Coercivity generation of surface Nd2Fe14B grains and mechanism of fcc-phase formation at the Nd/Nd2Fe14B interface in Nd-sputtered Nd–Fe–B sintered magnets
作者： Tomoki Fukagawa , Satoshi Hirosawa
DOI: 10.1063/1.2952556
关键词: Magnet 、 Materials science 、 Crystallography 、 Transmission electron microscopy 、 Surface energy 、 Sputter deposition 、 Atmospheric temperature range 、 Lattice constant 、 Grain boundary 、 Coercivity 、 Composite material
摘要: The coercivity of surface grains a Nd–Fe–B sintered magnet can be measured unequivocally if the is thin slab with orientation its c-axis parallel to largest surface. Due loss part neodymium-rich grain boundary phase, Nd2Fe14B have low after machining. When Nd layer sputter deposited on and annealed in temperature range from 500 675 °C, recovers full value, which identical bulk was cut. Transmission electron microscopy has indicated formation fcc interfacial phase having lattice constant a=0.548 nm between specimen whose recovered. In addition double hexagonal closed packed (metallic Nd), A-type Nd2O3 been observed inner region film away interface. structure a=0.382 nm c=0.5...
scitation.org
harvard.edu
aip.org
sci-hub.se 参考文章(14)
Pierre Villars, L. D. Calvert, Pearson's handbook of crystallographic data for intermetallic phases ,(1985)
P. Schrey, TEM studies of sintered Fe-Nd-B magnets IEEE Transactions on Magnetics. ,vol. 22, pp. 913- 915 ,(1986) , 10.1109/TMAG.1986.1064431
D. Lemarchand, P. Vigier, B. Labulle, On the oxygen stabilized Nd-Rich Phase in the Nd-Fe-B (-0) permanent magnet system ieee international magnetics conference. ,vol. 26, pp. 2649- 2651 ,(1990) , 10.1109/20.104826
Weizhong Tang, Shouzeng Zhou, Run Wang, On the neodymium-rich phases in NdFeB magnets Journal of The Less Common Metals. ,vol. 141, pp. 217- 223 ,(1988) , 10.1016/0022-5088(88)90407-9
R. Ramesh, J. K. Chen, G. Thomas, On the grain‐boundary phase in iron rare‐earth boron magnets Journal of Applied Physics. ,vol. 61, pp. 2993- 2998 ,(1987) , 10.1063/1.337849
M. Sagawa, S. Fujimura, N. Togawa, H. Yamamoto, Y. Matsuura, New material for permanent magnets on a base of Nd and Fe (invited) Journal of Applied Physics. ,vol. 55, pp. 2083- 2087 ,(1984) , 10.1063/1.333572
X.J. Yin, I.P. Jones, I.R. Harris, The microstructural characterisation of Nd-Fe-B alloys. II: Microstructural investigation of cast Nd-Fe-B materials Journal of Magnetism and Magnetic Materials. ,vol. 125, pp. 91- 102 ,(1993) , 10.1016/0304-8853(93)90822-J
M. Ramesh, L. Påst, P.E. Wigen, The effect of cubic anisotropy on the coupled domain-domain wall oscillations Journal of Magnetism and Magnetic Materials. ,vol. 54, pp. 1205- 1206 ,(1986) , 10.1016/0304-8853(86)90785-7
Weizhong Tang, Shouzeng Zhou, Run Wang, C. D. Graham, An investigation of the Nd‐rich phases in the Nd‐Fe‐B system Journal of Applied Physics. ,vol. 64, pp. 5516- 5518 ,(1988) , 10.1063/1.342321
S. Hirosawa, T. Fukagawa, T. Maki, Recent developments toward understanding magnetization processes in Nd-Fe-B permanent magnet materials Physica Status Solidi (c). ,vol. 4, pp. 4606- 4610 ,(2007) , 10.1002/PSSC.200777406