A Study of The a-β Phase Transformation in A1PO4:Fe^3+ and Quartz by Electron Paramagnetic Resonance

Lang, Robert

Please use this identifier to cite or link to this item: http://hdl.handle.net/11375/18730

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DC Field	Value	Language
dc.contributor.advisor	Calvo, C.	-
dc.contributor.advisor	Datars, W. R.	-
dc.contributor.author	Lang, Robert	-
dc.date.accessioned	2016-01-12T20:38:39Z	-
dc.date.available	2016-01-12T20:38:39Z	-
dc.date.issued	1971-10	-
dc.identifier.uri	http://hdl.handle.net/11375/18730	-
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.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
dc.contributor.department	Physics	en_US
dc.description.degreetype	Thesis	en_US
dc.description.degree	Doctor of Philosophy (PhD)	en_US
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