Crystal structure of the
compound Tb0.67Pt2Al5
Chem.
Met. Alloys 2
(2009) 75-82
https://doi.org/10.30970/cma2.0096
Yuriy LUTSYSHYN, Yaroslav TOKAYCHUK, Roman
GLADYSHEVSKII
The crystal structure of the ternary compound
Tb0.67PtAl5 (structure type Sc0.6Fe2Si4.9,
hP20-4.67, P63/mmc, a
= 4.2734(10), c = 16.391(3) Å)
was refined from X-ray single-crystal diffraction data. It contains two kinds
of slab stacked along [001]: slightly puckered layers of composition PtAl2
and flat layers Tb0.67Al with disordered distribution of Tb atoms
and Al3 triangles. Using group-subgroup relations, a hypothetical
structure R2T6Al15
with fully ordered distribution of R
atoms and Al3 triangles was derived (oS92, Cmcm, a =
12.820, b = 7.4017, c = 16.391
Å). Both structures together with
some other structure types of ternary aluminides belong to a homologous series with the general formula R0.67TnM2n+1.
|
TbAl11Pt6Tb3 |
PtAl8Tb2 |
|
Al1Al6Pt2Tb2 |
Al2Al6Pt4Tb |
Al3Al5Pt3Tb2 |
|
Content of the unit cell and coordination
polyhedra of the atoms in the structure of the compound Tb0.67Pt2Al5.
Keywords
Aluminide / Terbium / Platinum / Single-crystal
X-ray diffraction / Crystal-chemical analysis