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In this work, high quality VIB TM nitrides are successfully synthesized by metathesis reaction of chromium chlorides CrCl3, metal oxides Mo2O3, W2O3 and sodium azide respectively, under high pressure and high temperature.c-WN is obtained by an degassing reaction from W2N3.Vickers hardness measurement indicates MoN most hardness among three compounds.The difference between these equal-exoelectron VIB TM mono-nitrides is analyzed by bader analysis, electronic localization function (ELF), partial density of states (PDOS).