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In this study,CFO nano-particles were prepared by hydrothermal method.The morphologies of the asprepared nano-particles were observed by SEM.By changing the concentration of precursor,the reaction time and temperature,the effects of these three parameters on the morphologies as well as the sizes of the products were investigated.We find that the CFO nano-particles grow to be larger particles with these three parameters increasing.Only when the reaction time and temperature are 16h and 200oC,the CFO nanoparticles are like to be spherical and in good dispersion.The size is close to 100 nm.