We have been able to prepare nanoparticles (∼4nm diameter) of cubic γ-Mo2N by a simple procedure involving the reaction of MoCl5 with urea at 873K. The nanoparticles show a superconducting transition around 6.5K. The γ-Mo2N nanoparticles are readily transformed to nanoparticles of δ-MoN with a slightly larger diameter on heating in a NH3 atmosphere at 573K. Phase-pure δ-MoN obtained by this means shows a superconducting transition around 5K.
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