Structure and magnetic properties of N-containing Nd–Fe–B alloys prepared by mechanical alloying

Authors

W. Liu, International Center for Materials Physics, Institute of Metal Research, Academia Sinica, Shenyang 110015, People's Republic of China
Z.D. Zhang, International Center for Materials Physics, Institute of Metal Research, Academia Sinica, Shenyang 110015, People's Republic of China
J. Ping Liu, University of Nebraska-LincolnFollow
X.K. Sun, International Center for Materials Physics, Institute of Metal Research, Academia Sinica, Shenyang 110015, People's Republic of China
David J. Sellmyer, University of Nebraska-LincolnFollow

Date of this Version

5-1-2000

Comments

Published by American Institute of Physics. J. Appl. Phys. 87, 5332 (2000). ©2000 American Institute of Physics. Permission to use. http://jap.aip.org/jap/.

Abstract

The structure and magnetic properties of Nd₂Fe₁₄BN_δ -based alloys prepared by mechanical alloying have been investigated. For the Nd₁₄Fe₇₈B₈N_y series, a large amount of NdN, α-Fe, and a small Nd₂Fe₁₄B phase are observed in x-ray diffraction patterns. With increasing Nd content, the amount of the Nd₂Fe₁₄BN_δ phase increases and α-Fe decreases gradually. When x≥25 in the Nd_xFe_92-xB₈N_y systems, some amount of the N-containing, Nd-rich phase appears. Meanwhile, the content of the nitrogen in the Nd₂Fe₁₄BN_δ phase decreases and, correspondingly, the Curie temperature decreases. The coercivity and the maximum magnetic energy product of this series attain maxima at x = 25. A coercivity as high as 20 kOe has been achieved. The effect of nitrogen on the formation, composition, and magnetic properties of the Nd₂Fe₁₄BN_δ compound is discussed.