Catalysis Database

Critical helium concentration and its effect on bubble growth in palladium

R, Rajaraman and B, Viswanathan and K.P, Gopinathan (1994) Critical helium concentration and its effect on bubble growth in palladium. Solid State Communications, 91 (8). pp. 621-625.

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Abstract

Helium bubble growth in palladium, implanted with different helium concentrations from 25 to 250 appm, has been investigated by positron lifetime spectroscopy during isochronal annealing. It is found that the bubble growth behaviour for helium above a critical concentration of 1OOappm is different from that for doses below it. In palladium with < 100 appm helium, the bubble radius increases sharply with annealing temperature. For helium concentrations s 100 appm, the bubble radius increases slowly upto 1200K, above which the growth rate picks up. These observations are explained on the basis of the build-up of overpressure in bubbles and correlating the change in growth behaviour with pressure.

Item Type:Article
Subjects:Science > Chemistry
ID Code:359
Deposited By:INVALID USER
Deposited On:15 Mar 2007 21:02
Last Modified:15 Mar 2007 21:02

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