Interaction of the components in the Ag2SeSnSe2As2Se3 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 Ag2SeSnSe2As2Se3 system at 520 K was constructed using differential-thermal and X-ray phase analyses. The existence of a quaternary compound, Ag2SnAs6Se12 (space group Rm,= 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 SnSe2As2Se3 system (1 - L; 2 L+SnSe2; 3 L+As2Se3; 4 SnSe2+As2Se3).

 

Keywords

Semiconductors / Phase equilibria / Isothermal section / Crystal structure / X-ray powder diffraction