Paramagnetic Defects in Augelite

Vassilikoudova, AB; Eftaxias, K

dc.contributor.author	Vassilikoudova, AB	en
dc.contributor.author	Eftaxias, K	en
dc.date.accessioned	2014-03-01T01:10:05Z
dc.date.available	2014-03-01T01:10:05Z
dc.date.issued	1994	en
dc.identifier.issn	1064-1858	en
dc.identifier.uri	https://dspace.lib.ntua.gr/xmlui/handle/123456789/11307
dc.subject.classification	Physics, Atomic, Molecular & Chemical	en
dc.subject.other	RES	en
dc.subject.other	FE-3+	en
dc.title	Paramagnetic Defects in Augelite	en
heal.type	journalArticle	en
heal.identifier.primary	10.1006/jmra.1994.1219	en
heal.identifier.secondary	http://dx.doi.org/10.1006/jmra.1994.1219	en
heal.language	English	en
heal.publicationDate	1994	en
heal.abstract	The electron paramagnetic resonance spectra of augelite single crystals, Al-2(PO4)(OH)(3) have been studied at room temperature in the X-band frequency range. The monoclinic structure of augelite has two distinct Al3+ sites in the unit cell, Al(1) and Al(2) in sixfold and fivefold coordination, respectively. Paramagnetic signals from Fe3+, Cr3+, and V4+ have been detected, and the spectra have been described by the spin Hamiltonian H = beta HgS + D[(S-z(2) - S(S + 1)/3 + E(S-x(2) - S-y(2))]. The spin resonance reveals that the Fe ions occupy both Al(1) and Al(2) sites, with preference for the larger sixfold coordinated site, while the Cr ions are only located at the octahedrally coordinated positions. A mosaic angle of the crystal has been estimated from the anisotropic broadening of the +1/2 --> -1/2 transition of Fe3+. (C) 1994 Academic Press, Inc.	en
heal.publisher	ACADEMIC PRESS INC JNL-COMP SUBSCRIPTIONS	en
heal.journalName	Journal of Magnetic Resonance, Series A	en
dc.identifier.doi	10.1006/jmra.1994.1219	en
dc.identifier.isi	ISI:A1994PT40200002	en
dc.identifier.volume	111	en
dc.identifier.issue	1	en
dc.identifier.spage	11	en
dc.identifier.epage	16	en