The low temperature magnetic susceptibility of palladium hydride and palladium deuteride
Miller, Robert James
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https://hdl.handle.net/2142/25654
Description
Title
The low temperature magnetic susceptibility of palladium hydride and palladium deuteride
Author(s)
Miller, Robert James
Issue Date
1976
Doctoral Committee Chair(s)
Satterthwaite, C.B.
Brun, T.O.
Department of Study
Physics
Discipline
Physics
Degree Name
Ph.D.
Degree Level
Dissertation
Keyword(s)
magnetic susceptibility
palladium hydride
palladium deuteride
Faraday method
Language
en
Abstract
The magnetic susceptibility of palladium hydride for H/Pd< 0.81
and of palladium 4euteride for D/Pd < 0.65 has been measured by the
Faraday method at temperatures between 6 and 150 K. The method of
measurement has been compared in particular with that employed by
Jamieson and Manchester. High sensitivity for small samples was
achieved by utilizing the magnetic field of a superconductive solenoid.
The samples were produced by hydriding from the gas phase.
The high susceptibility of palladium was quenched upon alloying
it with hydrogen or deuterium. The local maxitllum in the susceptibility
of palladium near 75 K also disappeared.
The measurements were interpreted with respect to the two-phase
nature of these systems. No isotope effect has been detected in the
atomic ratio corresponding to the S-phase boundary (S-min) at these low
temperatures. The values of S-min were found to decrease slightly with
increasing temperature from 0.638 ± .010 at 5.8 K to 0.624 ± .004 at
149 K.
An effect corresponding to the resistive and specific heat anomalies
near 55 K was sought, but no evidence of a magnetic susceptibility anomaly
was found.
Superconductive transition temperatures were also investigated as
a function of atomic ratio for electrolytically loaded hydrides and
deuterides with atomic ratios greater than 0.8, and a reverse isotope
effect was observed. The impact of the susceptibility results on a
model which attributed the superconductive reverse isotope effect to
an electronic structure difference between Pd-H and Pd-b was discussed.
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