Abstract
The YPd 3H(D) x system was studied by means of neutron powder diffraction as well as incoherent inelastic neutron scattering at various temperatures for x=0, 0.19 and 0.30. The L1 2 structure of the YPd 3 was conserved on hydrogenation. The position and site occupation of H(D) atoms were determined from the neutron diffraction data. The H(D) atoms occupy preferentially the characteristic octahedral interstices composed by 6 Pd atoms. This result is discussed in view of the recently proposed criteria predicting the relative hydrogen occupancy of various interstitial sites in intermetallic hydride.
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