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Nuclear magnetic resonance in metals and alloys
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Tranfield, Graham (1975) Nuclear magnetic resonance in metals and alloys. PhD thesis, University of Warwick.
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Official URL: http://webcat.warwick.ac.uk/record=b1747790~S15
Abstract
This thesis reports experimental and theoretical work on the NMR Knight shift in simple liquid metals.
Measurements have been made of the ¹¹³cd Knight shift in a series of binary alloys involving zinc, indium, tin, mercury, lead, thallium, bismuth, copper, silver and antimony. Generally there is a small variation of the Knight shift with concentration, as with other simple liquid metals.
The main theoretical work has been the development of a formalism for evaluating-the Knight shift to include nonlocal pseudopotentials. Calculations have been performed for all simple metals and many binary alloys, using this formalism. The pure metal results generally show agreement with experiment to within 20%, which is a great improvement on other calculations of this type which have used local potentials. Elements in the 5th row of the periodic table are exceptions, where it is necessary to make significant relativistic corrections to core electron wave function. There is a similar agreement between theory and experiment for alloy, however, in the majority of alloy systems studied there are very small changes of Knight shift, and this method is insufficiently sensitive to predict these small variations. In the alkali metal alloys, the Knight shift changes quite significantly with concentration, and the general pattern of these large changes is predicted.
The Knight shifts of both elements in Hg-In alloys have been measured as a function of temperature, and pseudopotential calculations have also been performed for this system. A significant improvement is found from the use of a pseudopotential which takes account of the influence of the mercury 5d core level.
| Item Type: | Thesis (PhD) | ||||
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| Subjects: | Q Science > QC Physics | ||||
| Library of Congress Subject Headings (LCSH): | Nuclear magnetic resonance, Knight shift, Liquid metals | ||||
| Official Date: | October 1975 | ||||
| Dates: |
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| Institution: | University of Warwick | ||||
| Theses Department: | Department of Physics | ||||
| Thesis Type: | PhD | ||||
| Publication Status: | Unpublished | ||||
| Supervisor(s)/Advisor: | Styles, Graham A. | ||||
| Extent: | 119, [67] leaves | ||||
| Language: | eng |
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