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CRYSTALLIZATION OF AMORPHOUS Nd3Fe81B16 ALLOYS AND ITS INFLUENCE ON MAGNETIC PROPERTIES AND M?SSBAUER SPECTRA

GU BEN-XI ZHAI HONG-RU S. METHFESSEL SHEN BAO-GEN

CRYSTALLIZATION OF AMORPHOUS Nd3Fe81B16 ALLOYS AND ITS INFLUENCE ON MAGNETIC PROPERTIES AND M?SSBAUER SPECTRA

GU BEN-XI, ZHAI HONG-RU, S. METHFESSEL, SHEN BAO-GEN
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  • Received Date:  15 January 1989
  • Published Online:  08 July 2005

CRYSTALLIZATION OF AMORPHOUS Nd3Fe81B16 ALLOYS AND ITS INFLUENCE ON MAGNETIC PROPERTIES AND M?SSBAUER SPECTRA

  • 1. (1)南京大学固体微结构实验室; (2)西德Bochum Ruhr大学第四实验物理研究所; (3)中国科学院物理研究所

Abstract: Crystallization and its influence on magnetic properties and M?ssbauer spectra in the rapidly solidified amorphous Nd3Fe81B16 alloys are reported. The addition of 3at% Nd to FeB alloys raises the crystallization temperature from 435℃ for Fe81B19 to 523℃ for Nd3Fe81B16. After the crystallization at the optimal annealing condition the magnetic properties as permanent magnet were obtained to be: Br≈12kG, bHc = 2 kOe, and (BH)max≈8 MGOe, with room temperature seturation magnetization σs = 189 emu/g, remanence ratio σr/σs = 0.7 and intrinsic coercivity iHc = 2.15kOe. Comparing with widely used anisotropic BaFe12O19 ferrite, its Br and (BH)max is much higher. Therefore this material may be developed into a new cheap pe manent magnet. The influence of small addition of Nd on the physical properties of the alloys-are discussed. Based on the data from X-ray diffraction, M?ssbauer spectrocopy, SEM and magnetic measurments, the mechanism controlling the magnetization and demagnetization processes is thought to be domain wall pinning.

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