| Numéro |
J. Phys. Colloques
Volume 42, Numéro C6, Décembre 1981
International Conference on Phonon Physics
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|---|---|---|
| Page(s) | C6-752 - C6-754 | |
| DOI | https://doi.org/10.1051/jphyscol:19816221 | |
International Conference on Phonon Physics
J. Phys. Colloques 42 (1981) C6-752-C6-754
DOI: 10.1051/jphyscol:19816221
1 ILL Grenoble, France
2 Inst. f. Kristallographie, Univ. München, F.R.G.
3 IFF-KFA Jülich, F.R.G.
J. Phys. Colloques 42 (1981) C6-752-C6-754
DOI: 10.1051/jphyscol:19816221
ON THE Si-O-Si BOND ANGLE IN α- AND β -QUARTZ
B. Dorner1, H. Boysen2, F. Frey2 et H. Grimm31 ILL Grenoble, France
2 Inst. f. Kristallographie, Univ. München, F.R.G.
3 IFF-KFA Jülich, F.R.G.
Abstract
The structural change from α to β-quartz is accompanied by an enlargement of the Si-O-Si bond angle with increasing temperature. At the same time the SiO4 tetrahedra shrink. The speculative explanation is that with increasing temperature the electron density on the Si atom adopts some d-type components. The soft mode at Ɖ and another strongly temperature dependent mode at M reflect the structural changes.