Phase Diagram of KF—InF3 System

The phase diagram of the KF–InF3 system was investigated by DTA and XRD methods. In the system, two incongruent compounds, 2KF·InF3 and KInF4, were observed. The compound 2KF·InF3 was XRD-indexed as orthorhombic, where a=8.870±0.003, b=6.271±0.002, c=4.553±0.001 A. Another compound KInF4 polymorphously reacted at 784 °C. The room temperature phase was tetragonal, where a=7.160±0.004 and c=5.068±0.007 A. The structure of higher temperature phase has not been determined yet. An eutectic point was observed at 785 °C at 19.0 mol% InF3.