| Issue |
J. Phys. Colloques
Volume 42, Number C6, Décembre 1981
International Conference on Phonon Physics
|
|
|---|---|---|
| Page(s) | C6-722 - C6-724 | |
| DOI | https://doi.org/10.1051/jphyscol:19816211 | |
International Conference on Phonon Physics
J. Phys. Colloques 42 (1981) C6-722-C6-724
DOI: 10.1051/jphyscol:19816211
1 CNPq Research Fellow
2 On leave from the Physics Department, Universidade Federal do Ceará
3 Instituto de Física, UNICAMP, 13.100, Campinas, SP, Brazil
J. Phys. Colloques 42 (1981) C6-722-C6-724
DOI: 10.1051/jphyscol:19816211
PIEZOSPECTROSCOPIC STUDY OF THE RAMAN SPECTRUM OF LiIO3
F. Cerdeira1, F.E.A. Melo2 et R.S. Katiyar31 CNPq Research Fellow
2 On leave from the Physics Department, Universidade Federal do Ceará
3 Instituto de Física, UNICAMP, 13.100, Campinas, SP, Brazil
Abstract
We studied the effect of stress on the Raman Spectrum of α-LiIO3, with the external force directed both parallel and perpendicular to the crystallographic c-axis. The low frequency part of the spectrum (ω ≤ 200cm-1), consisting of translational modes, exhibits the largest frequency changes and is selected for detailed discussion. These changes are well described by a linear deformation potential theory which allows calculation of Grüneisen parameters and other anharmonic coefficients. The former are in good agreement with those obtained independently using hydrostatic pressure. No significant difference in the value of these parameters was found when comparing results from data taken at two different temperatures (77K and 300K).