Phase Evolution and Magnetic Studies of La and Refractory Metals Co-substituted α-Fe/R_2Fe_(14)B-type Nanocomposites

查看全文 作　　者：W. C. Changt, S.H. Wang, S.J. Chang and M. Y. Tsai (Department of Physics, Chung Cheng University, Ming-Hsiung, Chia-Yi, 621, Taiwan-China Q.Chen) (Rhodia Inc., Rare Earths and Gallium, CN 7500, Cranbury, New Jersey 08512, U.S.A.) 出　　处：《Journal of Materials Science & Technology》索引2000年第16卷第2期,共5页 基　　金：National Science Council, Taiwan! under grant !No. NSC-87-2112-M194-005. 摘　　要：Phase evolution and magnetic properties of (Ndo.95La0.05)9.5-11Febal.M2B10.5. where M=Cr, Ti, Nb, V, Mo, Zr, Hf, Ta, Mn or W, melt spun ribbons have been investigated. Almost all the alloy ribbons. except for(Nd0.95La0.05)9.5Fe78M2B10.5(M=Mo and Mn),consist merely two magnetic phases, namely α-Fe and R2Fe14B, which display a better combination of iHc and magnetic energy product. Remanence (Br) and coercivity (iHc) values in the range of 8.0 to 9.1 kG and 9.5 to 18.9 kOe. respectively, can be achieved. Among compositions studied, the Ti and W-substitutions were found to be most effective in increasing the Br and iHc, 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 R2Fe14B phase, leading to an increase in the magnetic properties. 关 键 词：Fe/R2Fe B-type Nanocomposites Phase Evolution and Magnetic Studies of La and Refractory Metals Co-substituted TYPE LA