Crystal structure of Dy2Ga1.8Ge5.2
Chem.
Met. Alloys 6 (2013) 220-224
https://doi.org/10.30970/cma6.0286
Yaroslav TOKAYCHUK, Taras DELENKO, Roman GLADYSHEVSKII
A new ternary intermetallic
compound, Dy2Ga1.8Ge5.2, was synthesized and its crystal structure
determined from X-ray powder diffraction data: structure type Sm2(Ga0.26Ge0.74)7,
Pearson symbol oS80-8,
space group Cmce,
a = 8.3284(6),
b = 8.0320(6),
c = 20.9167(15) Å, Z = 8.
The structure type Sm2(Ga0.26Ge0.74)7
is closely related to the type Ce2(Ga0.1Ge0.9)7.
Both types are vacancy derivatives of the structure type SmNiGe3, which
is a linear intergrowth of layers characteristic of the structure types BaAl4,
AlB2, and α-Po. In the structure of Dy2Ga1.8Ge5.2
every second square antiprism in the BaAl4-type slabs is vacant and the Ga/Ge atoms centering the
remaining antiprisms are subjected to displacement disorder modeled
by a split site.
Intergrowth of AlB2-, α-
Keywords
Dysprosium / Gallium / Germanium / X-ray powder
diffraction /