Ternary compounds with Sc0.6Fe2Si4.9-type structure in the systems
Sm{Pd, Pt}Al

 

Chem. Met. Alloys 5 (2012) 98-102

 

Yuriy LUTSYSHYN, Yaroslav TOKAYCHUK, Roman GLADYSHEVSKII

 

Two new ternary samarium aluminides, Sm0.67Pd2Al5 and Sm0.67Pt2Al5, were synthesized. Their crystal structures were refined from X-ray powder diffraction data: structure type Sc0.6Fe2Si4.9, Pearson symbol hP20-4.67, space group P63/mmc, a = 4.3314(3), c = 16.423(2) Å for the Pd-containing compound and a = 4.2909(3), c = 16.447(1) Å for the Pt-containing compound. The structures are disordered with respect to the distribution of R atoms and Al3 triangles.

 

Unit cell and coordination polyhedra in the structures of Sm0.67Pd2Al5 and Sm0.67Pt2Al5 (either a Sm atom or an Al3 triangle (site Al1) is present)

 

Keywords

Aluminum / Samarium / Palladium / Platinum / X-ray powder diffraction / Crystal structure