Study of Li-6 Implanted into Niobium
The technique applied here utilizes a combination of accelerator and nuclear reactor techniques. The accelerator is used for implantation and for observation of the host lattice (radiation damage), but is difficult to use for depth profile and lattice location studies when the implanted atoms are light compared to the host atoms. Therefore, in order to investigate such systems, a nuclear reactor is used for observing light implants, such as He-3, Li-6, Be-7, or B-10, by means of the (n, p) or (n, α) reactions.
The present paper deals with Li-6 implanted at 220 keV into niobium. Depth profiles are measured and compared with theoretical distributions. At low temperatures, diffusion of a small fraction of Li is observed, while the main part remains immobile up to about 900°C. By heating the Nb(Li) sample up to 990°C, the diffusion of the remaining Li-6 is measured.
Heating in air at atmospheric pressure to 700°C shows particular corrosion patterns: abundant oxidation to white Nb2O5 at damaged sites, whereas unirradiated areas turn black due to lower states of oxidation.
KeywordsDepth Profile Lattice Location Surface Barrier Detector Corrosion Pattern Silicon Surface Barrier Detector
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