A Study of The a-β Phase Transformation in A1PO4:Fe^3+ and Quartz by Electron Paramagnetic Resonance
| dc.contributor.advisor | Calvo, C. | |
| dc.contributor.advisor | Datars, W. R. | |
| dc.contributor.author | Lang, Robert | |
| dc.contributor.department | Physics | en_US |
| dc.date.accessioned | 2016-01-12T20:38:39Z | |
| dc.date.available | 2016-01-12T20:38:39Z | |
| dc.date.issued | 1971-10 | |
| dc.description.abstract | <p> The a-β phase transformation was studied in hydrothermally grown crystals of A1PO4 by measuring the spin-Hamiltonian parameters of Fe^3+ as a function of temperature. </p> <p> The theory of the Blume-Orbach mechanism for the zero-field splitting of s-state ions was generalized and used to calculate the D-tensor of the spin-Hamiltonian. The experimentally observed temperature variation of the spin-Hamiltonian was interpreted in terms of a temperature-dependent point-multipole model of the charge distribution in the crystal lattice. </p> <p> A similar study of the a-S phase transformation in quartz was attempted but E.P.R. measurements could only be taken up to 450°C (123°C below the transformation temperature) because of the instability of the Fe^3+ center at higher temperatures. </p> | en_US |
| dc.description.degree | Doctor of Philosophy (PhD) | en_US |
| dc.description.degreetype | Thesis | en_US |
| dc.identifier.uri | http://hdl.handle.net/11375/18730 | |
| dc.language.iso | en | en_US |
| dc.subject | phase transformation | en_US |
| dc.subject | electron | en_US |
| dc.subject | paramagnetic resonance | en_US |
| dc.subject | hydrothermal crystals | en_US |
| dc.title | A Study of The a-β Phase Transformation in A1PO4:Fe^3+ and Quartz by Electron Paramagnetic Resonance | en_US |