201. Interstitial nitrogen Atomic effect on the magnetic properties of Nd2Fe14B compound.
- Author
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Zha, Liang, Lin, Zhongchong, Wang, Fanggui, Liu, Zhou, Xue, Mingzhu, Yang, Jie, Yang, Wenyun, Tian, Guang, Han, Jingzhi, Wang, Changsheng, Du, Honglin, Yang, Yingchang, and Yang, Jinbo
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MAGNETIC properties , *MAGNETIC anisotropy , *MAGNETIC structure , *UNIT cell , *CURIE temperature , *NEUTRON diffraction , *NITRIDES - Abstract
• The nitrides Nd 2 Fe 14 BN δ was synthesized through the gas-solid reaction successfully. • The magnetic structure and nitrogen site were investigated systematically. • The Curie temperature had a noticeable improvement of 19 °C by introducing N atoms. The quaternary interstitial nitrides Nd 2 Fe 14 BN δ was synthesized through the gas-solid reaction of N 2 gas and Nd 2 Fe 14 B powders. It was found that Nd 2 Fe 14 BN δ alloy maintains the tetragonal structure (space group P 4 2 / mnm) with an expansion of the unit cell. Structure analyses showed the nitrogen concentration (δ) is about 0.352(48) with the volume-expansion ratio (ΔV/V) of 0.6613% in the unit cell. Refinement of neutron diffraction data indicated that the N has a site occupation preference (8:3) for the 4e (0, 0, 0.0652) site over the 4f (0.1000, 0.1000, 0) site. The room temperature saturation magnetization and the magnetocrystalline anisotropy field of Nd 2 Fe 14 BN δ slightly decrease by about 6% and 5% as compared to the parent alloy, respectively. The Curie temperature of Nd 2 Fe 14 B compound increases from 312 °C to 331 °C after nitrogenation with such a subtle volume expansion, which provides a validation prediction that we may increase the volume-expansion ratio to improve T c further. Therefore, Nd 2 Fe 14 BN δ , with better temperature stability could be obtained. [ABSTRACT FROM AUTHOR]
- Published
- 2020
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