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Synthesis and Characterization of Structure Controlled Nano-cobalt Particles

Published online by Cambridge University Press:  11 February 2011

Shiqiang Hui ,
Mingzhong Wu ,
Shihui Ge ,
Dajing Yan ,
Y.D. Zhang ,
T.D. Xiao ,
M. J. Yacaman ,
M. Miki-Yoshida ,
W. A. Hines  and
J. I. Budnick
Shiqiang Hui
Affiliation:
Inframat Corporation, Farmington, CT 06032
Mingzhong Wu
Affiliation:
Inframat Corporation, Farmington, CT 06032
Shihui Ge
Affiliation:
Inframat Corporation, Farmington, CT 06032
Dajing Yan
Affiliation:
Inframat Corporation, Farmington, CT 06032
Y.D. Zhang*
Affiliation:
Inframat Corporation, Farmington, CT 06032
T.D. Xiao
Affiliation:
Inframat Corporation, Farmington, CT 06032
M. J. Yacaman
Affiliation:
Department of Chemical Engineering, University of Texas, Austin, TX 78712
M. Miki-Yoshida
Affiliation:
Texas Materials Institute, University of Texas at Austin, Austin, TX 78712–2201
W. A. Hines
Affiliation:
Physics Department and IMS, University of Connecticut, Storrs, CT 06269
J. I. Budnick
Affiliation:
Physics Department and IMS, University of Connecticut, Storrs, CT 06269
*
Author to whom correspondence should be addressed; email: yzhang@inframat.com, Tel: 860–487–3838, Fax: 860–429–5911, Inframat Corp., Willington, CT 06279
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Abstract

Nanostructured cobalt particles with and without a ceramic coating have been synthesized using a wet chemical method. The structure and magnetic properties of synthesized powder were characterized using x-ray diffraction (“XRD”), high-resolution transmission electron microscopy (“HRTEM”), and a Quantum Design (SQUID) magnetometer. The cobalt nanoparticles are of either face-centered cubic (“fcc”) and/or hexagonally close-packed (“hcp”) crystalline structures. The average grain size is ∼14 nm for cobalt (either fcc or hcp) with an amorphous silica coating, and the average grain size is ∼9 nm for hcp cobalt and 26 nm for fcc cobalt without a silica coating. The effect of annealing temperature on grain size and magnetic properties are addressed.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 755: Symposium DD – Solid-State Chemistry of Inorganic Materials IV , 2002 , DD5.20
Copyright
Copyright © Materials Research Society 2003

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