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Home  >  Journal list  >  MATERIALS TRANSACTIONS  >  Vol.43  No.4 (2002)  >  pp.667-673

MATERIALS TRANSACTIONS
<<Previous article Vol.43  No.4 (2002)   pp.667 - 673 Next article>>

Synthesis of Fe-Cu Nanoparticles by Mechanochemical Processing Using a Ball Mill

Yoshikazu Todaka1), Paul Gerard McCormick2), Koichi Tsuchiya1) and Minoru Umemoto1)
1) Department of Production Systems Engineering, Toyohashi University of Technology
2) Department of Mechanical and Materials Engineering, University of Western Australia


Fe–Cu nanoparticles were synthesized by mechanochemical processing, which utilizes the reaction of FeCl3 and CuCl2 with Na during ball milling. Morphologies, structures and magnetic properties of the synthesized nanoparticles were investigated. The crystallite size and mean particle size of the washed nanoparticles after 84 h milling were approximately 9 nm and 50 nm, respectively. During ball milling, the crystallite size remained constant at approximately 14 nm, while the particle size increased. The elemental mapping images of Fe and Cu by imaging filter revealed that the synthesized nanoparticles were a solid solution of the Fe–Cu system. It was seen that numerous hexagonal plates of Fe(OH)2 exist in the washed nanoparticles. The plates had a few nm in thickness and a few hundreds nm in diameter. The coercivity of the synthesized Fe–Cu nanoparticles after 48 h milling was as high as 33.5 kA/m. This is because the particle is close to the critical size for a single magnetic domain of α-Fe.


Keyword:
iron-copper solid solution, non-equilibrium phase, nanoparticle, mechanochemical reaction, ball mill, microstructure, magnetic property

Received: November 22, 2001
Accepted: February 06, 2002 , Published online: September 06, 2005
Copyright (c) 2005 The Japan Institute of Metals

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