Tb0.67PdAl3
and Gd1.33Pt3Al8 with layers of
rare-earth-metal atoms and Al-atom triangles
Chem.
Met. Alloys 1
(2008) 303-316
https://doi.org/10.30970/cma1.0078
Yuriy LUTSYSHYN, Yaroslav TOKAYCHUK, Volodymyr DAVYDOV, Roman
GLADYSHEVSKII
The crystal structures of the ternary compounds
Tb0.67PdAl3 (hP14-4.67,
P63/mmc, a = 4.394(4),
c = 9.372(6) Å) and Gd1.33Pt3Al8
(hR51-14.00, R-3m, a = 4.3090(14), c = 38.54(2) Å) were
refined from X-ray single-crystal diffraction data. They contain monoatomic
layers stacked along [001] with ordered or disordered distribution of
rare-earth-metal atoms and Al-atom triangles. Together with the structures of Y2Co3Ga9,
Sc0.67Fe2Si5, Er4Pt9Al24,
and ErNi3Al9, they form a family of intergrowth structures
built up of three kinds of monoatomic layer. Analyzing the relative positions
of the monoatomic layers, some basic stacking rules, which may help to predict
new structures, are formulated.
The unit cell and coordination
polyhedra for atoms in the Tb0.67PdAl3
structure.
Keywords
Aluminide / Rare-earth metal / Noble metal /
Single-crystal X-ray diffraction / Intergrowth layered structure