at 821 cm-as assigned to the characteristic tetrahedral type dimer, Al;bsubesubbsubesub, indicate that the Cr thus partially substitutes only the octahedrally coordinated Al. This is confirmed by Rietveld structure refinements, too.
AB - Nominal compositions Bi2CrxAl4-xO9with 0.0≤x≤2.0 (Δx=0.2) were prepared using appropriate amounts of nitrates dissolved in glycerine and heated at 800 °C for 24 h as we previously used for the preparation of solid solution series Bi2Mx/M′4-xO9(M/M′=Fe/Al, Ga/Al and Fe/Ga). The samples were characterized using XRD, FTIR and optical microscopic techniques. Analyses of XRD data show mullite type single phase can be prepared up to x=1.2. The lattice parameters (a, b and c) increases with increasing Cr content. Further increase in x (i.e., x≥1.4) show the presence of some additional phases indicating a limiting value for Cr doping is in the range of 1.2≤x≤1.4. The effect of Cr incorporation could also be observed in the infrared absorption spectra via systematic hard mode shifts of certain lattice modes, e.g. the Bi-O related vibration changes from 96 cm-to 93 cm-with increasing x up to 1.2 and certain intensity changes together with shift in peak positions. Interestingly, the absence of any splitting and shift of the high energy IR absorption peak at 821 cm-as assigned to the characteristic tetrahedral type dimer, Al;bsubesubbsubesub, indicate that the Cr thus partially substitutes only the octahedrally coordinated Al. This is confirmed by Rietveld structure refinements, too.
KW - Bismuth aluminate
KW - Bismuth oxide
KW - Chromium oxide
KW - Mullite type compounds
UR - http://www.scopus.com/inward/record.url?scp=84908018064&partnerID=8YFLogxK
U2 - 10.1016/j.jssc.2014.08.021
DO - 10.1016/j.jssc.2014.08.021
M3 - Article
AN - SCOPUS:84908018064
VL - 220
SP - 167
EP - 171
JO - Journal of solid state chemistry
JF - Journal of solid state chemistry
SN - 0022-4596
ER -