CHARACTERISTICS AND SYNTHESIS OF Cu-Ni FERRITE NANOPOEDERS BY COPRECIPITATION METHOD WITH ULTRASOUND IRRADIATION

초록

Ultrasonic irradiated in a liquid produces the cavitation process[1]. The cavitation leads to hot-spot and microjet impacts on the materials which can result in reaction activating, particle size reduction, surface cleaning, and so on. In this study, Cu-Ni ferrite (Cu1-xNixFe2O4) nanopowders were prepared by coprecipitation method with ultrasound irradiation. The crystal structure, the microstructure, and magnetic property of synthesized powders were characterized by X-ray diffraction, Scanning electron microscopy, and Vibrating sample magnetomery. The ammonium hydroxide was used for precipitator not to decay the tip of ultrasonic horn as it was coprecipitated with ultrasound irradiation. pH value of precipitator is needed 12,5 or more to coprecipitate completely. Fixed amount or more of NH4OH didn’t synthesize ferrite nanopowders. Because the ferrite nanopowders makes complex ion with metallic ion like Cu2+. The synthesized ferrite nanopowders by coprecipitation method with ultrasound irradiation on the condition that complex ion isn’t made were 20~30nm in the particle size and identified as a spinel structure by X-ray diffraction. They showed the saturation magnetization of x = 0 ; 53 emu/g, x = 0.5 ; 73.5 emu/g, x = 1 ; 34 emu/g. But Cu1-xNixFe2O4 ferrite nanopowders coprecipitation without ultrasound irradiation weren’t synthesized. The Cu1-xNixFe2O4 nanopowders showed property of the electromagnetic wave absorbing on GHz, and the matching frequency and thickness of the Cu1-xNixFe2O4 nanopowders had changed sensitivly according to the variation of x. [1] D. Peters. J. Mater. Chem. 6 (1996) 1605