The Tl2Se–HgSe–GeSe2 system and the crystal structure of
Tl2HgGeSe4
Chem.
Met. Alloys 6
(2013) 55-62
https://doi.org/10.30970/cma6.0229
M.Yu. MOZOLYUK, L.V. PISKACH, A.O. FEDORCHUK, I.D. OLEKSEYUK, O.V. PARASYUK
The phase equilibria
in the quasi-ternary system Tl2Se–HgSe–GeSe2
were investigated by differential-thermal analysis and X-ray diffraction. Phase
diagrams of the Tl2Se–HgSe and Tl2GeSe3–HgSe systems were constructed, as well as the isothermal
section of the Tl2Se–HgSe–GeSe2
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 /