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Title: Fe-Cr/Al2O3 metal-ceramic composites: Nature and size of the metal particles formed during hydrogen reduction
Authors: Laurent, Ch
Demai, J J
Rousset, A
Kannan, K R
Rao, C N R
Keywords: Matrix Nanocomposites
Issue Date: Jan-1994
Publisher: Materials Research Society
Citation: Journal Of Materials Research 9(1), 229-235 (1994)
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.
Description: Restricted Access
Other Identifiers: 0884-2914
Appears in Collections:Research Papers (Prof. C.N.R. Rao)

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