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Thermodynamic data for hydrogen absorption in Pd 1-y Ag y and Pd 1-y Cu y alloys, including pressure-composition isotherms and enthalpies and excess entropies of solution, are described by a multi-site lattice gas model. The distributions of site energies of hydrogen in these alloys are obtained by fitting to the data. It is found that the site energy at a Pd 6-i M i octahedral site (M identical to Ag, Cu; i=0, . . ., 6) is not a linear function of the index i. It is suggested that this non-linear behaviour originates from a local electronic effect related to the filling of the Pd d band by Ag or Cu electrons.
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Salomons et al. (1990) studied this question.
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