Nd-Fe-B systems

Fig. 3. Projection of the liquidus surface of the Fe-rich comer of the Nd-Fe-B system. (After Schneider...

Fig. 4. (a) Vertical section in the Nd-Fe-B system corresponding to stable reactions and an Nd/B ratio equal to 2. (b) Vertical section corresponding to... 

Magnets based on the Nd-Fe-B system are basically metallic, and they are prepared by metallurgical techniques. The teclmique for introducing boron atoms into the structure is basically that of alloy making. Except for second-phase formation, the boron atoms naturally find their sites in the crystal structure during the formation of the 2-14-1 phase as a result of thermodynamic stability. 

Fig. 29. Relationship between the velocity of the solidification front and the Nd concentration in Nd-Fe-B system (Umeda et al. 1996).

They improved their method by using finer magnetic elements, and developed a representation for the local demagnetizing field (Fukunaga and Kanai 1998). They concluded that a magnet composed of 60% soft and 40% hard grains with a grain size around 20 nm should be the best nanocomposite microstructure for the Nd-Fe-B system. 

Phase equilibria in the Nd-Fe-B system as shown in fig. 38 were determined by Chaban et al. (1980) by means of X-ray and metallographic analysis of arc melted... 

Hao] Hao, S., Xu, W, An Isobar-Isothermal Phase Diagram of the Nd-Fe-B System at Atmospheric Pressure and 1000°C , Zhongguo Xitu Xuebao (J. Chin. Rare Earth Soc.), 8(3), 200-205 (1990) (Phase Diagram, Phase Relations, 5)... 

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