A NH4Ac-assisted solvothermal fabrication and properties of size-controlled cobalt ferrite nanospheres. Issue 1 (June 2015)

• Record Type: Journal Article
• Authors: Yan, Aiguo; Liu, Haomei
• Is Part Of: IOP conference series. Volume 87:Issue 1(2015)
• Publication Date: 2015-06
• Subjects: Materials science -- Periodicals; 620.1105
• DOI: 10.1088/1757-899X/87/1/012092
• Languages: English
• ISSNs: 1757-8981

Abstract

Abstract: Monodisperse cobalt ferrite nanospheres with the mean size 100 nm have been synthesized via a simple solvothermal method by using NH4 Ac 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·m 2 /kg and 14.6×10 3 A·m -1 (100 nm), 68.9 A·m 2 /kg and 49.9×10 3 A·m -1 (125 nm) and 72.5 A·m 2 /kg and 54.5×10 3 A·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.