Abstract
A formulation for the elastic energy of metal-hydrogen systems is derived by taking account of uniaxial components of strain in addition to dilatation, and a change of the self-trapped state with elongation of the c axis is examined by solving the Schrodinger equation for a hydrogen isotope on interstitial sites in a bct lattice. From these calculations, it is shown that, in VH 0.5 and VD 0.5 , the bct structure with an axial ratio c / a =1.1 is stabilized at low temperatures, with H(D) atoms occupying O z sites.
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