Crystal structure of Y_1.5La_1.5Si_1.75Se₇

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 Y_1.5La_1.5Si_1.75Se₇ 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, R_I = 0.0414. The coordination polyhedra of the rare-earth atoms (R = Y_0.5La_0.5) 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 Y_1.5La_1.5Si_1.75Se₇.

Keywords

Rare-earth metals / Crystal structure / X-ray powder diffraction