The energy of helium filled platelets and bubbles in molybdenum

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Abstract
Theoretical models are developed to describe the observed behaviour of helium platelets in molybdenum, which grow and then collapse into clusters of bubbles. Firstly a fully dynamic simulation of helium in a two-dimensional structure is performed. Then simplified models of platelets and bubbles filled with helium are discussed, the calculated energies of which indicate that platelets should be higher in energy for 3 He/vacancy. A cluster of several bubbles is shown, under conditions of high internal pressure, to be of lower energy than a single large bubble due to the elastic interaction between bubbles on the assumption that this is approximately the same in magnitude as for the void lattice.