EXAFS SPECTROSCOPY ON OVERPRESSURIZED KRYPTON BUBBLES IN COPPER AND NICKEL

Bulk copper and nickel samples containing 2.5 and 5 at.% krypton prese nt in overpressurized bubbles have been studied by EXAFS spectroscopy. A fit to the experimental data yields krypton nearest-neighbour dista nces of 3.62(4) and 3.69(4) Angstrom in a copper and a nickel matrix r espectively. These values confirm that krypton bubbles are overpressur ized. Calculated krypton packing densities are in good agreement with results from other techniques. In addition, average krypton-metal near est-neighbour distances of 3.0(1) Angstrom were determined. Atomistic calculations show a wide variation of krypton-metal distances, in agre ement with the experiment.