Crystal structures of the new intermetallics Ce3Pt5Al and Ce3Pt5Al2

 

Chem. Met. Alloys 7 (2014) 15-19

 

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, 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