Existence states of deuterium irradiated into LiAlO2

Abstract The existence states of deuterium in LiAlO 2 were analyzed by in situ IR absorption spectroscopy during irradiation with 3 keV D 2 + at room temperature. Multiple IR absorption peaks that were related to O–D stretching vibrations were observed, mainly at 2650 cm −1 (O–D α ), 2600 cm −1 (O–D β ), and 2500 cm −1 (O–D γ ). The O–D α was assigned to the surface O–D. The O–D β and O–D γ were interpreted as two distinct O–D states for three candidates: O–D of substitutional D + for Li + ; O–D of substitutional D + for Al 3+ ; and O–D of interstitial D + . O–D β was the dominant O–D state for deuterium irradiated into LiAlO 2 , and had higher stability than O–D γ . Heating after ion irradiation led to the desorption of D 2 and an increase in the intensity of O–D β , which implies that some of the deuterium irradiated into LiAlO 2 exists in non-O–D states, such as D − captured by F centers.