Kamerlingh Onnes Laboratory, Leiden University, POB 9506, 2300 RA Leiden, The Netherlands
Published in Nature 376 (1995) 729 titel Composition and tempering of Fe-C and Fe-Ni-C fine particles prepared by spark erosion. auteur M. Kocova(2), N. Pizurova(2), S. Sullow(1) and O. Schneeweiss(2) adres (1) Kamerlingh Onnes Laboratorium, Leiden University, P.O. Box 9506, 2300 RA Leiden, The Netherlands. (2) Institute of Physics of Materials, Academy of Sciences of the Czech Republic, Zizkova 22, 61662 Brno, Czech Republic. ref Materials Sci. and Eng. A 190 (1995) 259
Fe-C and Fe-Ni-C powders prepared by spak synthesis from pure Fe, Fe-Ni and C as electrodes were investigated. They exhibit a wide variety of particles differing in form, size and phase composition. The as-prepared powders consist of graphite, carbides, \alpha- and \gamma-Fe, non- magnetic phases and a new ferromagnetic component. Carbides dominate among the ferromagnetic phases. The fractions exhibiting superparamagnetic behaviour contain fine Fe and Fe-C particles in graphite. Changes in the phase composition due to tempering at elevated temperatures lead to the Fe-C equilibrium.