Effects of Pressure-Induced Phase Transition in Model Hg2Br2 Ferroelastics
- 3 Downloads
Raman spectra of model improper ferroelastics (Hg2Br2 crystals) have been analyzed in a wide range of hydrostatic pressures. The baric dependences of the phonon frequencies are obtained. The revealing and anomalous behavior of the soft mode, which is genetically related to the acoustic phonon (ТА1) at the Brillouin zone boundary (point X) of the tetragonal phase, are most interesting. The buildup of the second acoustic phonon (ТА2) from the same point has also been found in the ferroelastic-phase spectra, and its baric behavior has been investigated. The splitting of doubly degenerate phonons of the Eg symmetry has been revealed at fairly high pressures and explained.
Unable to display preview. Download preview PDF.
- 1.H. Mark and J. Steinbach, Z. Kristallogr. 64, 79 (1926).Google Scholar
- 2.Proceedings of the 2nd International Symposium on Univalent Mercury Halides, Trutnov, ČSFR, 1989.Google Scholar
- 4.A. A. Kaplyanskii, Yu. F. Markov, and Ch. Barta, Izv. Akad. Nauk SSSR, Fiz. 43, 1641 (1979).Google Scholar
- 6.Ch. Barta, A. A. Kaplyanskii, Yu. F. Markov, and V. Yu. Mirovitskii, Sov. Phys. Solid State 27, 1497 (1985).Google Scholar