Microwave-assisted combustion synthesis of Ni powder using urea

Sahu, Ranjan K and Ray, Ashok K and Das, Swapan K and Kailath, A J and Pathak, L C (2006) Microwave-assisted combustion synthesis of Ni powder using urea. Journal of Materials Research, 21 (7). pp. 1664-1673.

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A novel microwave-assisted combustion method was used to prepare Ni powder. The method involves the combustion reaction of nickel nitrate and urea as a fuel in the microwave field. The initiation of the exothermic peak of the combustion reaction was found to vary as a function of urea content. The microwave-prepared Ni powder was characterized using x-ray diffraction (XRD), scanning electron microscopy, atomic force microscopy, Fourier transform infrared spectroscopy, thermogravimetric (TG) analysis, differential thermal analysis (DTA), and magnetic measurement. The XRD pattern revealed that the Ni powder crystallizes with the cubic phase when the molar ratio of fuel to nitrate is varied between 5:1 and 6:1. Above or below that molar ratio, NiO phase coexists as an impurity along with the Ni phase. The magnetization value of Ni measured at room temperature is 53.5 Am-2/kg, which is close to the value observed for commercial Ni powder (55.0 Am-2/kg). The mechanism for the formation of the Ni and NiO phase is discussed based on the infrared, TG, and DTA data. The method shows that highly pure Ni powder can be prepared using urea as a fuel and microwaves as a source of energy via the solution combustion method.

Item Type:Article
Official URL/DOI:DOI: 10.1557/JMR.2006.0211
Uncontrolled Keywords:Magnetic-Properties; Borohydride Reduction; Nonaqueous Media; Nickel; Metal; Particles; Chemistry; Precursor; Complex; Ions
Divisions:Material Science and Technology
ID Code:3399
Deposited By:Sahu A K
Deposited On:19 Jul 2011 12:21
Last Modified:08 Feb 2012 17:18
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