Abstract
Abstract The intermetallic nitrides Fe3Mo3N and Co3Mo3N were synthesized by the ammonolysis of the ternary oxide precursors FeMoO4 and CoMoO4 as well as by plasma nitridation of the oxide precursors. The structures of Fe3Mo3N and Co3Mo3N were determined from the simultaneous Rietveld refinements of powder X-ray and neutron diffraction data. Both compounds were found to be isostructural with η-Fe3W3C which crystallizes with cubic symmetry in the space group Fd 3 m with Z=16. The lattice parameters were found to be a=11.0859(3) A and a=11.0270(6) A for Fe3Mo3N and Co3Mo3N, respectively. The general atomic positions that gave the best refinement for the intermetallic nitrides M3Mo3N are Mo on 48f, M on 32e and 16d and N on 16c. The structure consists of corner shared NMo6 octahedra with the metal atoms occupying the sites between the octahedra. Magnetic susceptibility data for Co3Mo3N was found not to follow the Curie law.
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