chemico- thermal synthesis of nano-structured cobalt with distinct magnetic property

the synthesis of nano- structured cobalt through a controlled chemical process followed by heat treating at various temperatures is studied. the product is characterized by icp, xrd, fesem , and tem, indicating that the as- synthesized particles have an amorphous structure with 1.76 for co/b ratio, an average size of 50 nm. the transformation of intermediate phases into single phase nano- crystalline metallic cobalt during the heat treatment is investigated by dsc analysis. the mean crystallite size of obtained cobalt was 30 nm. the decrease in coercivity (4344.93a/mf) with the sharp increase in saturation magnetization (1.41×10-4 am2/kg) presents excellent ferro- magnetic properties for nano- crystallite cobalt.