Abstract
Lattice dynamics of PdDx and PdHx are analysed with reference to the coherent neutron scattering experiments of Rowe et al. (1974) and incoherent neutron scattering lineshape reported by Rahman et al. (1976). Disorder in the octahedral interstitial sublattice is treated within a coherent potential approximation format suitable for treating both 'on-site' and 'off-diagonal' randomness. The authors' results lead to a substantial readjustment (upwards) in the accepted values of the D-D potential. Moreover, an adjustment (downwards) is also indicated in the published value of the Pd-H potential.
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