TRANSITION METAL NITRIDE, FUEL CELL SEPARATOR, FUEL CELL STACK, FUEL CELL VEHICLE, METHOD OF PRODUCING TRANSITION METAL NITRIDE, AND METHOD FOR PRODUCING FUEL CELL SEPARATOR

摘要

Disclosed is a transition metal nitride obtained by nitriding the surface of a base which is composed of a transition metal or an alloy of a transition metal. The transition metal nitride has an M4N-type crystal structure and an .epsilon.-M2-3N-type crystal structure, and is formed all over the base surface continuously from the surface to the inside in the depth direction.