Abstract
We report measurements of both Raman and transmission spectroscopy in the same samples, under high pressure. The combination of two spectroscopies is shown to improve the reliability of the data. The phase transition is found at 940 ± 0.2 kbar. The pressure dependence of the band gap is described by a density deformation potential of 4.90 ± 0.15 eV, or a linear pressure coefficient of 10.2 ± 0.3 meV kbar −1 at ambient pressure. We find that the shifts of the LO and TO phonon energies are linear with the shift of the band gap and therefore fit to a linear dependence on density with corresponding deformation potentials of 223 ± 3 cm −1 (LO) and 290 ± 3 cm −1 (TO).
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