Subsolidus phase relations in the ZnS-In2S3 system: 600 to 1080° C

Eleven ternary compounds were synthesised, of which nine are new. The seven most ZnS-rich compounds form a series. Each has a primitive hexagonal lattice witha=3.85±0.01 Å. Thec-dimension varies from 37.47 Å (39 ZnS8 In₂S₃) to 18.63 Å (18 ZnS8 In₂S₃) with a periodicity of 3.14 Å which can be related to a decrease in the ZnS content. One of the four remaining compounds (12 ZnS8 In₂S₃) is triclinic, but at least two polytypes are present. The more common variety has the parameters:a=3.86 Å,b=15.48 Å,c=3.54 Å,=90° 16,=120° 02 and=89° 47. The structure of the other polytype and of compounds 17 ZnS:8 In₂S₃ and 10 ZnS8 In₂S₃ have not been determined. Stoichiometric ZnIn₂S₄ has a rhombic hexagonal lattice (a=3.86 Å,c=36.95 Å). This ternary compound which has been synthesised previously is the only one to show appreciable solid solution. Approximately 2 mole % ZnS is soluble in ZnIn₂S₄ at 600° C; this increases to 8 mole % at 1080° C.