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Thermodynamic Properties of Dilute Solutions of Hydrogen in Glassy PD.80SI.20

Published online by Cambridge University Press:  15 February 2011

R.S. Finocchiaro ,
C.L. Tsai  and
B.C. Giessen
R.S. Finocchiaro
Affiliation:
Department of Chemistry and Materials Science Division, Institute of Chemical Analysis, Northeastern University, Boston, Massachusetts 02115, U.S.A.
C.L. Tsai
Affiliation:
Department of Chemistry and Materials Science Division, Institute of Chemical Analysis, Northeastern University, Boston, Massachusetts 02115, U.S.A.
B.C. Giessen
Affiliation:
Department of Chemistry and Materials Science Division, Institute of Chemical Analysis, Northeastern University, Boston, Massachusetts 02115, U.S.A.
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Abstract

Equilibrium vapor pressures of dilute solutions of hydrogen in glassy Pd.80Si.20 have been measured from 10–90°C and at hydrogen pressures P of 1–100 torr. Under these conditions the ratio of hydrogen to alloy, x as determined by a volumetric method, reaches a maximum value of 0.0070. Over this range of x, the system exhibits a positive deviation from Sieverts' Law; isotherms were analyzed in terms of Lacher's modified statistical mechanical theory of hydrogen in palladium. The data were used to calculate relative partial molar enthalpies, excess entropies, and excess free energies for the formation of the solid solutions. The thermodynamic properties were found to vary with hydrogen content over the composition range studied.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 8 , 1981 , 243
Copyright
Copyright © Materials Research Society 1982

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Footnotes

*

Communication No. 115 from the Institute of Chemical Analysis.

References

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