回流法制备MnFe2O4纳米晶及磁性能

The Preparation and Their Magnetic Properties of MnFe_2O_4 Nanocrystallines via Refluxing Method

以NaOH为沉淀剂,通过一种简单的低温回流法制备了MnFe2O4纳米晶.采用XRD、SEM、FESEM、FTIR和VSM等手段对MnFe2O4纳米晶尺寸、晶相结构和磁性能进行了分析表征.结果表明,所制备的MnFe2O4纳米晶为尖晶石相结构,晶粒尺寸随着反应温度的升高而增大,从50℃的10 nm增大到90℃的22 nm;样品的饱和磁化度随温度的升高而增大.

A single phase MnFe2O4 nanocrystallines are synthesized by a simple refluxing route using NaOH as precipitant.The grain size,crystal structure and magnetic properties of the as-synthesized crystallines are investigated using X-ray diffraction （XRD）,scanning electron microscopy （SEM）,field emission scanning electron microscopy （FESEM）,FTIR and vibrating sample magnetomerter（VSM）.Our results show that the obtained MnFe2O4 nanocrystals possess spinel structure.The grain size of MnFe2 O4 nanocrystals increases with the increasing reaction temperature,and the mean grain size of MnFe2O4 nanocrystallines increases from about 10 to 22 nm when the reaction temperature increases from 50 to 90 ℃.The saturation magnetization of MnFe2O4 nanocrystallines increases with increasing the reaction temperature.