Angular Correlation of Positron Annihilation Radiation from Single Crystals of Vanadium-Deuterium Alloys

Abstract

The electronic structure of V-D alloys was studied by the angular correlation measurements of positron annihilation photons using single crystals of VD 0.002 , VD 0.02 and VD 0.68 . Marked differences are observed in the correlation curves of pure vanadium and VD 0.68 with the [100], [110] and [111] orientations; the characteristic fine structures of vanadium arising from the hole band structures disappear in VD 0.68 . The results are interpreted as evidences that deuterium donates its electron to the conduction band of vanadium and the hole band fills gradually. The measurements on polycrystals of VD 0.51-0.67 and VH 0.51 were also made to compare with the results of the single crystals.