Ti5Al2C3: A New Ternary Carbide Belonging to MAX Phases in the Ti–Al–C
A new compound, Ti5Al2C3, is identified in the bulk sample prepared by reactive hot pressing a mixture of Ti,
Al and graphite powders with a nominal molar ratio of Ti:Al:C = 5:2.15:2.78 at 1580°C for 1 h. This compound follows
the crystal structure of other MAX phases. The lattice parameters are a = 0.3038 nm, c = 3.2261 nm, and the atomic positions are Ti1 at 4f (1/3, 2/3, 0.0208),
Ti2 at 4f (1/3, 2/3, 0.1778), Ti3 at 2d (2/3, 1/3, 0.25), Al at 4e (0, 0, 0.1035), C1 at 2a (0, 0, 0),
and C2 at 4e (0, 0, 0.2102).