Iron-57 Mossbauer spectroscopic studies of the high temperature properties of metal-doped iron oxides

Ayub, I.; Berry, F. and Helgason, O. (2002). Iron-57 Mossbauer spectroscopic studies of the high temperature properties of metal-doped iron oxides. Hyperfine Interactions, 139-140(3-4), pp. 579–587.

DOI (Digital Object Identifier) Link:	http://dx.doi.org/doi:10.1023/A:1021274812398
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Abstract

Fe-57 Mossbauer spectra recorded in situ in vacuo from chromium- and gallium-doped Fe3O4 at elevated temperatures show the dopant ions to depress the Curie temperature of Fe3O4 by ca. 70 K. Spectra recorded from aluminium-doped. gamma-Fe2O3 show the onset of conversion to aluminium-doped alpha-Fe2O3 to begin at ca. 750 K, which is ca. 100 K above the conversion temperature for undoped. gamma-Fe2O3. The variation in magnetic hyperfine fields at temperatures exceeding ca. 750 K is similar to that recorded from alpha-Fe2O3 when doped with zinc or magnesium. At temperatures exceeding 900 K the zinc doped alpha-Fe2O3 partially converts to spinel-related ZnFe2O4.

Item Type:	Journal Article
ISSN:	0304-3843
Extra Information:	Some of the symbols may not have transferred correctly into this bibliographic record and/or abstract.
Academic Unit/Department:	Science > Life, Health and Chemical Sciences
Item ID:	5756
Depositing User:	David Shuker
Date Deposited:	09 Nov 2006
Last Modified:	02 Dec 2010 19:54
URI:	http://oro.open.ac.uk/id/eprint/5756

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