Abstract
We have studied phase equilibria in the pseudoternary system Ag2Se-As2Se3-Bi2Se3 and constructed the 300-, 600-, and 800-K isothermal sections, a number of partial phase diagrams, and the liquidus projection of this system. The AgAsSe2-AgBiSe2 and As2Se3-AgBiSe2 joins are shown to be pseudobinary, and the Ag3AsSe3-AgBiSe2 and AgAs3Se5-AgAsSe2 joins are pseudobinary below the liquidus. Several in- and univariant peritectic, eutectic, and eutectoid equilibria and a broad region of AgBiSe2-based solid solutions are identified. The homogeneity region of the AgBiSe2-based phase has the largest extent along the AgAsSe2-AgBiSe2 join: 40 mol % (650 K) for the high-temperature form of AgBiSe2 and 20 mol % (300 K) for its low-temperature form.
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