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本文报道利用单辊方法制备的非晶Nd3Fe81B16合金的晶化及其对磁性和M?ssbauer谱的影响。发现在非晶Fe81B19合金中用3at％Nd取代B,使非晶Fe81B19合金的晶化温度提高88℃。在适当的退火条件下晶化后样品在室温下的磁性是:σs=189emu/g,σr/σs=0.7,iHc=2.15kOe,Br≈12kG,bHc=2kOe,(BH)max≈8MGOe。与目前广泛使用的六角铁氧体相比,bHc相近,但Br和(BH)max远比六角铁氧体高。这种材料仅含有少量的Nd,因此可能开发为一种新的廉价永磁材料。本文对少量Nd的添加对非晶FeB合金的晶化温度,磁性和M?ssbauer谱的影响进行了讨论。初步探讨了高矫顽力的来源,认为它的磁化和反磁化过程可以用畴壁钉扎理论解释。Crystallization and its influence on magnetic properties and M?ssbauer spectra in the rapidly solidified amorphous Nd3Fe81B16 alloys are reported. The addition of 3at% Nd to FeB alloys raises the crystallization temperature from 435℃ for Fe81B19 to 523℃ for Nd3Fe81B16. After the crystallization at the optimal annealing condition the magnetic properties as permanent magnet were obtained to be: Br≈12kG, bHc = 2 kOe, and (BH)max≈8 MGOe, with room temperature seturation magnetization σs = 189 emu/g, remanence ratio σr/σs = 0.7 and intrinsic coercivity iHc = 2.15kOe. Comparing with widely used anisotropic BaFe12O19 ferrite, its Br and (BH)max is much higher. Therefore this material may be developed into a new cheap pe manent magnet. The influence of small addition of Nd on the physical properties of the alloys-are discussed. Based on the data from X-ray diffraction, M?ssbauer spectrocopy, SEM and magnetic measurments, the mechanism controlling the magnetization and demagnetization processes is thought to be domain wall pinning.
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