Details
| Original language | English |
|---|---|
| Pages (from-to) | 783-788 |
| Number of pages | 6 |
| Journal | Journal of solid state chemistry |
| Volume | 181 |
| Issue number | 4 |
| Early online date | 26 Jan 2008 |
| Publication status | Published - Apr 2008 |
Abstract
Series of compounds in the system NaxNbyW1-yO3 were prepared according to the appropriate molar ratio of Na2WO4, WO3, WO2 and Nb2O5 with x=0.80 and 0.0≤y≤0.4 at 600 °C in evacuated silica glass tubes. These compounds were investigated by X-ray powder diffraction, optical microscopy, microprobe analysis, Raman and optical microspectroscopy. A y-dependent separation into three distinct coloured crystallites with cubic perovskite-type structures is observed: (i) red-orange crystallites with composition NaxWO3 with slightly decreasing x (i.e. 0.8-0.72) with increasing nominal y, (ii) bluish solid solution of composition NaxNbyW1-yO3 and (iii) white crystallites of a new phase having defect perovskite-type structure with composition Na0.5NbO2.75.
Keywords
- Perovskite, Tungsten bronze
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. 181, No. 4, 04.2008, p. 783-788.
Research output: Contribution to journal › Article › Research › peer review
}
TY - JOUR
T1 - Solid-state synthesis in the system Na0.8NbyW1-yO3 with 0≤y≤0.4
T2 - A new phase, Na0.5NbO2.75, with perovskite-type structure
AU - Debnath, Tapas
AU - Rüscher, Claus H.
AU - Gesing, Thorsten M.
AU - Koepke, Jürgen
AU - Hussain, Altaf
N1 - Funding Information: The authors would like to thank Mr. Otto Diedrich for polishing the samples. Tapas Debnath is grateful to “Land Niedersachsen” for the funding “Lichtenberg Stipendium”. This work has been partially financed by the Alexander von Humboldt Stiftung under collaborative research programme (V-FOKOOP/DEU/1062067/Hussain).
PY - 2008/4
Y1 - 2008/4
N2 - Series of compounds in the system NaxNbyW1-yO3 were prepared according to the appropriate molar ratio of Na2WO4, WO3, WO2 and Nb2O5 with x=0.80 and 0.0≤y≤0.4 at 600 °C in evacuated silica glass tubes. These compounds were investigated by X-ray powder diffraction, optical microscopy, microprobe analysis, Raman and optical microspectroscopy. A y-dependent separation into three distinct coloured crystallites with cubic perovskite-type structures is observed: (i) red-orange crystallites with composition NaxWO3 with slightly decreasing x (i.e. 0.8-0.72) with increasing nominal y, (ii) bluish solid solution of composition NaxNbyW1-yO3 and (iii) white crystallites of a new phase having defect perovskite-type structure with composition Na0.5NbO2.75.
AB - Series of compounds in the system NaxNbyW1-yO3 were prepared according to the appropriate molar ratio of Na2WO4, WO3, WO2 and Nb2O5 with x=0.80 and 0.0≤y≤0.4 at 600 °C in evacuated silica glass tubes. These compounds were investigated by X-ray powder diffraction, optical microscopy, microprobe analysis, Raman and optical microspectroscopy. A y-dependent separation into three distinct coloured crystallites with cubic perovskite-type structures is observed: (i) red-orange crystallites with composition NaxWO3 with slightly decreasing x (i.e. 0.8-0.72) with increasing nominal y, (ii) bluish solid solution of composition NaxNbyW1-yO3 and (iii) white crystallites of a new phase having defect perovskite-type structure with composition Na0.5NbO2.75.
KW - Perovskite
KW - Tungsten bronze
UR - http://www.scopus.com/inward/record.url?scp=41249104044&partnerID=8YFLogxK
U2 - 10.1016/j.jssc.2008.01.027
DO - 10.1016/j.jssc.2008.01.027
M3 - Article
AN - SCOPUS:41249104044
VL - 181
SP - 783
EP - 788
JO - Journal of solid state chemistry
JF - Journal of solid state chemistry
SN - 0022-4596
IS - 4
ER -