Details
| Originalsprache | Englisch |
|---|---|
| Seiten (von - bis) | 2463-2469 |
| Seitenumfang | 7 |
| Fachzeitschrift | Journal of the European Ceramic Society |
| Jahrgang | 21 |
| Ausgabenummer | 14 |
| Frühes Online-Datum | 15 Sept. 2001 |
| Publikationsstatus | Elektronisch veröffentlicht (E-Pub) - 15 Sept. 2001 |
Abstract
Oriented and polished high quality sillimanite single crystals were thermically treated for 4, 24 and 96 h at 1600°C. The products were quenched to room temperature and investigated using polarized IR microspectroscopy in reflection mode (600-4000 cm-1). The spectra of the 24 and 96 h thermically treated sample indicates the transformation of sillimanite to 3:2 mullite plus melt of eutectic SiO2/Al2O3 composition. The anisotropy of the spectra show a high degree of orientation of crystals according to a topotaxic reaction. The high wavenumber mullite latticc bands between 1100 and 1200 cm-1 are assigned to modes of [SiO4] units interconnected within the mullite specific (Al*SiAl-Oc*] 3-clusters, and Si-Oc-Si- and Si-Oc-Al-bonds. It is shown that the sillimanite to mullite transformation occurs by an increased damping of all modes of the sillimanite lattice due to an irreversible increase of anharmonicity preserved as a typical property of mullite.
ASJC Scopus Sachgebiete
- Werkstoffwissenschaften (insg.)
- Keramische und Verbundwerkstoffe
- Werkstoffwissenschaften (insg.)
- Werkstoffchemie
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in: Journal of the European Ceramic Society, Jahrgang 21, Nr. 14, 15.09.2001, S. 2463-2469.
Publikation: Beitrag in Fachzeitschrift › Artikel › Forschung › Peer-Review
}
TY - JOUR
T1 - Thermic transformation of sillimanite single crystals to 3:2 mullite plus melt
T2 - Investigations by polarized IR-reflection micro spectroscopy
AU - Rüscher, C. H.
PY - 2001/9/15
Y1 - 2001/9/15
N2 - Oriented and polished high quality sillimanite single crystals were thermically treated for 4, 24 and 96 h at 1600°C. The products were quenched to room temperature and investigated using polarized IR microspectroscopy in reflection mode (600-4000 cm-1). The spectra of the 24 and 96 h thermically treated sample indicates the transformation of sillimanite to 3:2 mullite plus melt of eutectic SiO2/Al2O3 composition. The anisotropy of the spectra show a high degree of orientation of crystals according to a topotaxic reaction. The high wavenumber mullite latticc bands between 1100 and 1200 cm-1 are assigned to modes of [SiO4] units interconnected within the mullite specific (Al*SiAl-Oc*] 3-clusters, and Si-Oc-Si- and Si-Oc-Al-bonds. It is shown that the sillimanite to mullite transformation occurs by an increased damping of all modes of the sillimanite lattice due to an irreversible increase of anharmonicity preserved as a typical property of mullite.
AB - Oriented and polished high quality sillimanite single crystals were thermically treated for 4, 24 and 96 h at 1600°C. The products were quenched to room temperature and investigated using polarized IR microspectroscopy in reflection mode (600-4000 cm-1). The spectra of the 24 and 96 h thermically treated sample indicates the transformation of sillimanite to 3:2 mullite plus melt of eutectic SiO2/Al2O3 composition. The anisotropy of the spectra show a high degree of orientation of crystals according to a topotaxic reaction. The high wavenumber mullite latticc bands between 1100 and 1200 cm-1 are assigned to modes of [SiO4] units interconnected within the mullite specific (Al*SiAl-Oc*] 3-clusters, and Si-Oc-Si- and Si-Oc-Al-bonds. It is shown that the sillimanite to mullite transformation occurs by an increased damping of all modes of the sillimanite lattice due to an irreversible increase of anharmonicity preserved as a typical property of mullite.
KW - Mullite
KW - Sillimanite
KW - Spectroscopy
UR - http://www.scopus.com/inward/record.url?scp=0034820364&partnerID=8YFLogxK
U2 - 10.1016/S0955-2219(01)00264-3
DO - 10.1016/S0955-2219(01)00264-3
M3 - Article
AN - SCOPUS:0034820364
VL - 21
SP - 2463
EP - 2469
JO - Journal of the European Ceramic Society
JF - Journal of the European Ceramic Society
SN - 0955-2219
IS - 14
ER -