The pressure dependence of the Raman spectra of was investigated up to 15.5 GPa. The anti-ferrodistortive SrTiO 3 cubic-tetragonal phase transition (phonon condensation at the R point of the Brillouin zone) occurs at about 6 GPa. The strong, broad bands, present under ambient conditions, sharpen and
Raman study of antimony triiodide at high pressures
β Scribed by A. Anderson; S. K. Sharma; S. Y. Wang; Z. Wang
- Publisher
- John Wiley and Sons
- Year
- 1998
- Tongue
- English
- Weight
- 206 KB
- Volume
- 29
- Category
- Article
- ISSN
- 0377-0486
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β¦ Synopsis
Raman spectra of the layered compound, antimony triiodide are reported for samples at ambient temperature and at pressures up to 16 GPa. Changes in the number of observed peaks and their wavenumbers, relative intensities and spectral linewidths are discussed. Evidence for reversible crystallographic phase transitions at 0.3, 0.8 and 4.9 GPa is presented. Samples subjected to pressures greater than 8.3 GPa undergo an irreversible transition to a new phase which is stable up to 16 GPa. On release to ambient conditions from pressures between 8.3 and 16 GPa, SbI 3 adopts a structure which is stable but di β erent to that originally observed.
π SIMILAR VOLUMES
Pressure-induced phase transitions in Γve alkali metal-lanthanide double tungstates, were investi-ALn(WO 4 ) 2 , gated using high-pressure Raman spectroscopy in the range 0-35 GPa. A phase transition in the scheelite-type double tungstates and to a distorted monoclinic type occurs near 10 NaSm(WO )
A high-pressure Raman study of BaCeO 3 was performed at room temperature. This perovskite compound undergoes two phase transitions at about 22 and 28 GPa. The increase in the number of bands is an indication that the symmetry is lowered and that the compound does not evolve towards the ideal cubic p