Hydrogen-bearing phases phase compositions

Assuming the composition of the hydride to be expressed by PdjH2 (which corresponds to PdH0. 7) and bearing in mind the interstitial positioning of the hydrogen in the palladium lattice, the authors postulate the existence of the following equilibrium at the surface of the j8-hydride phase... 

This paper has presented a review of the proton NMR results that directly compare the properties of crystalline and amorphous metal hydrides with similar compositions. The types of information on structure, diffusion behavior, and electronic properties that can be extracted from the experimental proton NMR parameters have been described. While these studies have shown some rather remarkable differences between the crystalline and amorphous hydride phases, most of the current evaluations have been of a qualitative nature. Additional, more detailed, experiments and supporting quantitative analyses are needed to explain the specific sources of these differences. The existing NMR data should be extended to other suitable metal-hydrogen systems while as many complimentary techniques as feasible should also be brought to bear on these issues. 

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