Chemical Synthesis of magnetic Co and CoNi nanoparticles and their characterization

The synthesis of nanomaterials presents a great interest not only for elucidation of basic research problem, but also for practical applications. As a result of the special magnetic properties of small particles, magnetic nanomaterials such as iron, cobalt, nickel and alloys find promising use in various applications: ferrofluids, infor-mation storage media, magnetic refrigeration, magnetic resonance imaging, medicine etc. In solution chemical routes, carbonate coprecipitation method has been shown to be an attractive method because metals from carbonate solid solution readily which allows high cation homogenety in the precursor and has low formation temperature in the intend phase. Also, homogenous mixture of the constituent metal carbonates, hydroxides react to form a single phase mixed metal oxide when heated. In the present investiga-tion, nanocrystalline magnetic Co and CoNi particles are produced by the reduction of synthesized Co3O4 and Co2NiO4 with hydrogen gas at 250-550oC. Nanocrystalline Co3O4 and Co2NiO4, reduced Coand CoNi particles are studied by XRD, SEM, TEM & Chemical analysis. The magnetic properties of Co and CoNi particles are studied by XRD, SEM, TEM and chemical analysis.The magnetic properties of Co and CoNi particles are studied by XRD, SEM, TEM and chemical anal-ysis. The magnetic properties of CoandCoNi nanoparticles are investigated by Vibration Sample magnetometer VSM). The size of the magnetic nanoparticles is found to be 10-25nm. The particles are highly magnetic and stable