Funct. Mater. 2013; 20 (2): 203-207.

http://dx.doi.org/10.15407/fm20.02.203

Hard-magnetic melt-spun R–Fe–B alloys on the base of light rare-earth metals (R=La, Nd)

O.M.Bovda[1], V.O.Bovda[1], L.V.Onischenko[1], O.S.Tortika[1], O.O.Kostin[1], A.G.Ravlik[2], B.A.Avramenko[2], A.S.Aseev[2], V.M.Baumer[3]

[1]National Scientific Centre "Kharkiv Institute of Physics and Technology", 1 Akademicheskay Str., 61108 Kharkiv, Ukraine
[2]NTU "KhPI", 21 Frunze Str., 61002 Kharkiv, Ukraine
[3]SSI ISC, 60 Lenin Ave., 61178 Kharkiv, Ukraine

Abstract: 

Effects of La addition on microstructure and magnetic properties of LaxNd33–xFe65.9B1.1 (wt. %) melt-spun ribbons and isotropic bonded magnets were systematically studied. X-ray diffraction and DSC data revealed that addition of La led to the formation of highly refined and inhomogeneous La-rich phase. It was shown that the average grain size and volume fraction of the main magnetic (La,Nd)2Fe14B phase depend on La concentration. For better LaxNd33–xFe65.9B1.1 x = 2.5 and 5 wt. % bonded samples, the room-temperature magnetic properties of Hci = 1343 kA/m and 1300 kA/m, and Br = 0.61 T and 0.614 T were obtained. Magnetic flux aging loss for alloys with appropriate La content (x = 5–10 wt. %) did not exceed 5 % in the range of 100–125°C, which is typical for conventional ternary Nd–Fe–B melt-spun magnets.

References: 

1. Yasuhiro Une, Masato Sagawa, J. Jap. Inst. Metals, 76, 12 (2012). http://dx.doi.org/10.2320/jinstmet.76.12

2. R.S.Sheridan, R.Sillitoe, M.Zakotnik et al., J. Mag. Mag. Mat., 324, 63 (2012). http://dx.doi.org/10.1016/j.jmmm.2011.07.043

3. J.F.Herbst, M.S.Meyer, F.E.Pinkerton, J. Appl. Phys., 111, 07A718 (2012).

4. W.Tang, Y.Q.Wu, K.W.Dennis et al., J. Appl. Phys., 109, 07A704 (2011).

5. S.Sinnema, R.J.Radwanski, J.J.M.Franse et al., J. Magn. Magn. Mater., 44, 333 (1984). http://dx.doi.org/10.1016/0304-8853(84)90261-0

6. W.C.Chang, S.H.Wu, B.M.Ma, C.O.Bounds, J. Appl. Phys., 81, 4453 (1997). http://dx.doi.org/10.1063/1.364973

7. W.C.Chang, S.H.Wu, B.M.Ma, C.O.Bounds, J. Magn. Magn. Mater., 167, 65 (1997). http://dx.doi.org/10.1016/S0304-8853(96)00632-4

8. K.Y.Ko, S.Yoon, S.W.Ko, J.Phys.: Conf. Ser., 266, 012036 (2011). http://dx.doi.org/10.1088/1742-6596/266/1/012036

9. K.Y.Ko, S.Yoon, J.G.Booth et al., J. Mat. Sci., 37, 1421 (2002). http://dx.doi.org/10.1023/A:1014593217529

10. J.Rodriguez-Carvajal, T.Roisnel, FullProf.98 and WinPLOTR: New Windows 95/NT Applications for Diffraction. Commission for Powder Diffraction, International Union of Crystallography, Newsletter, No.20 (May-August) Summer (1998).

11. P.Campbell, D.N.Brown, Z.M.Chen et al., in: Proc. of HPMA04 Workshop., 1 (2004), p.31.

12. W.C.Chang, D.Y.Chiou, S.H.Wu et al., J. Appl. Phys., 83, 6271 (1998). http://dx.doi.org/10.1063/1.367572

13. D.N.Brown, Y.K.Lim, R.A.Remoroza, D.J.Miller, J. Appl. Phys., 109, 07A742 (2011).

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