SUBSOLIDUS PHASE RELATIONS IN ZNS-IN2S3 SYSTEM - 600 DEGREES C TO 1080 DEGREES 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 with a=3.85±0.01 Å. The c-dimension varies from 37.47 Å (39 ZnS:8 In2S3) to 18.63 Å (18 ZnS:8 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 ZnS:8 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, α=90° 16′, β=120° 02′ and γ=89° 47′. The structure of the other polytype and of compounds 17 ZnS:8 In2S3 and 10 ZnS:8 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. © 1969 Chapman and Hall.