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Author Zhang, D. T. ♦ Yang, J. J. ♦ Yue, M. ♦ Cao, S. ♦ Liu, W. Q. ♦ Zhang, J. X. ♦ Yi, X. F. ♦ Qiang, Y.
Source United States Department of Energy Office of Scientific and Technical Information
Content type Text
Language English
Subject Keyword MATERIALS SCIENCE ♦ NANOSCIENCE AND NANOTECHNOLOGY ♦ ANISOTROPY ♦ ANNEALING ♦ COBALT ALLOYS ♦ COERCIVE FORCE ♦ CONCENTRATION RATIO ♦ CRYSTALS ♦ ELECTRON DIFFRACTION ♦ IRON ALLOYS ♦ MAGNETIC MATERIALS ♦ MAGNETIC PROPERTIES ♦ MICROSTRUCTURE ♦ NANOSTRUCTURES ♦ NICKEL ALLOYS ♦ PLASMA ♦ SINTERING ♦ THORIUM ALLOYS ♦ THULIUM ALLOYS ♦ TRANSMISSION ELECTRON MICROSCOPY ♦ X-RAY DIFFRACTION ♦ ACTINIDE ALLOYS ♦ ALLOYS ♦ COHERENT SCATTERING ♦ DIFFRACTION ♦ DIMENSIONLESS NUMBERS ♦ ELECTRON MICROSCOPY ♦ FABRICATION ♦ HEAT TREATMENTS ♦ MATERIALS ♦ MICROSCOPY ♦ PHYSICAL PROPERTIES ♦ RARE EARTH ALLOYS ♦ SCATTERING ♦ TRANSITION ELEMENT ALLOYS
Abstract Structure and magnetic properties were studied for Tm{sub 2}(Co{sub 1-x}Fe{sub x}){sub 17} bulk nanocrystalline magnet synthesized by spark plasma sintering technique. X-ray diffraction results indicate both ingot and sintered magnet of Tm{sub 2}(Co{sub 0.7}Fe{sub 0.3}){sub 17} alloy exhibit hexagonal Th{sub 2}Ni{sub 17} type structure. The microstructure of the magnet is composed of Th{sub 2}Ni{sub 17} type nanograins with an average size of 35 nm detected by transmission electron microscopy and selected area electron diffraction patterns. Magnetic measurement shows that the remanence of the magnet is higher at 573 K than at 300 K, indicating there is a positive remanence temperature coefficient in the magnet. The anisotropy field of Tm{sub 2}(Co{sub 0.7}Fe{sub 0.3}){sub 17} alloy is 3.8 T, which is much higher than the H{sub A} of 2.3 T for the pure Tm{sub 2}Co{sub 17} alloy. The coercivity of the sintered magnet increases from 0.25 to 0.354 T after optimal annealing.
ISSN 00218979
Educational Use Research
Learning Resource Type Article
Publisher Date 2010-05-15
Publisher Place United States
Journal Journal of Applied Physics
Volume Number 107
Issue Number 9


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