Origins of the significant improvement in nanocrystalline Samarium-Cobalt's magnetic properties when doping with Niobium
作者： Tzu-Yuan Li , SH Chiou , HW Chang , SC Lo , CC Hsieh
DOI: 10.1016/J.JALLCOM.2014.10.004
关键词: Grain size 、 Phase (matter) 、 Niobium 、 Ab initio quantum chemistry methods 、 Magnetocrystalline anisotropy 、 Coercivity 、 Crystallography 、 Materials science 、 Doping 、 Condensed matter physics 、 Nanocrystalline material
摘要: Abstract SmCo7-based compounds are prototypical rare-earth based hard magnetic materials that the backbone of numerous devices and applications. We have found by doping SmCo7 phase with Niobium (e.g. SmCo6.7Nb0.3), enhanced coercivity being measured. Using a combination microstructural compositional characterization techniques ab initio calculations, we find Nb-doping stabilizes nanocrystalline nature material residing at 2e site structure, decreases average grain size, substantially increases magnetocrystalline anisotropy constant (K) from 1.25 × 107 erg/cm3 for to 1.40 × 107 erg/cm3 SmCo6.7Nb0.3). A significant enhancement in Nb is attributed increased K reduced size.
elsevier.com
sci-hub.se 参考文章(54)
Xiaoyan Song, Nianduan Lu, Wenwu Xu, Zhexu Zhang, Jiuxing Zhang, Phase transformation in nanocrystalline Sm2Co17 permanent magnet material Journal of Applied Crystallography. ,vol. 42, pp. 691- 696 ,(2009) , 10.1107/S0021889809020081
R. Gopalan, T. Ohkubo, K. Hono, Platelet microstructure and magnetic properties in rapidly solidified Sm20.8Co63.4Fe7.9Cu2.4Zr1.6B4 ribbons Scripta Materialia. ,vol. 53, pp. 367- 371 ,(2005) , 10.1016/J.SCRIPTAMAT.2005.03.050
J. Zhou, I. A. Al-Omari, J. P. Liu, D. J. Sellmyer, Structure and magnetic properties of SmCo7−xTix with TbCu7-type structure Journal of Applied Physics. ,vol. 87, pp. 5299- 5301 ,(2000) , 10.1063/1.373327
C. D. Graham, B. D. Cullity, Introduction to Magnetic Materials ,(1972)
M. Q. Huang, W. E. Wallace, M. McHenry, Q. Chen, B. M. Ma, Structure and magnetic properties of SmCo7−xZrx alloys (x=0–0.8) Journal of Applied Physics. ,vol. 83, pp. 6718- 6720 ,(1998) , 10.1063/1.367655
C. C. Hsieh, H. W. Chang, Z. H. Guo, C. W. Chang, X. G. Zhao, W. C. Chang, Crystal structure and magnetic properties of melt spun SmCo7−xMx (M=Ta, Cr, and Mo; x=0–0.6) ribbons Journal of Applied Physics. ,vol. 107, ,(2010) , 10.1063/1.3334543
J. Luo, J. K. Liang, Y. Q. Guo, L. T. Yang, F. S. Liu, Y. Zhang, Q. L. Liu, G. H. Rao, Crystal structure and magnetic properties of SmCo7−xHfx compounds Applied Physics Letters. ,vol. 85, pp. 5299- 5301 ,(2004) , 10.1063/1.1829157
Yongquan Guo, Wei Li, Weichun Feng, Jun Luo, Jingkui Liang, Qijun He, Xiaojun Yu, Structural stability and magnetic properties of SmCo7−xGax Applied Physics Letters. ,vol. 86, pp. 192513- ,(2005) , 10.1063/1.1926416
William A Goddard, Nature of the chemical bond ,(1986)
H.W. Chang, S.T. Huang, C.W. Chang, C.H. Chiu, I.W. Chen, W.C. Chang, A.C. Sun, Y.D. Yao, Comparison on the magnetic properties and phase evolution of melt-spun SmCo7 ribbons with Zr and Hf substitution Scripta Materialia. ,vol. 56, pp. 1099- 1102 ,(2007) , 10.1016/J.SCRIPTAMAT.2007.02.009