Magnetic properties enhancement of nanocomposite Nd{sub 9.5}Fe{sub 81.5}B{sub 9} melt{endash}spun ribbons by La and Cr substitutions

Journal Article · Tue Apr 01 00:00:00 EST 1997 · Journal of Applied Physics

DOI:https://doi.org/10.1063/1.364973· OSTI ID:554263

Chang, W C; Wu, S H ^[1]; Ma, B M; Bounds, C O ^[2]

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1. Department of Physics, National Chung Cheng University, Ming-Hsiung, Chia-Yi, Taiwan, Republic of (China)
2. Rhone-Poulenc, Rhone-Poulenc Rare Earths and Gallium, CN 7500, Cranbury, New Jersey 08512 (United States)

The phase transformation and magnetic properties of nanocomposite (Nd{sub 0.95}La{sub 0.05}){sub 9.5}(Fe{sub 1{minus}x}Cr{sub x}){sub 81.5}B{sub 9}, where x=0, 0.033, 0.067, and 0.1, melt{endash}spun ribbons have been studied. For Cr-free ribbons (i.e, x=0,) a slight substitution of La for Nd decreases the crystallization temperature of the over-quenched ribbons. Moreover, the (Nd,La){sub 3}Fe{sub 62}B{sub 14} and (Nd,La){sub 2}Fe{sub 23}B{sub 3} phases were found to coexist with (Nd,La){sub 2}Fe{sub 14}B/Fe{sub 3}B/{alpha}-Fe phases in the crystallized (Nd{sub 0.95}La{sub 0.05}){sub 9.5}Fe{sub 81.5}B{sub 9} ribbons. The crystallization temperatures of (Nd{sub 0.95}La{sub 0.05}){sub 9.5}(Fe{sub 1{minus}x}Cr{sub x}){sub 81.5}B{sub 9} were found to increase with Cr concentration. The intrinsic coercivity of (Nd{sub 0.95}La{sub 0.05}){sub 9.5}(Fe{sub 1{minus}x}Cr{sub x}){sub 81.5}B{sub 9} increased from 6.2 kOe for x=0 to 10.7 kOe for x=0.1: Transmission electron microscopy-energy dispersion analytical x-ray analyses indicated that the increase in intrinsic coercivity may be associated with the increase in Cr concentration around grain boundaries. A sample with B{sub r}=8.3kG, {sub i}H{sub 0}=9.1kOe, and (BH){sub max}=12.5MGOe was obtained on (Nd{sub 0.95}La{sub 0.05}){sub 9.5}(Fe{sub 0.967}Cr{sub 0.033}){sub 81.5}B{sub 9} after appropriate thermal treatment. {copyright} {ital 1997 American Institute of Physics.}

• OSTI ID: 554263
• Report Number(s): CONF-961141-; ISSN 0021-8979; TRN: 98:000874
• Journal Information: Journal of Applied Physics, Vol. 81, Issue 8; Conference: 41. annual conference on magnetism and magnetic materials, Atlanta, GA (United States), 12-15 Nov 1996; Other Information: PBD: Apr 1997
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
NEODYMIUM ALLOYS
MAGNETIC PROPERTIES
IRON BASE ALLOYS
BORON ALLOYS
LANTHANUM ALLOYS
CHROMIUM ALLOYS
COMPOSITE MATERIALS
MAGNETIC TAPES
THERMAL ANALYSIS
TRANSMISSION ELECTRON MICROSCOPY
ANNEALING
LANTHANUM ADDITIONS
CHROMIUM ADDITIONS
CRYSTALLIZATION
GRAIN SIZE
COERCIVE FORCE