Studies of the low temperature anomaly in palladium hydride
Ellis, Thomas Edward
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https://hdl.handle.net/2142/25603
Description
Title
Studies of the low temperature anomaly in palladium hydride
Author(s)
Ellis, Thomas Edward
Issue Date
1978
Doctoral Committee Chair(s)
Satterthwaite, C.B.
Department of Study
Physics
Discipline
Physics
Degree Name
Ph.D.
Degree Level
Dissertation
Keyword(s)
low temperature anomally
palladium hydride
electrical resistance anomally
Language
en
Abstract
Three studies of the low temperature anomaly in Pd-H and Pd-D have been undertaken. In the first, a study of the electrical resistance anomaly has been made to determine the effects of varying hydrogen concentration. The temperature of the resistive peak was seen to increase with H(D)/Pd for ratios above .63.
In the second experiment samples of Pd-H and Pd-D with high
(T > 70 K) anomaly temperatures have been held below T for extended time
a a periods. Resistance was seen to fall by up to 60% after several days of annealing. Reductions in annealing temperature caused further reductions in resistance. The changes are reversible; heating the samples to 90 K or more restored the original resistance. The third experiment was a neutron diffraction experiment on a single crystal of PdD.76. Annealing the crystal at 70 K produced superlattice diffraction lines belonging to the star {4/5 2/5 0}. The growth of the new lines with time bears a striking relationship to the resistance behavior. The peaks were erased by heating to 90 K, and reappeared at the same locations when the crystal was again annealed at 70 K.
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