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Fe-Cr/Al2O3 metal-ceramic composites: Nature and size of the metal particles formed during hydrogen reduction

Laurent, C 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). 229-235 .

Full text not available from this repository.
Official URL: http://adsabs.harvard.edu/abs/1994JMatR...9..229L

Abstract

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 Mossbauer 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
Additional Information: Copyright of this article belongs to Cambridge university press.
Department/Centre: Division of Chemical Sciences > Solid State & Structural Chemistry Unit
Date Deposited: 13 Apr 2011 05:52
Last Modified: 13 Apr 2011 05:52
URI: http://eprints.iisc.ernet.in/id/eprint/36469

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