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Fe3Mo3C has been prepared and its activity for ammonia synthesis was evaluated.As had been observed previously for Co3Mo3C,it was found to be inactive at 400℃.At 500℃ activity developed and this can be related to the substitution of lattice carbon by nitrogen.Application of a simple topotactic route to prepare Ni2Mo3C from Ni2Mo3N proved unsuccessful,with the resultant carbonitride formed under optimal synthesis conditions being active for ammonia synthesis at 400℃.