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用熔炼和甩带的方法制备了组分为Ni50 FexMn2 5-xGa2 5(x =0— 2 5 )的系列样品 .x射线衍射实验结果表明 ,当Fe取代Mn的含量x <17时 ,用熔炼和甩带的方法均能合成高度有序的L2 1 结构的Heusler相 .而当x >17时 ,普通熔炼方法只能得到低有序度的γ相 ,只有采用甩带急冷的方法才能获得高度有序的纯L2 1 结构的化合物 .根据交流磁化率和分子磁矩的测试结果 ,初步分析了Fe原子对化合物磁性的贡献 ,认为Fe原子占据了Mn原子的位置后 ,具有高于一般含铁合金的原子磁矩 ,可达 2 5 5— 3 5 5 μB.
A series of samples with Ni50FexMn2 5-xGa2 5 (x = 0-2 5) were prepared by melting and quenching methods.The results of x-ray diffraction experiment show that when the content of Fe substituted for Mn is less than 17, And the rejection method can synthesize Heusler phase with highly ordered L2 1 structure.When x> 17, the ordinary melting method can only get a low degree of γ phase, and only using the quenching method to get the height Orderly pure L2 1 structure of compounds.According to the exchange susceptibility and molecular magnetic moment of the test results, preliminary analysis of the contribution of Fe atoms on the magnetic properties of the compound that the Fe atoms occupy the position of Mn atoms, with higher than the general ferrous alloys The atomic magnetic moment, up to 2 5 5- 3 5 5 μB.