The Tl2SeHgSeGeSe2 system and the crystal structure of Tl2HgGeSe4

 

Chem. Met. Alloys 6 (2013) 55-62

 

M.Yu. MOZOLYUK, L.V. PISKACH, A.O. FEDORCHUK, I.D. OLEKSEYUK, O.V. PARASYUK

 

The phase equilibria in the quasi-ternary system Tl2SeHgSeGeSe2 were investigated by differential-thermal analysis and X-ray diffraction. Phase diagrams of the Tl2SeHgSe and Tl2GeSe3HgSe systems were constructed, as well as the isothermal section of the Tl2SeHgSeGeSe2 system at 520 K. Two intermediate quaternary compounds, Tl2HgGeSe4 and Tl2HgGe2Se6, exist at this temperature. Tl2HgGeSe4 crystallizes in the non-centrosymmetric space group I-42m with the unit cell parameters a = 0.79947(4) nm, c = 0.67617(4) nm.

 

 

Location of metal atoms within the cubic anionic sub-lattice formed by germanium-centered tetrahedra of selenium atoms in the Tl2HgGeSe4 structure

 

Keywords

Chalcogenides / Semiconductors / X-ray diffraction / Crystal structure