Kasahun, Alemayehu (2006) Comparison of Escape Rates for a Vacancy Diffusion through One Jump and Six Jump Cycles in Well Ordered Binary Alloys. Masters thesis, Addis Ababa University.
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PDF (Comparison of Escape Rates for a Vacancy Diffusion through One Jump and Six Jump Cycles in Well Ordered Binary Alloys)
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Abstract
We use a Supersymmetry Quantum Mechanics method to calculate the escape rate of vacancy difiusion in well ordered binary alloy for low concentration structural defect in two dimension. The dynamics was mediated by long range and short range one atom and vacancy exchange. We examine the ratio of escape rate for the six-jump cycle to that for the one-jump cycle. When the efiective barrier height of the sixjump cycle is greater than or equal that of the one-jump cycle, the escape rate for the one-jump cycle is larger than that of the six-jump cycle. If the efiective barrier height of the six-jump cycle is less than that of the one-jump cycle, for relatively high temperature the escape rate for the one-jump cycle is higher than that of the six-jump cycle but at relatively low temperature the reverse is observed. We have also seen that at a ceratin temperature or barrier height, both the six-jump and the one-jump cycles have equal escape rates.
| Item Type: | Thesis (Masters) |
|---|---|
| Subjects: | Q Science > Q Science (General) Q Science > QC Physics |
| Divisions: | Africana |
| Depositing User: | Selom Ghislain |
| Date Deposited: | 26 Jun 2018 11:52 |
| Last Modified: | 26 Jun 2018 11:52 |
| URI: | http://thesisbank.jhia.ac.ke/id/eprint/4615 |
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