| Numéro |
J. Phys. Colloques
Volume 42, Numéro C6, Décembre 1981
International Conference on Phonon Physics
|
|
|---|---|---|
| Page(s) | C6-911 - C6-913 | |
| DOI | https://doi.org/10.1051/jphyscol:19816271 | |
International Conference on Phonon Physics
J. Phys. Colloques 42 (1981) C6-911-C6-913
DOI: 10.1051/jphyscol:19816271
D.A.M.T.P., University of Liverpool, Liverpool L69 3BX, U.K.
J. Phys. Colloques 42 (1981) C6-911-C6-913
DOI: 10.1051/jphyscol:19816271
THE DIELECTRIC FUNCTION MATRIX AND THE LATTICE DYNAMICS OF KC1
M.A. Ball et W.N. LeungD.A.M.T.P., University of Liverpool, Liverpool L69 3BX, U.K.
Abstract
The RPA dielectric function matrix of KCl is calculated with a model in which the valence band consists of p-states on the Cl atoms and the conduction bands are either (i) a single OPW band or (ii) two OPW bands. Local field effects are approximately included. Results for the diagonal, some off-diagonal elements and the effective charges are presented. The long-range parts of the dynamical matrix are got from the calculations ; the short-range parts are obtained by fitting to the transverse frequencies.