中文摘要：

采用水热法制备尖晶石CoFe2O4纳米颗粒，通过改变合成温度（140-200℃）和原料中钴的含量，借助X射线衍射仪、场发射扫描电子显微镜、透射电镜和振动磁强计等研究上述两个因素对合成颗粒结构、形貌及磁性能的影响，并从机制上加以解释。结果表明：水热法合成的CoFe2O4纳米颗粒平均粒径在30-40nm之间，提高原料中钴的含量有利于去除d-Fe2O3相；随合成温度的升高，该颗粒的饱和磁化强度持续增大，最高为59．694Am^2·kg^-1矫顽力先升后降，最高可达1273．28A·m^-1。

英文摘要：

Spinel CoFe2O4 nanoparticles were synthesized by hydro-thermal method. The effects of synthetic temperature and Co contents in raw materials on the structure, morphology and magnetic properties of synthetic particles were studied by X-ray diffractometer, field emission scanning electron microscopy, transmission electron microscopy and vibration magnetometer, changing synthetic temperature （140- 220℃） and Co contents in raw materials, and the effects were explained in mechanism. The results show that the average grain size of CoFe2O4 nanoparticles synthesized by hydro-thermal method was between 30 nm and 40 nm. It was advantageous to raise Co contents in raw materials for removing a-Fe2O3 phase. The saturation magnetization of particles raised continually with the increase of the synthetic temperature and its maximum was 59. 694 Am^2 · kg^-1 , the coercive force raised first and dropped later and its maximum was 1 273.28 A · m^-1.