Abstract
The fact that noble gas ions implanted in metals with concentrations of a few percent precipitate at room temperature as solid bubbles under high pressure with a structure epitaxial with the host matrix (fcc or hcp) has been investigated recently. A brief survey of the results measured by transmission electron microscopy, glancing angle X-ray diffraction, energy-loss spectroscopy and positron annihilation is given. The main part of this paper deals with a study on83Kr+ implanted in Al using Mossbauer spectroscopy. The results are as follows: the precipitates grow from 1.5 nm after implantation to 3.7 nm after 700 K annealing. The recoilless fractions can be fitted very well to a Debye model. On annealing. the characteristic Mossbauer temperature gradually decreases from 89 K to 64 K, the value for solid Kr at 1 bar. At the same time a decrease in the isomer shift is observed. Even after annealing at 700 K our experiments do not show melting in the temperature range 0–230 K.
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