The effects of the concentration of individual reactants on Fe-Ni-P-B nanoparticles fabricated by chemical reduction

The effects of concentrations or ratio of various reactants on the composit ion, particle size, morphology and crystalline structure of Fe-Ni-P-B nanop articles fabricated by chemical reduction (CR) were systematically studied. The experimental results indicate that varying the ratio of Ni2+/(Ni2+ + F e2+) can be used to control the ratio of Ni/(Ni + Fe) in the final products . It is also shown that the concentration of NaH2PO2 needs to be carefully controlled as any change will result in a large variation of composition in the final products. The reproducibility of CR for Fe-Ni-P-B system was als o studied. It seems, from analyzing the experimental data, that two process es, namely chemical and electrochemical, were involved during the preparati on. (C) 2001 Elsevier Science B.V. All rights reserved.