Effect of pressure on OH and OD impurities in LiNbO3

Abstract

The fundamental vibrational transition frequencies of ON and OD defects, as well as the first OH overtone and the vibrational-librational OH-combination band, are investigated in LiNbO3 under pressure using the diamond-anvil technique. The absorption bands shift to lower wavenumbers and become considerably broader at higher pressures. The experimental results are alternatively discussed within a single oscillator model and a recently developed model for hydrogen bonds in solids.