Reduction Kinetics of FeO-CoO Solid Solution by Hydrogen Gas
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RODUCTION
THE magnetic properties of Fe-Co nanoalloys are of extreme interest in a variety of applications.[1,2] The present work was aimed at the bulk production and characterization of these alloys. A novel green route toward the production of alloys and intermetallics is by hydrogen reduction of metal oxides, because it involves less unit processes and is environmentally friendly. The method has been employed in the present laboratory to synthesize a number of unique alloys over the past decade.[3] In the present work, this process is employed to produce Fe-Co alloys by the reduction of the solid solutions of the corresponding oxides. The kinetics of the reduction of the oxide solid solutions was investigated by the thermogravimetry technique. The structure, particle size distribution, and magnetic properties of the Fe-Co alloys prepared in bulk by use of the fluidized bed reactor were preliminarily analyzed by scanning electron microscope (SEM), transmission electron microscope (TEM), laser particle sizer (LPS), and vibrating sample magnetometer (VSM). II.
EXPERIMENTAL
This investigation involved synthesis of the Fe-Co alloys by two different methods of isothermal reduction: fixed bed and fluidized bed. The Fe-Co alloys produced were then characterized by a variety of analytical methods. A. Preparation of FeO-CoO Solid Solution The starting materials used in the present work are Fe (99.95 pct, Merck, Darmstadt, Germany), Fe2O3 LIDONG TENG, Professor, SATOKO NOGUCHI, Professor, and SESHADRI SEETHARAMAN, Professor, are with the Department of Materials Science and Engineering, Royal Institute of Technology, SE-10044 Stockholm, Sweden. Contact e-mail: [email protected] Manuscript submitted July 17, 2006. METALLURGICAL AND MATERIALS TRANSACTIONS B
(99.8 pct, Alfa Aezar, Karlsruhe, Germany), and Co3O4 (99.8 pct,
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