A NH4Ac-assisted solvothermal fabrication and properties of size-controlled cobalt ferrite nanospheres

2015 Global Conference on Polymer and Composite Materials

材料科学;化学

Yan, Aiguo^1 ; Liu, Haomei^2

School of Materials Science and Engineering, Xiamen University of Technology, Xiamen, Fujian

361024, China^1

Personnel Department, Xiamen University of Technology, Xiamen, Fujian

361024, China^2

关键词: Adsorption properties;    Different sizes;    Magnetic studies;    Maximum magnitudes;    Microwave absorption properties;    Protective agents;    Solvothermal fabrications;    Solvothermal method;   

Others  :  https://iopscience.iop.org/article/10.1088/1757-899X/87/1/012092/pdf
DOI  :  10.1088/1757-899X/87/1/012092

学科分类：材料科学（综合）

来源: IOP

【 摘 要 】

Monodisperse cobalt ferrite nanospheres with the mean size 100 nm have been synthesized via a simple solvothermal method by using NH4Ac as protective agent. The sizes of the particles can be controlled from 20 to 200 nm by changing reaction time or protective agents. Magnetic and microwave absorption properties of Co ferrite nano spheres with the different sizes were investigated in details. Magnetic studies revealed that the saturation magnetization (Ms) and the coercivity (Hc) increased with the increase in particle size, that is, the Ms and Hc are 53.5 A•m2/kg and 14.6×103A•m-1(100 nm), 68.9 A•m2/kg and 49.9×103A•m-1(125 nm) and 72.5 A•m2/kg and 54.5×103A•m-1(200 nm), respectively. Electromagnetic and resulting microwave adsorption properties showed that the maximum magnitudes of the dips are -11.96 dB (at 9.00 GHz for 100 nm), -23.02 dB (at 5.55 GHz for 125nm), and -32.79 dB (at 10.47 GHz for 200 nm), respectively.