Al^3＋代换Fe^3＋对钴铁氧体结构与磁性能的影响  

The influence of Al^(3+) substituted for Fe^(3+) on the structure and magnetic properties of cobalt ferrite

作　　者：焦永芳[1] 吴延昭[1] 方庆清[2] 

机构地区：[1]天津科技大学理学院,天津300222 [2]安徽大学物理与材料科学学院,合肥230039

出　　处：《天津师范大学学报（自然科学版）》2008年第1期40-42,共3页Journal of Tianjin Normal University：Natural Science Edition

基　　金：天津科技大学基金资助项目(20060441)

摘　　要：采用化学共沉法制备了CoFe2-xAlxO4(x=0.1~0.5)铁氧体纳米粉料,并在不同温度下进行退火处理,利用X射线衍射仪(XRD)、振动样品磁强计(VSM)对样品的结构和磁性进行了测量和分析.结果表明:所有样品均形成了单一的尖晶石相,晶粒尺寸为35~45 nm;经1 280℃退火后的样品能同时获得较高的比饱和磁化强度σS和矫顽力Hc;随铝代换量x的增大,比饱和磁化强度起初变化平缓然后迅速降低,而矫顽力却呈现出了先增后减的趋势,在x=0.3附近出现峰值.Cobalt ferrite CoFe2-x AlxO4 （x=0. 1--0. 5） nanocrystalline powders were prepared by chemical coprecipitation method and annealed at different temperature in air. The structure and magnetic properties of the samples were measured and analyzed through the X-ray diffraction （XRD） and vibrating sample magnetometer （VSM）. The experimental results showed that monophase CoFe2-x AlxO4 ferrites with spinel structure were formed for all the samples and the grain size was in the range of 35-45 nrn. Higher specific saturation magnetization as and coercivity Hc were obtained simultaneously when the samples were annealed at 1 280 ℃. With the increasing of x, as remained a flat state at the beginning and then decreased rapidly, while Hc increased at the beginning and then decreased, and the maximum of Hc was attained at x=0. 3.

关 键 词：铁氧体 化学共沉法 磁性能 

分 类 号：TM277[一般工业技术—材料科学与工程]