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Solubility of Hydrogen in Solid Solution Palladium Alloys
, R. Leiberich, A. Weiss
Published in
Volume: 161
Issue: Part_1_2
Pages: 83 - 105
Hydrogen absorption isotherms have been determined for the face centered cubic alloys Pd1-xMX in the pressure range 1 ≤ p/mbar ≤ 1000. M = erbium: x = 0.044 and 0.078; 473 ≤ T/K ≤ 873. M = niobium: x = 0.024 and 0.056; 473 ≤ T/K ≤ 673. M = tantalum: x = 0.022 and 0.051; 473 ≤ T/K ≤ 673. For all alloys investigated, the room temperature lattice constant is expanded by the alloying element M. Substitution of Pd by Nb and Ta, respectively, lowers the hydrogen solubility. At a given hydrogen concentration r, the equilibrium hydrogen pressure of Pd1−xNbxHr and of Pd1−xTaxH, r increases with increasing x. Erbium has the opposite effect; in Pd1−xErxHr the hydrogen solubility increases with increasing erbium content x. The partial molar enthalpies of solution at infinite dilution, [FORMULA OMITTED], decrease with increasing x (Er), but slightly increase with increasing x (Nb) and x (Ta), respectively. The partial molar excess entropies at infinite dilution, [FORMULA OMITTED], decrease with the increase of the Er, Nb and Ta-content, respectively. © by R. Oldenbourg Verlag.
About the journal
JournalZeitschrift fur Physikalische Chemie