γ’-Fe_4N磁粉的超精细结构及结构转变

HYPERFINE STRUCTURE AND STRUCTURAL TRANSI TION OF γ'-Fe_4N MAGNETIC POWDER

以铁粉氮化法制备γ’－Ｆｅ４Ｎ磁粉，用 Ｍｏｓｓｂａｕｅｒ谱学配合 Ｘ射线衍射方法研究了γ’－Ｆｅ４Ｎ的超精细结构及其变化．结果表明：γ’－Ｆｅ４Ｎ中存在着三种可区别的 Ｆｅ原子组态。球磨及真空退火处理 γ’－Ｆ６４Ｎ和α－Ｆｅ混合粉末，可生成含α”－Ｆｅ１６Ｎ２的复合氮化铁磁粉．

The γ'-Fe4N magnetic powder has been prepared by nitrization of iron powder. The hyperfine structure and structural transition of γ'-Fe4N were investigated by Mossbauer spectroscopy and X-ray diffraction. The results show that there are three kinds of Fe atomic configuration in γ'-Fe4N. The composite iron nitride magnetic powder contained α'-Fe16N2 can be formed by ball milling and vacuum annealing the mixture powder of γ'-Fe4N and α-Fe.