Laurent, Ch and Demai, JJ and Rousset, A and Kannan, KR and Rao, CNR (1994) Fe–Cr/Al2O3 metal-ceramic composites: Nature and size of the metal particles formed during hydrogen reduction. In: Journal of Materials Research, 9 (1). pp. 229-235.
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Fe-Cr/Al2O3 metal-ceramic composites prepared by hydrogen reduction at different temperatures and for different periods have been investigated by a combined use of Mössbauer spectroscopy, x-ray diffraction, transmission electron microscopy, and energy-dispersive x-ray spectroscopy in order to obtain information on the nature of the metallic species formed. Total reduction of Fe3+ does not occur by increasing the reduction time at 1320 K from 1 to 30 h, and the amount of superparamagnetic metallic species is essentially constant (about 10%). Temperatures higher than 1470 K are needed to achieve nearly total reduction of substitutional Fe3+. Interestingly, iron favors the reduction of chromium. The composition of the Fe-Cr particles is strongly dependent on their size, the Cr content being higher in particles smaller than 10 nm.
| Item Type: | Journal Article |
|---|---|
| Publication: | Journal of Materials Research |
| Publisher: | Cambridge University Press |
| Additional Information: | Copyright of this article belongs to Cambridge University Press. |
| Department/Centre: | Division of Chemical Sciences > Solid State & Structural Chemistry Unit |
| Date Deposited: | 25 Aug 2011 09:27 |
| Last Modified: | 25 Aug 2011 09:27 |
| URI: | http://eprints.iisc.ac.in/id/eprint/40313 |
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