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Pure fcc-Co was successfully synthesized by a novel sodium formate reduction method. The effect of the concentration of Co2+ on phase structure, morphology and magnetic properties of Co particles was investigated by using XRD, TEM and VSM. The pure Co without any impurity is found to stabilize always in fee structure when the concentration of Co2+ varies from 0.012 mol/L to 0.108 mol/L. The Co particles exhibit an excel- lent soft magnetic property, i.e., Ms = 1 63.8 A • m²/kg and Hci = 10.4 A/m, at the Co2+ concentration of 0.108 mol/L. Moreover, it is revealed that the formation of pure fcc-Co is mainly attributed to the moderate reduction rate (about 0.014 mol/(L • h)) using sodium formate as the reducing agent and slow cooling rate during the reaction. [ABSTRACT FROM AUTHOR]