Abstract
Thin foil specimens of A1 single crystals are implanted with 50 keV Kr ions to a fluence of 10 16 Kr/cm 2. The motion of Kr bubbles formed by the Kr implantation has been examined with a transmission electron microscope after isothermal annealing treatments and is analyzed by an image scanner attached to a personal computer. It is revealed that the bubbles can move at random at a given temperature for a given annealing time. The diffusion coefficients of the bubbles are calculated from the moving distances and are estimated to be D B = 7.5 × 10 −18, 1.8 × 10 −17, and 6.2 × 10 −17 cm 2/ s at 573, 603, and 633 K, respectively. The activation energy for the motion of bubbles is estimated to be 1.50 eV, suggesting volume diffusion of A1 atoms.
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