Synthesis of Fe-ZrO2 nanocomposite powders by reduction in H2 of a nanocrystalline (Zr, Fe)O2 solid solution

The formation of Fe-ZrO2 nanocomposite powders by reduction in hydrogen of a nanocrystalline totally stabilized Zr0.9Fe0.1O1.95 solid solution was investigated by X-ray diffraction (XRD), field-emission-gun scanning electron microscopy (FEG-SEM) and Mossbauer spectroscopy. The reduction of the stabi...

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Veröffentlicht in:Journal of alloys and compounds 2009-03, Vol.471 (1-2), p.204-210
Hauptverfasser: DE RESENDE, V. G, GARCIA, F. L, PEIGNEY, A, DE GRAVE, E, LAURENT, Ch
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container_end_page 210
container_issue 1-2
container_start_page 204
container_title Journal of alloys and compounds
container_volume 471
creator DE RESENDE, V. G
GARCIA, F. L
PEIGNEY, A
DE GRAVE, E
LAURENT, Ch
description The formation of Fe-ZrO2 nanocomposite powders by reduction in hydrogen of a nanocrystalline totally stabilized Zr0.9Fe0.1O1.95 solid solution was investigated by X-ray diffraction (XRD), field-emission-gun scanning electron microscopy (FEG-SEM) and Mossbauer spectroscopy. The reduction of the stabilized Zr0.9Fe0.1O1.95 solid solution and the formation of metallic particles precedes the transformation of zirconia into the monoclinic phase, which becomes the major zirconia phase upon reduction at 950 deg C. alpha-Fe particles with a size distribution slightly increasing from 10-50 to 20-70 nm upon the increase in reduction temperature are observed and a second population of smaller ( < 5 nm) gamma-Fe nanoparticles is also noticed when the reduction is performed at 1000 deg C. Another metallic phase with a hyperfine field of 200 kOe at RT (250 kOe at 80 K) is detected, which could account for an Fe/Zr phase. It could be formed by the reduction on an Fe2+-rich transient phase incorporating a small fraction of the Zr4+ ions, formed by a phase partitioning process superimposed to the reduciton processes.
doi_str_mv 10.1016/j.jallcom.2008.03.045
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subjects Chemical Sciences
Cross-disciplinary physics: materials science
rheology
Exact sciences and technology
Material chemistry
Materials science
Materials synthesis
materials processing
Physics
title Synthesis of Fe-ZrO2 nanocomposite powders by reduction in H2 of a nanocrystalline (Zr, Fe)O2 solid solution
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