Abstract
Isotherms have been measured for H(D)2(g) solution in crystalline Pd9Si2 in the temperature range from 235 to 373 K. The solubilities are significant, e.g., at 1.0 MPa (298 K), (H/Pd) = 0.052 or Pd9Si2H0.47, however, there is no indication of hydride phase formation even down to 235 K at 1.0 MPa. The thermodynamic values for hydrogen solutions at infinite dilution of hydrogen are ΔHoII = -11.9 kJ/mole 12H2 and ΔSoII = -50 J/K mole 12H2. The former is more negative than for Pd-H2 and the latter is somewhat more positive; but generally the values are not that different from Pd-H2. The isotope effect is similar to that found for Pd-H(D)2.
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