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No.1(pp.1-39)

Home > Issues > Volume 10 (2005) > No.1(pp.1-39)

The Presence and Role of Intergranular Phase in Nd₈Fe_86-xNb_xB₆(x = 0, 1, 2, 3) Nanocomposite Magnet Characterized by Mossbauer Spectroscopy

Journal of Magnetics, Volume 10, Number 1, 31 Mar 2005, Pages 14-22

Jong Soo Han(Department of Physics, Yeungnam University), Choong Jin Yang*

(Nanotechnology Research Lab., Research Institute of Industrial Science & Technology (RIST)), Eon Byeung Park(Nanotechnology Research Lab., Research Institute of Industrial Science & Technology (RIST)), Eng Chan Kim(Department of Physics, Yeungnam University)

Abstract

Precisely refined Mossbauer study and nano structure observation revealed that intergranular phase formed between a-Fe and Nd₂Fe₁₄B phase in NdFeNbB alloys plays a significant role on the magnetic properties. The intergranular interaction was characterized in term of Henkel Plot (δM plot), and hyperfine field, quardrupole splitting and isomer shift were refined to predict the presence and role of the intergranular phase. By the addition of Nb into Nd₈Fe₈₆B₆ composition, coercivity was found to increase by 25% due to the refinement of average grain size of both the soft and hard magnetic phases which was decreased from 50 nm of virgin Nd₈Fe₈₆B₆ to 25 nm in Nd₈Fe₈₅Nb₁B₆ alloys. The role of Nb addition was confirmed to stabilize the Nd₂Fe₁₄B lattice preventing from thermal vibration of the corresponding sites substituted Fe by Nb atoms in all sites in the Nd₂Fe₁₄B lattice. The enhanced coercivity was originated from the exchange hardening of soft and amorphous phases surrounding the hard magnetic Nd₂Fe₁₄B crystal.

Keywords: nanocomposite; Mossbauer; exchange interaction

DOI:

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