The reduction of cobalt molybdenum oxide under an ammonia atmosphere resulting in the formation of ternary interstitial nitride CoMoN was studied. Intermediate phases were identified by an in situ powder X-ray diffraction using a reaction chamber. It was supplemented by a thermogravimetric analysis of the process. The presence of intermediate phases, CoMoO, CoMoO, MoN, metallic cobalt, and CoMoN, was observed. A synthesis route of CoMoN by an ammonolysis method was proposed.
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