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Phase transitions of ruthenium-doped iron oxide studied by Fe-57 Mossbauer spectroscopy at elevated temperatures

Helgason, Orn; Ayub, Ibrar; Berry, Frank J. and Crabb, Eleanor (2002). Phase transitions of ruthenium-doped iron oxide studied by Fe-57 Mossbauer spectroscopy at elevated temperatures. Hyperfine Interactions, 141-142(1-4) pp. 291–295.

DOI (Digital Object Identifier) Link: http://dx.doi.org/10.1023/A:1021259632278
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Abstract

The Fe-57 Mossbauer spectra recorded in situ from 5% ruthenium-doped maghemite show parameters typical for maghemite up to 600 K and a hyperfine field distribution indicating that the process of doping is to some extent, inhomogeneous and the materials are formed with a range of particle size. At 700 K a phase transition of maghemite to hematite is detected and further studies show that Ru-doped hematite had a Morin transition temperature at ca. 390 K. Further heating of the sample to 800 K accelerates the maghemite-hematite and broadens the temperature range over which the Morin transition takes place.

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.
Keywords: Mössbauer spectroscopy; ruthenium-doped iron oxides; Morin transition
Academic Unit/Department: Science > Life, Health and Chemical Sciences
Interdisciplinary Research Centre: Centre for Earth, Planetary, Space and Astronomical Research (CEPSAR)
eSTEeM
Biomedical Research Network (BRN)
Item ID: 5757
Depositing User: David Shuker
Date Deposited: 09 Nov 2006
Last Modified: 07 Mar 2014 13:42
URI: http://oro.open.ac.uk/id/eprint/5757
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