S. Jani, Sudeesh, J. Nehra, N. Lakshmi, R. Brajpuriya
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引用次数: 0
摘要
采用高能球磨法制备FeAl纳米体系，在空气环境中分别处理5、15和20 h，观察其与大气氧的力学化学反应及其对体磁性能的影响。利用振动样品磁强计和穆斯堡尔谱两种互补技术对氧化Fe-Al粉末的相应磁性能进行了详细分析。在8 nm粒径处，随着bcc Fe/Al峰的出现，还观察到Fe- o, Fe2O3相的痕迹。体磁性能值的巨大差异可归因于不同水平的非磁性铁氧化物的存在，这有效地降低了所制备纳米系统的体磁化强度(即未研磨的70%)。
Contamination from the Milling Atmosphere and its Effect on Magnetic Properties of Fe/Al Nanopowders
FeAl nanosystems had been prepared by means of high energy ball milling for 5, 15, and 20 h in air environment to observe mechanochemical reactions with atmospheric oxygen and its effect on bulk magnetic properties. The detailed analysis of the corresponding magnetic properties of oxidized Fe-Al powders was carried out by means of two complementary techniques: vibrating sample magnetometer (VSM) and Mossbauer spectroscopy. At 8 nm particle size, along with bcc Fe/Al peaks, the traces of the Fe-O, Fe2O3 phases also have been observed. The large differences in values of bulk magnetic properties can be ascribed to the presence of nonmagnetic Fe oxides at different levels which deteriorates bulk magnetization (i.e>70% of an unmilled) of the prepared nanosystems effectively.
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