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Title: The effect of refractory metals on the magnetic properties of {alpha}-Fe/R{sub 2}Fe{sub 14}B-type nanocomposites

Abstract

The phase transformations and magnetic properties of rare earth lean and boron rich (Nd{sub 0.95}La{sub 0.05}x)Fe{sub bal.}M{sub 2}B{sub 10.5}, where x = 9.5 or 11 and M = Cr, Ti, Nb, V, Mo, Zr, Hf, Ta, Mn or W, melt spun ribbons have been investigated. Two magnetic phases, namely {alpha}-Fe and R{sub 2}Fe{sub 14}B, were found in ribbons studied. A third magnetic phase, the R{sub 2}Fe{sub 23}B{sub 3}, was also detected in (Nd{sub 0.95}La{sub 0.05}){sub 9.5}Fe{sub 78}M{sub 2}B{sub 10.5} (M = Mo and Mn). Remanence (B{sub r}) and coercivity ({sub i}H{sub c}) values in the range of 8.0 to 9.1 kG and 9.5 to 18.9 kOe, respectively, have been achieved in nanocomposites with merely two magnetic phases. Among compositions studied, the Ti and W-substitutions were found to be most effective in increasing the B{sub r} and {sub i}H{sub c}, respectively. For a fixed refractory metal substitution, namely M = Cr, Ti or Nb, an increase in the total rare earth concentration resulted in nanocomposites of small grain sizes and a high volume fraction of the R{sub 2}Fe{sub 14}B phase. The combination of fine grain size and high volume fraction of R{sub 2}Fe{sub 14}B phase led to an increase in themore » {sub i}H{sub c} and maximum energy product, (BH){sub max}, of nanocomposites studied. A B{sub r} of 9.1 kG, {sub i}H{sub c} of 16.7 kOe and (BH){sub max} of 16.8 MGOe have been obtained on (Nd{sub 0.95}La{sub 0.05}){sub 11}Fe{sub 76.5}Ti{sub 2}B{sub 10.5}.« less

Authors:
; ; ; ;
Publication Date:
Research Org.:
Chung Cheng Univ., Ming-Hsiung, Chia-Yi (TW)
OSTI Identifier:
20000750
Resource Type:
Journal Article
Journal Name:
IEEE Transactions on Magnetics (Institute of Electrical and Electronics Engineers)
Additional Journal Information:
Journal Volume: 35; Journal Issue: 5Pt2; Conference: 1999 international magnetics conference (Intermag '99), Kyongju (KR), 05/18/1999--05/21/1999; Other Information: PBD: Sep 1999; Journal ID: ISSN 0018-9464
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; PHASE TRANSFORMATIONS; MAGNETIC PROPERTIES; LAYERS; COMPOSITE MATERIALS; IRON-ALPHA; IRON BASE ALLOYS; BORON ALLOYS; REFRACTORY METALS; METALLURGICAL EFFECTS

Citation Formats

Chang, W.C., Wang, S.H., Chang, S.J., Tsai, M.Y., and Ma, B.M. The effect of refractory metals on the magnetic properties of {alpha}-Fe/R{sub 2}Fe{sub 14}B-type nanocomposites. United States: N. p., 1999. Web. doi:10.1109/20.800493.
Chang, W.C., Wang, S.H., Chang, S.J., Tsai, M.Y., & Ma, B.M. The effect of refractory metals on the magnetic properties of {alpha}-Fe/R{sub 2}Fe{sub 14}B-type nanocomposites. United States. doi:10.1109/20.800493.
Chang, W.C., Wang, S.H., Chang, S.J., Tsai, M.Y., and Ma, B.M. Wed . "The effect of refractory metals on the magnetic properties of {alpha}-Fe/R{sub 2}Fe{sub 14}B-type nanocomposites". United States. doi:10.1109/20.800493.
@article{osti_20000750,
title = {The effect of refractory metals on the magnetic properties of {alpha}-Fe/R{sub 2}Fe{sub 14}B-type nanocomposites},
author = {Chang, W.C. and Wang, S.H. and Chang, S.J. and Tsai, M.Y. and Ma, B.M.},
abstractNote = {The phase transformations and magnetic properties of rare earth lean and boron rich (Nd{sub 0.95}La{sub 0.05}x)Fe{sub bal.}M{sub 2}B{sub 10.5}, where x = 9.5 or 11 and M = Cr, Ti, Nb, V, Mo, Zr, Hf, Ta, Mn or W, melt spun ribbons have been investigated. Two magnetic phases, namely {alpha}-Fe and R{sub 2}Fe{sub 14}B, were found in ribbons studied. A third magnetic phase, the R{sub 2}Fe{sub 23}B{sub 3}, was also detected in (Nd{sub 0.95}La{sub 0.05}){sub 9.5}Fe{sub 78}M{sub 2}B{sub 10.5} (M = Mo and Mn). Remanence (B{sub r}) and coercivity ({sub i}H{sub c}) values in the range of 8.0 to 9.1 kG and 9.5 to 18.9 kOe, respectively, have been achieved in nanocomposites with merely two magnetic phases. Among compositions studied, the Ti and W-substitutions were found to be most effective in increasing the B{sub r} and {sub i}H{sub c}, respectively. For a fixed refractory metal substitution, namely M = Cr, Ti or Nb, an increase in the total rare earth concentration resulted in nanocomposites of small grain sizes and a high volume fraction of the R{sub 2}Fe{sub 14}B phase. The combination of fine grain size and high volume fraction of R{sub 2}Fe{sub 14}B phase led to an increase in the {sub i}H{sub c} and maximum energy product, (BH){sub max}, of nanocomposites studied. A B{sub r} of 9.1 kG, {sub i}H{sub c} of 16.7 kOe and (BH){sub max} of 16.8 MGOe have been obtained on (Nd{sub 0.95}La{sub 0.05}){sub 11}Fe{sub 76.5}Ti{sub 2}B{sub 10.5}.},
doi = {10.1109/20.800493},
journal = {IEEE Transactions on Magnetics (Institute of Electrical and Electronics Engineers)},
issn = {0018-9464},
number = 5Pt2,
volume = 35,
place = {United States},
year = {1999},
month = {9}
}