Abstract
Results describing the interaction of helium with the Y2Ti2O7 structure are presented. Density functional theory has been used to determine the solution energy of a variety of interstitial sites in Y2Ti2O7, as well as to explain the effects of helium on the electronic structure. A large effect due to electron–electron repulsion is observed between the oxygen and helium electrons and an overall change in the bonding nature of atoms in the immediate vicinity is noticed when helium interstitials are present. This is a preliminary study to understanding the mechanisms causing complex oxide nanoclusters to serve as trapping sites for helium in nanostructured ferritic alloys.
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