GAS SWELLING AND RELATED PHENOMENA IN BERYLLIUM IMPLANTED WITH DEUTERIUM IONS

An extensive TEM study of the microstructure of TIP-30 Be implanted wi th 3 and 10 keV D ions to fluences, Phi, in the range from 3 X 10(20) to 8 X 10(21) D/m(2) at temperatures, T-irr = 300, 500 and 700 K has b een carried out. Depth distributions of separate D atoms and D-2 molec ules have been investigated by means of SIMS and RGA methods, correspo ndingly. D ion irradiation, accompanied by blistering, gives rise to d estructions dependent mainly on T-irr. Irradiation at 300 K leads to t he formation of tiny D-2 bubbles of 1 nm in size (reminiscent of He bu bbles in Be). At T-irr greater than or equal to 500 K, along with smal l facetted bubbles, the development of larger oblate cavities occurs a ccumulating most of injected deuterium and providing for a much higher gas swelling compared to that at 300 K. D (He) ion implantation leads to the enhanced growth of microcrystalline layers of cph-BeO oxide wi th a microstructure differing from that on the electropolished Be surf ace. Based on the analysis of experimental data deuterium reemission, thermal desorption and trapping in defects are discussed.