| Numéro |
J. Phys. Colloques
Volume 42, Numéro C6, Décembre 1981
International Conference on Phonon Physics
|
|
|---|---|---|
| Page(s) | C6-590 - C6-592 | |
| DOI | https://doi.org/10.1051/jphyscol:19816172 | |
International Conference on Phonon Physics
J. Phys. Colloques 42 (1981) C6-590-C6-592
DOI: 10.1051/jphyscol:19816172
Institute of Organic and Physical Chemistry, Technical University,50-370 WrocŽaw, Poland
J. Phys. Colloques 42 (1981) C6-590-C6-592
DOI: 10.1051/jphyscol:19816172
TRANSLATIONAL - ROTATIONAL COUPLING IN s-TRIAZINE CRYSTAL
T. LutyInstitute of Organic and Physical Chemistry, Technical University,50-370 WrocŽaw, Poland
Abstract
An anomalous dispersion of transverse acoustic phonons, related to the ferroelastic phase transition in s-triazine crystal, have been analyzed. The dispersion relation has been found from the harmonic dynamical matrix which includes translational-rotational coupling. For the nearest neighbours interactions, the relation contains two competive terms followed from direct and indirect translational-translational coupling. When the indirect interactions are assumed to be temperature dependent, the relation reproduces the observed dispersion curves almost exactly.