Phase equilibria in the Tl₂S–HgS–SnS₂ system at 520 K and crystal structure of Tl₂HgSnS₄

Chem. Met. Alloys 10 (2017) 136-141

https://doi.org/10.30970/cma10.0368

Lyudmyla Piskach, Mariya Mozolyuk, Anatoliy Fedorchuk, Ivan Olekseyuk, Oleg Parasyuk

The phase equilibria in the quasi-ternary system Tl₂S–HgS–SnS₂ at 520 K were investigated by X-ray diffraction. The isothermal section of the system at 520 K was constructed. One quaternary compound, Tl₂HgSnS₄, was found at this temperature. Tl₂HgSnS₄ crystallizes in a tetragonal structure, non-centrosymmetric space group I-42m, unit cell parameters a = 7.8571(6) Å, c = 6.6989(7) Å, V = 413.5(1) Å³.

Projection of the unit cell of Tl₂HgSnS₄ onto the xy plane and the coordination polyhedra of the atoms.

Keywords

Thallium chalcogenides / Crystal structure / Phase diagram / Isothermal section / X‑ray diffraction