| Numéro |
J. Phys. Colloques
Volume 42, Numéro C6, Décembre 1981
International Conference on Phonon Physics
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|---|---|---|
| Page(s) | C6-788 - C6-790 | |
| DOI | https://doi.org/10.1051/jphyscol:19816233 | |
International Conference on Phonon Physics
J. Phys. Colloques 42 (1981) C6-788-C6-790
DOI: 10.1051/jphyscol:19816233
The Research Institute for Iron, Steel and Other Metals, Tohoku University, Sendai 980, Japan
J. Phys. Colloques 42 (1981) C6-788-C6-790
DOI: 10.1051/jphyscol:19816233
SPECTROSCOPIC IONICITY AND LATTICE INSTABILITY IN III-VI LAYER COMPOUNDS
N. Kuroda, S. Hashimoto et Y. NishinaThe Research Institute for Iron, Steel and Other Metals, Tohoku University, Sendai 980, Japan
Abstract
III-VI compounds with the sandwich-type layer structure should have Phillips' electronegativity difference in the range from 0.55 to 0.95. In a certain range of ionicity of valence bonds, however, shear mode phonons are bound to be unstable by the long range Coulomb force, so that InS crystallizes in a nonlayer structure. Three other examples of such nonlayer compounds have been found from experimental phase analysis of (GaSe)x (InSe)1-x.