Abstract
Abstract High resolution (0.05 cm−1) FTIR spectroscopy in the temperature range 9-320 K is applied to study the OH and OD stretching modes in BSO, BGO, BTO and mixed BSO-BGO sillenite crystals. A model is proposed for the OH-defect responsible for the main line. The anharmonic effects are analyzed in the framework of the Morse model and compared to those reported for OH-defects in insulating materials. The temperature dependence of the line position and width fits to a weak phonon coupling model and gives the frequency of the coupled phonons.
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