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。
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.
参考文献
| [1] | A. Morisako;N.N. Shams;Y. Miura .C-axis oriented Ba-ferrite thin film with small grain for perpendicular magnetic recording[J].Journal of Magnetism and Magnetic Materials,2004(3):2191-2193. |
| [2] | Rana S;Gallo A;Srivastava RS;Misra RD .On the suitability of nanocrystalline ferrites as a magnetic carrier for drug delivery: functionalization, conjugation and drug release kinetics.[J].Acta biomaterialia,2007(2):233-242. |
| [3] | Dong-Lin Zhao;Ojang Lv;Zeng-Min Shen .Fabrication and microwave absorbing properties of Ni-Zn spinel ferrites[J].Journal of Alloys and Compounds,2009(2):634-638. |
| [4] | 李永军,刘河洲,李华,李卞,路雁雁.钡铁氧体包覆多壁碳纳米管复合材料的合成与表征[J].机械工程材料,2010(01):88-91. |
| [5] | Y. Cedeno-Mattei;O. Perales-Perez .Synthesis of high-coercivity cobalt ferrite nanocrystals[J].Microelectronics journal,2009(4/5):673-676. |
| [6] | Mohamed, RM;Rashad, MM;Haraz, FA;Sigmund, W .Structure and magnetic properties of nanocrystalline cobalt ferrite powders synthesized using organic acid precursor method[J].Journal of Magnetism and Magnetic Materials,2010(14):2058-2064. |
| [7] | Lee JG.;Kim CS.;Park JY. .Growth of ultra-fine cobalt ferrite particles by a sol-gel method and their magnetic properties[J].Journal of Materials Science,1998(15):3965-3968. |
| [8] | Rajendran M.;Bhattacharya AK.;Das D.;Chintalapudi SN. Majumdar CK.;Pullar RC. .Magnetic properties of nanocrystalline CoFe2O4 powders prepared at room temperature: Variation with crystallite size[J].Journal of Magnetism and Magnetic Materials,2001(1/2):71-83. |
| [9] | 段红珍,李巧玲,蔺向阳,李凤生.钴铁氧体纳米粒子制备及其镧掺杂的磁性能研究[J].材料科学与工艺,2009(01):88-91. |
| [10] | Ji GB;Tang SL;Ren SK;Zhang FM;Gu BX;Du YW .Simplified synthesis of single-crystalline magnetic CoFe2O4 nanorods by a surfactant-assisted hydrothermal process[J].Journal of Crystal Growth,2004(1/2):156-161. |
| [11] | 吕庆荣,方庆清,李瑞,王翠平.钴铁氧体纳米晶粒的结构及磁特性研究[J].安徽大学学报（自然科学版）,2006(02):71-74. |
| [12] | Magnetic properties and magneto-optical effect of Co_(0.5)Fe_(2.5)O_(4) nanostructured films[J].Applied physics letters,2003(21):3707-3709. |
| [13] | Zhao, LJ;Zhang, HJ;Xing, Y;Song, SY;Yu, SY;Shi, WD;Guo, XM;Yang, JH;Lei, YQ;Cao, F .Studies on the magnetism of cobalt ferrite nanocrystals synthesized by hydrothermal method[J].Journal of Solid State Chemistry,2008(2):245-252. |
| [14] | Cote LJ.;Teja AS.;Wilkinson AP.;Zhang ZJ. .Continuous hydrothermal synthesis of CoFe2O4 nanoparticles[J].Fluid Phase Equilibria,2003(2):307-317. |
| [15] | Lee DH.;Lee JY.;Yo CH.;Kim KH.;Kim HS. .CHARACTERIZATION OF THE MAGNETIC PROPERTIES AND TRANSPORT MECHANISMS OF COXFE3-XO4 SPINEL[J].Solid State Communications,1995(7):445-449. |
| [16] | 金沈贤,钟智勇,张怀武.锰掺杂钴铁氧体粉体的磁性能和介电性能[J].硅酸盐学报,2007(07):838-842. |
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