体状 γ-Fe(N)和 Fe_4N 的合成及其磁特性  

Synthesis and Magnetic Characterization of γ Fe(N) and Fe 4N in Bulk Form

作　　者：周桂琴[1] 高强[2] 连法增 

机构地区：[1]东北大学材料与冶金学院 [2]上海交通大学

出　　处：《东北大学学报（自然科学版）》1998年第4期388-391,共4页Journal of Northeastern University(Natural Science)

基　　金：冶金部重点课题资助项目

摘　　要：利用固气反应原理和方法制备ＦｅＮ化合物．反应气氛为ＮＨ３，Ｈ２，［Ｎ］和［Ｈ］的混合物．分析了ＮＨ３的分解过程及［Ｎ］和Ｆｅ的反应．当ＮＨ３／［ＮＨ３＋Ｈ２］的比例为５％～１５％（体积百分数）和反应温度为６４０～６８０℃时，通过水淬或冰水淬可得到几乎纯净的体状γＦｅ（Ｎ）．当ＮＨ３／［ＮＨ３＋Ｈ２］为１６％～５０％和反应温度为４００～６４０℃时，均匀、单一且纯的Ｆｅ４Ｎ体状化合物可以得到．研究了工艺条件对制备氮化物的影响规律．结果表明：γＦｅ（Ｎ）是非磁性的，Ｆｅ４Ｎ是铁磁性的．其饱和磁化强度、居里温度和矫顽力室温下分别为１８６Ａ·ｍ２／ｋｇ，４８０℃和０３９ｋＡ／ｍ．Fe N compounds were synthesized by solid gas reaction method. The reaction atmosphere was the mixture of NH 3,H 2, and . The processes of decomposition of NH 3 and reaction of and Fe were analyzed. When the ratio of NH 3/[NH 3+H 2] was 5%～15% (vol.) and the reaction temperature of Fe and was at 640～680℃,almost pure γ Fe(N) could be obtained by water or icewater quenching. When ratio of NH 3/[NH 3+H 2] was 16%～50% (vol.) and the reaction of Fe and was at 400℃～640℃,pure Fe 4N was synthesized. The change of the structures and magnetic properties of γ Fe(N) and Fe 4N at wide range of temperature was studied. The γ Fe(N) was nonmagnetic. The Fe 4N was ferromagnetic. The saturation moment,Curie temperature and coercivity of Fe 4N were 186Am 2/kg,480℃ and 0 39kA/m at room temperature,respectively.

关 键 词：相结构 磁性 铁氮化合物 

分 类 号：O614.811[理学—无机化学]