Optical phonon modes in rhombohedral boron monosulfide under high pressure
Résumé
Raman spectra of rhombohedral boron monosulfide (r-BS) were measured under pressures up to
34 GPa at room temperature. No pressure-induced structural phase transition was observed, while
strong pressure shift of Raman bands towards higher wavenumbers has been revealed. IR spectroscopy
as a complementary technique has been used in order to completely describe the phonon
modes of r-BS. All experimentally observed bands have been compared with theoretically calculated
ones and modes assignment has been performed. r-BS enriched by 10B isotope was synthesized,
and the effect of boron isotopic substitution on Raman spectra was observed and analyzed.