Magnetic State and Phase Composition of Co 3 C Nanoparticles

Nanoparticles Co 3 C were prepared using solid-phase synthesis under high pressure. The phase composition of the nanoparticles has been analyzed; the magnetization has been measured and 59 Со NMR spectra in a local field have been recorded. It is shown that Co 3 C is a ferromagnet with the Curie temperature T C = 498(10) K. The hyperfine fields and components of electric field gradient tensor were determined for two nonequivalent Co positions in the carbide. The obtained hyperfine fields correspond to the spin state of Co ions S = 1.