Spectral Density Functions for Diffusion Through Disordered Materials

Title
Spectral Density Functions for Diffusion Through Disordered Materials
Publication Date
1997
Author(s)
Girard, Christian James
Sholl, Colin
Type of document
Thesis Masters Research
Language
en
Entity Type
Publication
UNE publication id
une:7247
Abstract
The purpose of this thesis is to examine the nuclear spin relaxation results for diffusion in a disordered system. This is complicated as the presence of the disorder means that the spins no longer diffuse about the system in a simple, regular manner. The way in which the disorder is manifest in the system is difficult to know exactly and the modelling can be difficult and time consuming for a large system with many spins present. For this thesis it was decided to examine the relaxation rates by modelling the diffusion exactly for a small, finite system at a low concentration of spins. The time constants T₁and T₁p can then be calculated exactly and compared to both experimental and theoretical work carried out on much larger systems. The purpose of this was to see how accurately a small system could model the real, large scale systems and to gain some insight into the mechanisms behind the diffusion process in a disordered system.
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