University of Illinois Urbana-Champaign

Nuclear Magnetic Resonance in Cu and in Liquid Cu Alloys

Odle, Ronald Lee

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https://hdl.handle.net/2142/46416

Description

Title
Nuclear Magnetic Resonance in Cu and in Liquid Cu Alloys
Author(s)
Odle, Ronald Lee
Issue Date
1965
Department of Study
Physics
Discipline
Physics
Degree Granting Institution
University of Illinois at Urbana-Champaign
Degree Name
Ph.D.
Degree Level
Dissertation
Keyword(s)
  • Nuclear magnetic resonance (NMR)
  • liquid cu alloys
  • motional narrowing
Language
en
Abstract
We have investigated the motional narrowing of the pure Cu resonance line, the shift of the line center with temperature, the line shift of liquid Cu, and of some Cu alloys as a function of composition. The peak-to-peak line width of the Cu resonance was found 0 to narrow to 0.25 + 0.1 gauss at 1050 C. It appears that foe effect of volume expansion alone can explain the observed 3.5% shift of the pure solid Cu resonance line from room temperature up to the melting point. At the melting point of pure Cu the Knight shift increases abruptly by 5. 1%. This increase is too great to be explained solely by the volume increase upon melting. A possible explanation is that the Fermi surface of Cu be co mes more nearly spherical upon melting. The solution of Au, Zn, Ga, Ge, As, and Ni in Liquid Cu is found to decrease the Knight shift from its value in pure Liquid Cu. This change in the Knight shift appears to be dominated by a valence effect. For the positive valence solutes -,6K/Kc plotted against valence difference displays a peak at a valence difference between 3 and 4. It seems likely that the charge distributions in solid Ag and Cu alloys are similar and that drastic changes in the charge distributions do not occur upon melting. The experimental values of -~.K/Kc are interpreted with a free electron: scattering model. The agreement between theory and experiment is reasonably good when physically plausible scattering phase shifts are chosen and .electron-electron interactions are taken into account in an approximate way.
Type of Resource
text
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http://hdl.handle.net/2142/46416
Copyright and License Information
©1965 Ronald Lee Odle

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