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

Laurent, Christophe and Demai, Jean-Jacques and Rousset, Abel and Kannan, K. R. and Rao, Chintamani Nagesa Ramachandra Fe–Cr/Al2O3 metal-ceramic composites: Nature and size of the metal particles formed during hydrogen reduction. (1994) Journal of Materials Research, 9 (1). 229-235. ISSN 0884-2914

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Official URL: http://dx.doi.org/10.1557/JMR.1994.0229

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 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:Article
Additional Information:Thanks to Cambridge University Press editor.The definitive version is available at http://journals.cambridge.org The original PDF of the article can be found at Journal of Materials Research website : http://dx.doi.org/10.1557/JMR.1994.0229
Audience (journal):International peer-reviewed journal
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Institution:French research institutions > Centre National de la Recherche Scientifique - CNRS (FRANCE)
Other partners > Indian Institute of Science - IISC (INDIA)
Université de Toulouse > Université Toulouse III - Paul Sabatier - UT3 (FRANCE)
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Deposited On:28 Mar 2014 12:21

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