In situ high-pressure Recently, titanium nitride has aroused intensive interests because of its simple structure and special properties such as high melting point, high hardness, high corrosion resistance, high specific strength, and metallic conductivity. Like most of refractory transition metal nitrides with NaCl-type structure, TiN is a superconductor with transition temperature about 5 K. TiN x keeps NaCl-type structure at a variant of N content (0.6