The thermodynamic properties of dilute solutions of hydrogen and deuterium in palladium have been studied by a calorimetric‐equilibrium method in the temperature range 555–909 K. The new enthalpy data are compared with data for lower temperatures reported in the literature, and are used to obtain analytical expressions for the relative partial enthalpies and heat capacities of hydrogen and deuterium. The derived partial heat capacities are larger than values calculated from the harmonic oscillator model and show distinct maxima in the temperature range 500–600 K. It is possible that this may reflect a localized‐mobile transition of the hydrogen atoms.
REFERENCES
1.
J. D.
Clewley
, T.
Curran
, T. B.
Flanagan
, and W. A.
Oates
, J. Chem. Soc. Faraday Trans. 1
69
, 449
(1973
).2.
R.
Burch
and N. B.
Francis
, J. Chem. Soc. Faraday Trans. 1
69
, 1978
(1973
).3.
4.
G.
Boureau
, O. J.
Kleppa
, and P.
Dantzer
, J. Chem. Phys.
64
, 5247
(1976
).5.
6.
7.
C.
Picard
, O. J.
Kleppa
, and G.
Boureau
, J. Chem. Phys.
69
, 5549
(1978
).8.
JANAF Thermochemical Tables, Supplement (Dow Chemical, Midland, Mich., 1977).
9.
W.
Drexel
, A.
Murani
, D.
Tocchetti
, W.
Kley
, I.
Sosnowska
, and D. K.
Ross
, J. Phys. Chem. Solids
37
, 1135
(1976
).10.
G.
Boureau
, O. J.
Kleppa
, and P. D.
Antoniou
, J. Solid State Chem.
28
, 223
(1979
).11.
M.
O’Keeffe
and S. A.
Steward
, Ber. Bunsenges. Phys. Chem.
76
, 1278
(1972
).12.
13.
T. L. Hill, in An Introduction to Statistical Thermodynamics (Addison‐Wesley, Reading, Mass., 1960), pp. 172–175.
14.
15.
16.
17.
W. A.
Oates
, A.
Mainwood
, and A. M.
Stoneham
, Philos. Mag. A
38
, 607
(1979
).18.
J. Völkl and G. Alefeld, in Hydrogen in Metals, edited by G. Alefeld and J. Völkl (Springer, Berlin, 1978), Vol. 1, pp. 321–348.
19.
H.
Katsuta
, R. J.
Farraro
, and R. B.
McLellan
, Acta Metall.
27
, 1111
(1979
).20.
V. A.
Gol’tsov
, V. B.
Demin
, V. B.
Vykhodets
, G. Ye.
Kagan
, and P. V.
Gel’d
, Phys. Met. Metallogr.
29
, 1305
(1970
).
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1982
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