Materials with layered structures X: subsolidus phase diagram of the system FeIn2S4–FeIn2Se4

1998 
Abstract The system (1− x )FeIn 2 S 4 – x FeIn 2 Se 4 has been investigated by X-ray powder methods. The subsolidus phase diagram is constructed in the temperature interval 600–1000°C. The spinel type FeIn 2 S 4 exhibits a phase width up to the composition FeIn 2 S 3 Se and the layered FeIn 2 Se 4 is formed for 1≥ x ≥0.65. A new layered compound is formed for 0.55≥ x ≥0.4 which crystallizes at temperatures below 850°C in an α-FeGa 2 S 4 structure with a =363.6 pm and c =1207.1 pm ( x =0.5) for the hexagonal cell and at higher temperatures in the MgAl 2 S 4 -type with a =393.9 pm and c =3843.2 pm ( x =0.5) for the hexagonal cell. Both structures have been refined by the Rietveld-method. All phase boundaries are nearly independent from temperature.
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