Raman spectroscopy study of REH_3 under pressure

摘要

The Raman spectroscopic studies of two rare earth trihydrides: YH_3, HoH_3, have been performed in the pressure range from ambient up to 16 GPa and 25 GPa respectively. For the first time samples of REH_3 in the form of powder have been studied by Raman spectroscopy using the Diamond Anvil Cell (DAC) technique. A rapid decrease of Raman activity has been observed for the hydrides under pressure values in the vicinity of structural phase transition. Metallization as a possible reason for the observed dramatic change of the REH_3 Raman activity has been discussed.