Ternary compounds with Sc_0.6Fe₂Si_4.9-type structure in the systems
Sm–{Pd, Pt}–Al

Chem. Met. Alloys 5 (2012) 98-102

https://doi.org/10.30970/cma5.0222

Yuriy LUTSYSHYN, Yaroslav TOKAYCHUK, Roman GLADYSHEVSKII

Two new ternary samarium aluminides, Sm_0.67Pd₂Al₅ and Sm_0.67Pt₂Al₅, were synthesized. Their crystal structures were refined from X-ray powder diffraction data: structure type Sc_0.6Fe₂Si_4.9, 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 Sm_0.67Pd₂Al₅ and Sm_0.67Pt₂Al₅ (either a Sm atom or an Al₃ triangle (site Al1) is present)

Keywords

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