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Nanocomposite R2Fe14B/α-Fe permanent magnets

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3 Author(s)
Hadjipanayis, G.C. ; Dept. of Phys. & Astron., Delaware Univ., Newark, DE, USA ; Withanawasam, L. ; Krause, R.F.

We have studied the crystallization, crystal structure, structure morphology, and magnetic properties of R6Fe87Nb 1B6 with R=Nd, Pr, Dy, Tb and Nd3.5Fe 91Nb2B3.5 melt-spun ribbons with a microstructure consisting of a mixture of exchange-coupled magnetically hard (R2Fe14B1) and soft (α-Fe) phases. The as-spun ribbons of R-rich composition crystallize in two steps; at first the Y3Fe62B14-type+α-Fe phases are formed for R=Nd, Pr, and Dy and subsequently they transform to 2:14:1 and α-Fe upon heating above 700°C. The intermediate phase in the case of Tb6Fe87Nb1B6 is of the TbCu7-type. Very high remanences up to 145 emu/g with reduced remanences, Mr/Ms, up to 0.8 were observed. The coercivity of the samples was found to vary with the R element and the content of the hard phase. The highest room temperature coercivity of 4.5 kOe was obtained in a Nd4Tb2Fe 36Nb2B6 sample. Electron microscopy reveals a grain size of 30-50 nm, which is much larger than the size (10 nm) predicted for optimum coupling

Published in:

Magnetics, IEEE Transactions on  (Volume:31 ,  Issue: 6 )

Date of Publication:

Nov 1995

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