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Title: Microstructure and magnetic properties of isotropic bulk Nd{sub x}Fe{sub 94-x}B{sub 6} (x=6,8,10) nanocomposite magnets prepared by spark plasma sintering

Abstract

Nd{sub 2}Fe{sub 14}B/{alpha}-Fe isotropic bulk nanocomposite magnets were prepared by spark plasma sintering (SPS) technique using melt-spun powders with a nominated composition of Nd{sub x}Fe{sub 94-x}B{sub 6}, with x=6, 8, and 10. It was found that higher sintering temperature improved the densification of the magnets, while it deteriorated their magnetic properties simultaneously due to the excess crystal grain growth. An increased compressive pressure led to better magnetic properties and higher density for the SPS magnets. An increase in the Nd amount resulted in a gradual increase in intrinsic coercivity and an obvious reduction of the remanence of the magnets simultaneously. A magnet with the composition of Nd{sub 8}Fe{sub 86}B{sub 6} possessed a B{sub r} of 0.99 T, a H{sub ci} of 386 kA/m, and a (BH){sub max} of 101 kJ/m{sup 3} under the optimal sintering condition. In addition, microstructure observation using transmission electron microscopy showed that compared with the starting powders the full-density magnets nearly maintain the morphology, indicating that there was no sign of pronounced crystal grain growth during the densification process.

Authors:
; ; ;  [1];  [2]
  1. Key Laboratory of Advanced Functional Materials, Ministry of Education, Beijing University of Technology, Beijing 100022 (China)
  2. (Canada) and Department of Physics, McGill University, 3600 University Street, Montreal, Quebec H3A 2T8 (Canada)
Publication Date:
OSTI Identifier:
20788103
Resource Type:
Journal Article
Journal Name:
Journal of Applied Physics
Additional Journal Information:
Journal Volume: 99; Journal Issue: 8; Other Information: DOI: 10.1063/1.2159391; (c) 2006 American Institute of Physics; Country of input: International Atomic Energy Agency (IAEA); Journal ID: ISSN 0021-8979
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; BORON ALLOYS; COERCIVE FORCE; COMPOSITE MATERIALS; CRYSTAL STRUCTURE; CRYSTALS; GRAIN GROWTH; IRON ALLOYS; IRON-ALPHA; MAGNETIC PROPERTIES; MICROSTRUCTURE; MORPHOLOGY; NANOSTRUCTURES; NEODYMIUM ALLOYS; PERMANENT MAGNETS; PLASMA; POWDERS; SINTERING; TRANSMISSION ELECTRON MICROSCOPY

Citation Formats

Yue Ming, Zhang Jiuxing, Tian Meng, Liu, X. B., and Center for the Physics of Materials, McGill University, 3600 University Street, Montreal, Quebec H3A 2T8. Microstructure and magnetic properties of isotropic bulk Nd{sub x}Fe{sub 94-x}B{sub 6} (x=6,8,10) nanocomposite magnets prepared by spark plasma sintering. United States: N. p., 2006. Web. doi:10.1063/1.2159391.
Yue Ming, Zhang Jiuxing, Tian Meng, Liu, X. B., & Center for the Physics of Materials, McGill University, 3600 University Street, Montreal, Quebec H3A 2T8. Microstructure and magnetic properties of isotropic bulk Nd{sub x}Fe{sub 94-x}B{sub 6} (x=6,8,10) nanocomposite magnets prepared by spark plasma sintering. United States. doi:10.1063/1.2159391.
Yue Ming, Zhang Jiuxing, Tian Meng, Liu, X. B., and Center for the Physics of Materials, McGill University, 3600 University Street, Montreal, Quebec H3A 2T8. Sat . "Microstructure and magnetic properties of isotropic bulk Nd{sub x}Fe{sub 94-x}B{sub 6} (x=6,8,10) nanocomposite magnets prepared by spark plasma sintering". United States. doi:10.1063/1.2159391.
@article{osti_20788103,
title = {Microstructure and magnetic properties of isotropic bulk Nd{sub x}Fe{sub 94-x}B{sub 6} (x=6,8,10) nanocomposite magnets prepared by spark plasma sintering},
author = {Yue Ming and Zhang Jiuxing and Tian Meng and Liu, X. B. and Center for the Physics of Materials, McGill University, 3600 University Street, Montreal, Quebec H3A 2T8},
abstractNote = {Nd{sub 2}Fe{sub 14}B/{alpha}-Fe isotropic bulk nanocomposite magnets were prepared by spark plasma sintering (SPS) technique using melt-spun powders with a nominated composition of Nd{sub x}Fe{sub 94-x}B{sub 6}, with x=6, 8, and 10. It was found that higher sintering temperature improved the densification of the magnets, while it deteriorated their magnetic properties simultaneously due to the excess crystal grain growth. An increased compressive pressure led to better magnetic properties and higher density for the SPS magnets. An increase in the Nd amount resulted in a gradual increase in intrinsic coercivity and an obvious reduction of the remanence of the magnets simultaneously. A magnet with the composition of Nd{sub 8}Fe{sub 86}B{sub 6} possessed a B{sub r} of 0.99 T, a H{sub ci} of 386 kA/m, and a (BH){sub max} of 101 kJ/m{sup 3} under the optimal sintering condition. In addition, microstructure observation using transmission electron microscopy showed that compared with the starting powders the full-density magnets nearly maintain the morphology, indicating that there was no sign of pronounced crystal grain growth during the densification process.},
doi = {10.1063/1.2159391},
journal = {Journal of Applied Physics},
issn = {0021-8979},
number = 8,
volume = 99,
place = {United States},
year = {2006},
month = {4}
}