Crystal structure of the Tl₄GeSe₄ ternary compound

Chem. Met. Alloys 2 (2009) 10-14

https://doi.org/10.30970/cma2.0079

O.S. GLUKH, M.Yu. SABOV, I.E. BARCHIJ, V.V. PAVLYUK, B. MARCINIAK

The crystal structure of the Tl₄GeSe₄ compound was determined by X-ray single crystal diffraction. The title compound crystallizes with the Tl₄SiSe₄ structure type (space group C2/c). The Tl⁺ cations are coordinated by four separate [GeSe₄]^4– anions, whereas the [GeSe₄]^4– anion is surrounded by nine Tl⁺ cations. Strengthening of the cation-anion interactions was observed with respect to the Si-compound.

a)

b)

c)

Crystal structure of Tl₄GeSe₄ projected on the xz plane. Packing of [GeSe₄] tetrahedron and Tl⁺ split nets (a), surrounding of the Tl⁺ ions by GeSe₄ tetrahedra (b), and surrounding of the GeSe₄ tetrahedra by Tl⁺ cations (c).

Keywords

Intermetallics / Crystal structure / X-ray diffraction / Thallium / Germanium / Selenium