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Two ternary phases, designated 4 and 5 , were revealed in Al-Ti-Pt. The 4 -phase with equiatomic composition ͑i.e., AlTiPt͒ was found to have a hexagonal structure with a = 4.3908͑9͒ Å and c = 5.4823͑10͒ Å ͑space group P63/ mmc͒, and the 5 -phase, forming in a compositional range between ϳAl 14 Ti 58 Pt 28 and Al 21 Ti 63 Pt 16 , has a tetragonal structure ͑possible space groups P4 2 nm, P-4n2, and P4 2 / mnm͒. The refined lattice parameters for Al 15 Ti 60 Pt 25 are a = 9.7019͑20͒ Å and c = 5.0231͑13͒ Å.

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