Ternary compounds with Sc0.6Fe2Si4.9-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,
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