Influence of Dy2O3 Doping on Coercivity of Mechanically Milled Nd2Fe14B/α-Fe Composite Magnets

doi:10.11901/1005.3093.2015.343

Chinese Journal of Materials Research

2016, Vol. 30

Issue (2): 95-98 DOI: 10.11901/1005.3093.2015.343

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Influence of Dy₂O₃ Doping on Coercivity of Mechanically Milled Nd₂Fe₁₄B/α-Fe Composite Magnets

LI Yingfei, TIAN Na^**(

), FAN Xiaodong, YOU Caiyin

(School of Materials Science and Engineering, Xi’an University of Technology, Xi’an 710048, China)

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LI Yingfei, TIAN Na, FAN Xiaodong, YOU Caiyin. Influence of Dy₂O₃ Doping on Coercivity of Mechanically Milled Nd₂Fe₁₄B/α-Fe Composite Magnets. Chinese Journal of Materials Research, 2016, 30(2): 95-98.

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Abstract

Nd₂Fe₁₄B/α-Fe composite magnets were fabricated by mechanically ball milling. The influence of Dy₂O₃ doping on the coercivity of the nanocomposite magnets was studied in detail. It was found that the coercivity of the composite magnets can be significantly improved by Dy₂O₃ doping, and the annealing temperature corresponding to the maximum coercivity decreases with the increase of Dy₂O₃ content. X-ray diffraction analysis shows that the lattice parameters of Nd₂Fe₁₄B decreased due to Dy₂O₃ doping, indicating that (Nd, Dy)₂Fe₁₄B hard magnetic phase formed after Dy partial replacement for Nd. Therefore, the enhancement of coercivity of the magnets can be mainly attributed to the increase of the magnetic crystalline anisotropy of the hard magnetic phase. However, with the increase of the magnetic crystalline anisotropy, the effective exchange coupling length was shortened, thereby, the coercivity dropped due to over doping of Dy₂O₃.

Key words: metal material Nd2Fe14B/α -Fe composite magnet Dy2O3 doping coercivity exchange coupling

Received: 12 June 2015

ZTFLH:	O482
	TM271

Fund: *Supported by National Natural Science Foundation of China Nos.51301129, 51171148& 51371140, Fok Ying Tong Education Foundation No.131103, Shaanxi Natural Science Basic Research Plan No.2013JQ6008 and the Pivot Innovation Team of Shaanxi Electric Materials and Infiltration Technique No.2012KCT-25

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	Yingfei LI
	Na TIAN
	Xiaodong FAN
	Caiyin YOU

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https://www.cjmr.org/EN/10.11901/1005.3093.2015.343 OR https://www.cjmr.org/EN/Y2016/V30/I2/95

Fig.1 X-ray diffraction patterns of the composite magnets annealed at 973 K

Table 1 Lattice parameters of composite magnets annealed at 973 K

Fig.2 Coercivity of composite magnets varying with the annealing temperature (measured at room temperature)

Fig.3 Hysteresis loops of composite magnets annealed at 973 K (measured at room temperature)

Fig.4 Relationship between coercivity of composite magnets and measuring temperatures (70 K-300 K), the coercivity of composite magnets varying with the content of Dy₂O₃ at 70 K and 300 K, inset

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