FT-IR study on interaction of irradiated deuteron with defects in Li2O

The existing state of hydrogen isotopes in lithium oxide was studied using the Fourier transform infrared absorption spectroscopy. Infrared spectra in Li2O single crystals irradiated by 1 MeV deuteron were recorded. Multiple peaks were observed in the O–D stretching vibration region under or after the irradiation. These peaks were attributed to the stretching vibrations of O–D present as Li2O–D+ in bulk Li2O with defects. When the irradiated sample was annealed, a large peak attributed to the LiOD phase was observed. The present study shows that most of the implanted deuteron exists without O–D bonding in the bulk Li2O crystal.