Ss. Narayanan et S. Ramaprabhu, HYDROGEN SOLUBILITY AND THERMODYNAMICS OF DISSOLVED HYDROGEN IN PD1-XTBX (X = 0.05 AND 0.08) SOLID-SOLUTION ALLOYS, Berichte der Bunsengesellschaft fur Physikalische Chemie, 101(12), 1997, pp. 1896-1900
Citations number
34
Journal title
Berichte der Bunsengesellschaft fur Physikalische Chemie
The hydrogen absorption and the thermodynamics of dissolved hydrogen i
n Pd1-xTbx (x = 0.05 and 0.08) solid solution alloys have been determi
ned from the pressure-composition temperature relation in the ranges 5
less than or equal to P/mbar less than or equal to 1000 and 473 less
than or equal to T/K less than or equal to 873 using a pressure reduct
ion method, The hydrogen solubility is found to increase with increase
of x(Tb). The partial molar enthalpy of hydrogen solution at infinite
dilution (Delta H-H(o)) and the partial molar excess entropy of disso
lved hydrogen at infinite dilution (Delta S-H(E.o)) decrease with incr
ease of terbium content. The chemical potential of dissolved hydrogen
at infinite dilution (Delta H-H(o)) decreases with increase of X-Tb in
dicating that the stability of dissolved hydrogen increases with incre
ase of X-Tb. The Pd1-xTbx-H systems fall on the correlation between th
e ionic diameter (d(RE)) of the substituent RE metals when in solution
in Pd and the exothermicity of hydrogen absorption for the Pd1-xREx-H
(RE = Er, Ho, Dy, Y, Gd and Sm; x = 0.05 and 0.075) systems.