Investigation of chemical composition and crystal structure in sintered Ce{sub 15}Nd{sub 15}Fe{sub bal}B{sub 1} magnet

Journal Article · Wed Oct 15 04:00:00 EDT 2014 · AIP Advances

DOI:https://doi.org/10.1063/1.4898646· OSTI ID:22299624

Huang, Shu-lin ^[1]; Feng, Hai-bo; Zhu, Ming-gang; Li, An-hua; Li, Wei ^[1]; Zhang, Yue ^[2]

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1. Functional Materials Research Institute, Central Iron and Steel Research Institute, Beijing 100081 (China)
2. School of Materials Science and Engineering, University of Science and Technology Beijing, Beijing 100083 (China)

The substitution of cerium, a more abundant rare-earth element, for sintered Nd-Fe-B magnets has drawn intense interest. In the present work, nominal composition of Ce{sub 15}Nd{sub 15}Fe{sub bal}B{sub 1} (wt. %), with cerium constitutes increased to 50% of the total rare-earth content, was used. And Ce-free Nd{sub 30}Fe{sub bal}B{sub 1} (wt. %) was prepared by the same preparation process as comparison. The microstructure of the sintered magnets has been investigated by means of X-ray diffraction and transmission electron microscope. The results show that there are three kinds of RE-rich phases in the same magnet, i.e., fcc-(Ce,Nd)O{sub x} (a=0.547nm), hcp-(Ce,Nd){sub 2}O{sub 3} (a=0.386nm, c=0.604nm) and bcc-(Ce,Nd){sub 2}O{sub 3} (a=1.113nm). Ors of (140)(Ce,Nd){sub 2}Fe{sub 14}B// (1-21)bcc-(Ce,Nd){sub 2}O{sub 3}(∼3°), [001](Ce,Nd){sub 2}Fe{sub 14}B// [-214]bcc-(Ce,Nd){sub 2}O{sub 3}; (01-1)(Ce,Nd){sub 2}Fe{sub 14}B// (101)fcc- (Ce,Nd)O{sub x}(∼2°), [101](Ce,Nd){sub 2}Fe14B// [12-1]fcc-(Ce,Nd)O{sub x} were found through selected area electron diffraction (SAED) analysis. According to the analysis, it can be concluded that cerium has partly substituted for neodymium by occupying the corresponding atom sites in the Ce{sub 15}Nd{sub 15}Fe{sub bal}B{sub 1} magnet, without changing the crystal configuration.

• OSTI ID: 22299624
• Journal Information: AIP Advances, Journal Name: AIP Advances Journal Issue: 10 Vol. 4; ISSN AAIDBI; ISSN 2158-3226
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
BCC LATTICES
CERIUM
CHEMICAL COMPOSITION
CRYSTALS
DEUTERIDES
ELECTRON DIFFRACTION
FCC LATTICES
HCP LATTICES
MAGNETS
MICROSTRUCTURE
NEODYMIUM
TRANSMISSION ELECTRON MICROSCOPY
X-RAY DIFFRACTION