Crystal structure
of Y1.5La1.5Si1.75Se7
Chem.
Met. Alloys 10 (2017)
7-11
https://doi.org/10.30970/cma10.0338
Oleksandr SMITIUKH, Oleg MARCHUK, Ivan OLEKSEYUK, Anatoliy FEDORCHUK
The existence of the new quaternary
compound Y1.5La1.5Si1.75Se7 was
established, and its crystal structure was studied by X-ray powder diffraction:
space group P63, Pearson
code hP23.5, a = 10.5968(2) Å, c = 5.9995(2) Å, RI = 0.0414.
The coordination polyhedra of the rare-earth atoms (R = Y0.5La0.5)
are trigonal prisms with two additional atoms, those
of the Si atoms are octahedra
and tetrahedra.
Stacking of polyhedra of selenium atoms around the silicon atoms in the
structure of Y1.5La1.5Si1.75Se7.
Keywords
Rare-earth metals / Crystal
structure / X-ray powder diffraction