X-Ray Diffraction, Mossbauer and Magnetization Studies of Nanocrystalline Fe_(33)Ge_(67) Alloy Prepared by Mechanical Alloying

摘要

The nanocrystalline Fe_(33)Ge_(67) alloy was prepared by mechanical alloying and its formation was followed by X-ray diffraction, ~(57)Fe Mossbauer spectroscopy and magnetization techniques. The room-temperature Mossbauer spectra revealed the formation of a broad single line at the expense of the area of α-Fe sextet. Combination of the measured room-temperature saturation magnetization values together with those for the area of α-Fe sextet has shown that the consume of the α-Fe for the formation of the Fe_(33)Ge_(67) alloy follows a linear relationship. Low temperature ~(57)Fe Mossbauer spectroscopy reveals the well-known antiferromagnetic ordering of the Fe_(33)Ge_(67) phase and the possible existence of superparamagnetic particles of Fe_(33)Ge_(67).