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Phase diagrams of the KF-K2TaF7 and KF-Ta2O5 systems

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Abstract

The phase diagrams of the systems KF-K2TaF7 and KF-Ta2O5 were determined using the thermal analysis method. The phase diagrams were described by suitable thermodynamic model. In the system KF-K2TaF7 eutectic points at x KF=0.716 and t=725.4°C and at x KF=0.214 and t=712.2°C has been calculated. It was suggested that K2TaF7 melts incongruently at around 743°C forming two immiscible liquids. The system KF-Ta2O5 have been measured up to 8 mol% of Ta2O5. The eutectic point was estimated to be at x KF∼0.9 and t∼816°C. The formation of KTaO3 and K3TaO2F4 compounds has been observed in the solidified samples.

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Authors and Affiliations

  1. Institute of Inorganic Chemistry, Slovak Academy of Sciences, Dúbravská cesta 9, 845 36, Bratislava, Slovakia

    M. Boča, Z. Ivanová, E. Mikšíková & B. Kubíková

  2. Department of Inorganic Technology, Faculty of Chemical and Food Technology, Slovak University of Technology, Radlinského 9, 812 37, Bratislava, Slovakia

    V. Danielik

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  1. M. Boča
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  2. V. Danielik
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  3. Z. Ivanová
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  4. E. Mikšíková
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  5. B. Kubíková
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Correspondence to M. Boča.

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Boča, M., Danielik, V., Ivanová, Z. et al. Phase diagrams of the KF-K2TaF7 and KF-Ta2O5 systems. J Therm Anal Calorim 90, 159–165 (2007). https://doi.org/10.1007/s10973-006-7700-5

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  • DOI: https://doi.org/10.1007/s10973-006-7700-5

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