Ternary compounds Ce0.67Pt2Al5 and Ce1.33Pt3Al8

The ternary intermetallic compounds Ce 0.67 Pt 2 Al 5 ( I ) and Ce 1.33 Pt 3 Al 8 ( II ) were synthesized in the Ce–Pt–Al system by the reaction of elemental Ce, Pt, and Al in an arc furnace under an argon atmosphere. The crystal structures of I and II were determined from single-crystal X-ray diffraction data. The crystals are characterized by the following unit cell parameters: a = 4.3105(18) A, c = 16.494(5) A, space group P 6 3 / mmc , Z = 2 ( I ) and a = 4.361(2) A, c = 39.00(2) A, space group R 3 ¯ m , Z = 6 ( II ). Both compounds have structures with different packing of layers.