The 55 K specific heat anomaly in palladium hydride
N Jacobi, RW Vaughan - Scripta Metallurgica, 1976 - ntrs.nasa.gov
N Jacobi, RW Vaughan
Scripta Metallurgica, 1976•ntrs.nasa.govA 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 …
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 …
A 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.
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