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Considering the inconsistency of the available literature data on phase equilibria in the SnSe -Sb 2 Se 3 system, the issue was re-examined by differential thermal analysis and X-ray diffraction technique. A new, refined version of the phase diagram was constructed. It was found that the ternary compound Sn 2 Sb 2 Se 5 and the intermediate  -phase with a homogeneity region of 48-60 mol% Sb 2 Se 3 are formed in the system, which melting with decomposition by peritectic reactions at 598°С (Sn 2 Sb 2 Se 5 ) and 560°С (γ-phase). This area includes stoichiometric compositions of ternary compounds SnSb 2 Se 4 and Sn 2 Sb 6 Se 11 . A comparative analysis of the results obtained with literature data was carried out.

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