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The phase diagram of the quasi-binary Ag 2Se–As2Se3 system was constructed using differential-thermal and X-ray phase analyses. The crystal structure of the ternary AgAs3Se5 compound (space group Rm, a = 0.38195(1) nm, c = 5.0082(2) nm, RI = 0.0868) was investigated using X-ray powder diff raction. The Se atoms form a close-packed arrangement with the laye rs 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.

Phase diagram of the Ag2Se–As2Se3 system and crystal structure of the AgAs3Se5 compound