Crystal structure of d-Tm₂S₃

Chem. Met. Alloys 1 (2008) 38-42

https://doi.org/10.30970/cma1.0021

J. KOŃCZYK, P. DEMCHENKO, O. BODAK, G. DEMCHENKO, B. MARCINIAK, W. PROCHWICZ, L. MURATOVA

The crystal structure of the d-modification of thulium sesquisulfide, d-Tm₂S₃, has been determined by X-ray analysis of a single crystal (automatic diffractometer, 1425 unique reflections, R1 = 0.0425, wR2 = 0.0834). The compound crystallizes in the d-Ho₂S₃ structure type: space group P2₁/m, mP30, with lattice parameters a = 10.0626(14), b = 3.9675(5), c = 17.396(2) Å, b = 98.655(11)°. The coordination numbers of the Tm atoms are 6 (distorted octahedron) and 7 (mono-capped trigonal prism), whereas the S atoms have coordination numbers 4 and 5 (trigonal and tetragonal pyramids).

Stacking of distorted octahedrons [TmS₆] and mono-capped trigonal prisms [TmS₇] in d-Tm₂S₃.

Keywords

Rare-earth alloys and compounds / Crystal structure / X-ray diffraction