Fe_（1－x）Ni_x合金超细微粒的磁性及穆斯堡尔谱研究  

ANALYSIS OF MSSBAUER SPECTRA AND MAGNETIC PROPERTIES OF Fe 1-x Ni x ALLOY ULTRAFINE PARTICLES

作　　者：王锦辉[1,2] 陆怀先[1,2] 邓桂昌[1,2] 陈允鸿[1,2] 黄润生[1,2] 都有为[1,2] 

机构地区：[1]扬州大学师范学院物理系 [2]南京大学物理系

出　　处：《南京大学学报（自然科学版）》1996年第1期25-29,共5页Journal of Nanjing University（Natural Science）

摘　　要：气相蒸发法制备的Ｆｅ１－ｘＮｉｘ合金超细微粒，平均粒径约为２０ｎｍ。利用振动样品磁强计、ｘ射线衍射分析仪以及穆斯堡尔谱仪分析了样品的磁性、相组成随ｘ的变化关系。结果表明：８０Ｋ和２９５Ｋ温度下，ｘ＝０．１０样品为铁磁性的ｂ．ｃ．ｃ结构马氏体相与顺磁性的ｆ．ｃ．ｃ结构奥氏体相共存；当ｘ＝０．２５～０．３０，样品中只单独存在ｆ．ｃ．ｃ结构的顺磁相；ｘ≥０．５０时，样品为ｆ．ｃ．ｃ．结构的顺磁相和铁磁相共存。顺磁相被认为是反铁磁相温度超过Ｎｅｅｌ点形成的。Fe 1-x Ni x alloy ultrafine particles are prepared by gas evaporation method, whose average diameters are about 20nm. The relations between magnetic properties, phase structures and nickel content are analyzed by the vibrating sample magnetometer, X ray diffractometer and Mssbauer spectroscopy. The results show that, both at 80K and 295K, the ferromagnetic b.c.c. martensitic and paramagnetic f.c.c. austenitic phases coexist in the sample with x =0.10, as x =0.25～0.30, only f.c.c. paramagnetic phase exists, when x ≥0.50, the f.c.c. paramagnetic and ferromagnetic phases coexist. The paramagnetic phase is thought to be formed as the antiferromagnetic phase is beyond the Neel point. The trend of magneitc properties versus x curves agrees with the bulk metal.

关 键 词：超细微粒 相组成 磁性合金 磁性 穆斯堡尔谱 

分 类 号：TM274[一般工业技术—材料科学与工程]