THE NUCLEAR MAGNETIC RESONANCE AND THE ELECTRON PARAMAGNETIC RESONANCE OF LiF DOPED WITH MnF$sub 2$
Thesis/Dissertation
·
OSTI ID:4723171
An investigation was performed of the shape of NMR (nuclear magnetic resonance) and EPR (electron paramagnetic resonance) lines in crystalline structure of cubic symmetry. Powdered lithium fluoride samples doped with paramagnetic divalent manganese ions of various concentration were chosen. The NMR lines of Li/sup 7/ and F/sup 1/ were observed at temperatures of 77, 4, and 1.5 un. Concent 85% K. The width of the lines was measured. For samples with more than one per cent added manganese, a alight increase of the line width for Li/sup 7/ was observed toward low temperatures. For a sample with a 10 per cent manganese concentration, a decrease of the line width of F/sup 19/ was found at low temperatures. For the other samples, essentially no change in the line width was detected. The EPR spectrum of Mn/sup 2+/ was investigated at room temperature. Well resolved hyperfine lines for all the samples were observed. The observed NMR line widths are in contradiction to the present theories which derived the second moments on the basis of a pure dipole-dipole interaction between the nuclear species measured and the various nuclear and electronic spins in a more or less static crystalline structure. The experimental resuits on the NMR line widths of F in the manganese-doped lithium fluoride indicated the presence of a narrowing mechanism for the fluorine. Whether a possible antiferromagnetism of the manganese moments at low temperatures together with a possible mobility of lattice vacancies can account for the observed effects is not yet understood. (Dissertation Abstr. XXIII, No. 8)
- Research Organization:
- Originating Research Org. not identified
- NSA Number:
- NSA-17-020048
- OSTI ID:
- 4723171
- Country of Publication:
- Country unknown/Code not available
- Language:
- English
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