Phase relations of ternary compounds in the BaFeS system

The phase relations of the ternary phases at 900 and 700°C were determined by heating mixtures in the regions BaSFeSFeS₂ and FeFeSBaS and identifying the products by powder X-ray diffraction. The stable ternary phases at 900°C are BaFe₂S₃, Ba₂FeS₃, Ba₆Fe₈S₁₅, a solid solution BaFeS₂Ba₇Fe₆S₁₄, Ba₂FeS₄, the infinitely adaptive series $\text{Ba}{}_3\text{Fe}{}_{\mathrm{1+x}}\text{S}{}_5\text{,}\text{1}\text{3}\text{≤ x ≤}\text{2}\text{5}$, and Ba₉Fe₁₆S₃₂ which belongs to the infinitely adaptive series Ba_1+xFe₂S₄. At 700°C the stable ternary phases are: BaFe₂S₃, Ba₂FeS₃, BaFeS₂Ba₇Fe₆S₁₄ (solid solution), Ba₆Fe₈S₁₅, Ba₂FeS₄, Ba₅Fe₄S₁₁, and two infinitely adaptive series: Ba₃Fe_1+xS₅ and Ba_1+xFe₂S₄. A stable ternary phase at 700 and 900°C with probable composition Ba₂Fe₄S₅ was found in the FeFeSBaS section.