Crystal structure of R3Mg0.5DSe7
(R = Ce,
Pr; D = Si,
Ge)
Chem.
Met. Alloys 8 (2015) 16-21
https://doi.org/10.30970/cma8.0298
Oksana STROK, Marek DASZKIEWICZ, Lubomir GULAY
The crystal
structures of four quaternary R3Mg0.5DSe7 compounds (structure type La3Mn0.5SiS7,
space group P63, Pearson
code hP23,
a = 10.669(1) Å, c =
6.0611(8) Å,
R1 = 0.0252 for Ce3Mg0.5SiSe7;
a = 10.531(1) Å, c =
6.0420(1) Å,
R1 = 0.0275 for Pr3Mg0.5SiSe7;
a = 10.6579(7) Å, c = 6.0430(7) Å, R1 =
0.0249 for Ce3Mg0.5GeSe7; a = 10.615(1) Å, c =
6.0329(7) Å,
R1 = 0.0406 for Pr3Mg0.5GeSe7)
were determined by means of X-ray single-crystal diffraction. The R atoms occupy trigonal
prisms capped by two additional atoms. The Mg atoms are located in octahedra and the D
atoms in tetrahedra.
Packing of [CeSe11Se24Se33] bi-capped trigonal prisms, [ÌgSe26] octahedra and [SiSe11Se33] tetrahedra in the structure of Ce3Mg0.5SiSe7.
Keywords
Rare-earth
compounds / Chalcogenides / Crystal structure / X-ray
single-crystal diffraction