Abstract
Nominally pure MgO crystals were implanted with lithium ions with different energies and fluences. The defect profile induced by the implantation was primarily characterized by Rutherford backscattering spectrometry and optical absorption measurements. Several absorption bands, associated with oxygen vacancies and higher-order defects involving oxygen, were observed. No evidence was found for the formation of Li colloids during implantation. Thermal annealings in flowing argon at increasing temperatures improved the crystalline quality of the implanted region and induced the appearance of extinction bands associated with Mie scattering from Li colloids. The influence of both intrinsic and extrinsic defects on the formation of precipitates was also investigated in lithium-doped MgO crystals after implantation with Li ions.
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