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Home  >  Journal list  >  MATERIALS TRANSACTIONS  >  Vol.43  No.4 (2002)  >  pp.660-666

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Effects of Metastable Phase Formation on the Magnetic Properties of Pr4.5Fe77B18.5 Amorphous Ribbons

Yun-Chul Jung1), Yasuya Ohmori1), Kiyomichi Nakai1), Satoshi Hirosawa2) and Hirokazu Kanekiyo2)
1) Department of Materials Science and Engineering, Faculty of Engineering, Ehime University
2) Research and Development Division, Sumitomo Special Metals Co. Ltd.

The effects of isothermal annealing on the magnetic properties of Pr4.5Fe77B18.5 amorphous ribbons have been investigated. Two separate reactions increasing coercive force (Hc) were recognized during the progress of annealing. In the first reaction, hard magnetic Pr2Fe14B particles with nanoscale diameters precipitated in the vicinity of Fe3B and Pr2Fe23B3 particles. The precipitation of fine Pr2Fe14B particles increased Hc largely but reduced saturation magnetization (Ms) significantly. In the second reaction, the Pr2Fe23B3 particles decomposed into Pr2Fe14B particles containing very fine α-Fe particles within them. This resulted in the second increase in Hc due to both the volume fraction increase of Pr2Fe14B particles and the exchange-coupling interaction between the Pr2Fe14B grains and α-Fe particles within them. This phenomenon was observed originally in the present study. In the final stages of annealing, both Hc and Ms were decreased substantially by the decomposition of Pr2Fe14B into PrFe4B4 particle in addition to the coarsening of α-Fe particles.

praseodymium-iron-boron amorphous ribbon, isothermal annealing, crystallization, phase decomposition, metastable phase, magnetic property

Received: October 29, 2001
Accepted: February 06, 2002 , Published online: September 06, 2005
Copyright (c) 2005 The Japan Institute of Metals



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