Issue
J. Phys. Colloques
Volume 42, Number C6, Décembre 1981
International Conference on Phonon Physics
Page(s) C6-749 - C6-751
DOI https://doi.org/10.1051/jphyscol:19816220
International Conference on Phonon Physics

J. Phys. Colloques 42 (1981) C6-749-C6-751

DOI: 10.1051/jphyscol:19816220

LATTICE DYNAMICS OF THE CUBIC-TETRAGONAL PHASE TRANSITION IN KNb03

M.D. Fontana, G.E. Kugel et C. Carabatos

University of Metz, Ile du Saulcy, 57045 Metz, France


Abstract
The dynamical properties in the cubic and the tetragonal phases of KNbO3 are described on the basis of the same shell model. Calculations clearly show the strong influence of the intraionic oxygen polarizability on the ferro electric mode behaviour in both phases.