Crystal structures of the new intermetallics Ce₃Pt₅Al and Ce₃Pt₅Al₂

Chem. Met. Alloys 7 (2014) 15-19

https://doi.org/10.30970/cma7.0261

A. TURSINA, H. NOËL, E. MURASHOVA, Y. MOROZOVA, Y. SEROPEGIN

The crystal structures of the ternary intermetallics Ce₃Pt₅Al and Ce₃Pt₅Al₂ have been determined from single crystal X-ray diffraction data. Ce₃Pt₅Al is a new representative of the Ce₃Pd₅Si-type of structure: space group Imma, a = 7.3767(4) Å, b = 13.1733(8) Å, c = 7.5884(4) Å, Pearson symbol oI36. Ce₃Pt₅Al₂ crystallizes in the triclinic space group P-1 with a = 5.689(2) Å, b = 8.432(3) Å, c = 8.7103(13) Å, α = 102.31(2)º, β = 97.89(2)º, γ = 89.10(3)º (Pearson symbol aP20) and represents a novel structure type. In both structures, the coordination polyhedra are rather irregular. The structures of Ce₃Pt₅Al and Ce₃Pt₅Al₂ can be represented as packings of Ce-centered polyhedra.

Polyhedral representation of the structure of Ce₃Pt₅Al₂

Keywords

Cerium platinum aluminide / X-ray diffraction / Crystal structure / Ce₃Pt₅Al / Ce₃Pt₅Al₂