Abstract
Magnetic cobalt nitrides were synthesized via nitriding of cobalt particles under NH3 flux by a multi-step process that includes annealing at two temperatures: 823K and 623K. The phases Co4+xN and Co3N1+y were produced and their structure and magnetic properties were studied. Both phases are found to be ferromagnetic with saturation magnetization of 143Am2kg−1 and 33Am2kg−1 respectively and decompose above 650K, before attaining the Curie temperature. Self-consistent Density Functional Theory (DFT) calculations were performed to understand the nitrides structure and magnetic behavior dependence on stoichiometry. The results indicate that the magnetic behavior of the hexagonal nitride is strongly dependent on the nitrogen content. The comparison of the experimental lattice parameters and magnetization values with the DFT calculations allows to determine the stoichiometry of the prepared compounds.
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