Crystal structure of Ti 4 Ni 2 C.

Single crystals of the inter-metallic phase with composition Ti 4 Ni 2 C were serendipitously obtained by high-pressure sinter-ing of a mixture with initial chemical composition Ti 2 Ni. The Ti 4 Ni 2 C phase crystallizes in the Fd m space group and can be considered as a partially filled Ti 2 Ni structure with the C atom occupying an octa-hedral void. Ti 4 Ni 2 C is isotypic with Ti 4 Ni 2 O, Nb 4 Ni 2 C and Ta 4 Ni 2 C, all of which were studied previously by means of powder diffraction.