Optical phonon modes in rhombohedral boron monosulfide under high pressure

摘要

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 spectros-copy 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 ~(10)B isotope was synthesized, and the effect of boron isotopic substitution on Raman spectra was observed and analyzed.