Phase diagram of the Ag2Se
– As2Se3 system and crystal structure of the AgAs3Se5
compound
Chem.
Met. Alloys 1
(2008) 288-292
https://doi.org/10.30970/cma1.0067
O.S. KLYMOVYCH, O.F. ZMIY, L.D. GULAY, T.A. OSTAPYUK
The phase diagram of the quasi-binary Ag2Se–As2Se3 system was constructed using
differential-thermal and X-ray phase analyses. The crystal structure of the ternary
AgAs3Se5 compound (space group R-3m, a = 0.38195(1)
nm, c = 5.0082(2) nm, RI = 0.0868) was investigated using X-ray powder
diffraction. The Se
atoms form a
close-packed arrangement
with the layers stacked in the sequence ABC. The atoms of a statistical mixture M (0.5Ag+0.5As) and the remaining As atoms occupy 4/5 of the octahedral interstices.
Stacking of M-, Ag- and As-centered octahedra in the
structures of the AsAsSe2,
Ag2SnAs6Se12 and AgAs3Se5 compounds.
Keywords
Semiconductors / Phase diagram /