Nano Archive

Synthesis and reduction behavior of sol-precipitated iron oxide/tungsten oxide nanoparticles

Pak, Jong-Jin and Bahgat, M and Paek, Min-Kyu (2009) Synthesis and reduction behavior of sol-precipitated iron oxide/tungsten oxide nanoparticles. Journal of Alloys and Compounds, In Press, Accepted Manuscript . - . (In Press)

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Official URL: http://www.sciencedirect.com/science/article/B6TWY...

Abstract

Nanoparticles made from a Fe2O3/WO3 powder mixture were synthesized by the sol-precipitation method. Calcined Fe2O3/WO3 powder was compacted and then reduced in a hydrogen atmosphere at 800–1000 °C. Complete reduction of the nanoparticles was achieved resulting in a nanocrystalline (27 nm) homogenous Fe–W alloy. The reduction was studied by thermogravimetric analysis to determine the kinetics and reaction mechanism. The Arrhenius equation with mathematical formulations for the gas–solid reaction was applied to calculate the activation energy values and to determine the controlling reaction mechanism. The synthesized oxide mixture and the various reduction products were characterized by XRD, SEM, TEM, and VSM to determine the effect of hydrogen reduction on the microstructure, magnetic properties, and reaction kinetics of the Fe–W alloy.

Item Type:Article
Uncontrolled Keywords:Fe–W alloy; Nanoparticles; Gaseous reduction; Reduction kinetics; Magnetic properties
Subjects:Material Science > Nanofabrication processes and tools
Material Science > Nanostructured materials
ID Code:3970
Deposited By:SPI
Deposited On:08 Apr 2009 10:08
Last Modified:08 Apr 2009 10:08

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