Interaction of the components in the Ag2Se–SnSe2–As2Se3 system
Chem. Met. Alloys 1 (2008) 115-119
O.F. ZMIY, L.D. GULAY, T.A. OSTAPYUK, O.S. KLYMOVYCH
The isothermal section of the quasi-ternary Ag2Se–SnSe2–As2Se3 system at 520 K was constructed using differential-thermal and X-ray phase analyses. The existence of a quaternary compound, Ag2SnAs6Se12 (space group Rm, a = 0.38118(1) nm, c = 3.9724(3) nm) with incongruent type of melting at 690 K, was established. The Se atoms in the structure of the Ag2SnAs6Se12 compound are stacked in a close-packed arrangement with the layers in the sequence ABC. A statistical mixture of cations (0.333Ag+0.167Sn+0.500As) occupy one half of the octahedral interstices. The remaining As atoms are distributed over the other octahedral interstices.
Phase diagram of the SnSe2–As2Se3 system (1 - L; 2 – L+SnSe2; 3 – L+As2Se3; 4 – SnSe2+As2Se3).
/ Phase equilibria / Isothermal section /