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.
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 |
| Item ID: |
5757 |
| Depositing User: |
David Shuker
|
| Date Deposited: |
09 Nov 2006 |
| Last Modified: |
02 Dec 2010 19:54 |
| URI: |
http://oro.open.ac.uk/id/eprint/5757 |
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