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The 55 K specific heat anomaly in palladium hydrideA specific heat anomaly in PdH and PdD has been observed by Aston et al. (1957) close to 55 K. Its position was found to be independent of hydrogen concentration and its magnitude to be linear in hydrogen concentration. Ferguson's (1965) and Brodowsky's (1972) explanations of the anomaly are shown to be unsatisfactory. This is true also for the detailed mechanical statistical model proposed by Staford and McLellan (1974) for interstitial solid solutions of hydrogen in transition metals. It is shown that Gopal's (1966) simple Schottky model of specific heat anomaly, which considers a system of several levels with Boltzmann statistics, provides much better agreement with experiment than the more elaborate models, both in magnitude and in predicting a linear dependence on hydrogen concentration.
Document ID
19760050053
Acquisition Source
Legacy CDMS
Document Type
Reprint (Version printed in journal)
Authors
Jacobi, N.
(Jet Propulsion Lab., California Inst. of Tech. Pasadena, CA, United States)
Vaughan, R. W.
(California Institute of Technology, Jet Propulsion Laboratory, Physics Section, Pasadena Calif., United States)
Date Acquired
August 8, 2013
Publication Date
May 1, 1976
Publication Information
Publication: Scripta Metallurgica
Volume: 10
Subject Category
Inorganic And Physical Chemistry
Accession Number
76A33019
Funding Number(s)
CONTRACT_GRANT: NAS7-100
Distribution Limits
Public
Copyright
Other

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