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The dipole force components in nano-sized metal hydrides are quantitativelydetermined with curvature and x-ray diffraction measurements. Ab-initio densityfunctional theory is used to calculate the dipole components and the symmetryof the strain field. The hydrogen occupancy in a 100 nm thick V film is shownto be tetrahedral with a slight asymmetry at low concentration and a transitionto octahedral occupancy is shown to take place at around 0.07 [H/V] at 360 K.When the thickness of the V layer is reduced to 3 nm and biaxially strained, ina Fe_0.5V_0.5/V superlattice, the hydrogen unequivocally occupies octahedralz-like sites, even at and below concentrations of 0.02 [H/V].

Hydrogen site occupancy and strength of forces in nano-sized metal hydrides