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Phase analysis and density of the system K2ZrF6–K2TaF7

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Abstract

Thermal analysis and the Archimedean method were used to determine the phase equilibrium and density of the pseudo-binary system K2ZrF6–K2TaF7. Molar volume and excess molar volume were calculated on the basis of the experimental density data. Concentration dependencies of molar volume and molar excess volume for selected temperatures (1,133, 1,153, and 1,173 K) revealed minima at the composition \(x_{{{\text{K}}_{ 2} {\text{ZrF}}_{ 6} }} = 0.20\). A “compressibility parameter” for K2TaF7 was introduced for discussion of volume changes of the system; volume contractions were observed.

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Acknowledgments

This work was supported by the Slovak Research and Development Agency under contract APVV-0460-10. This work was financially supported by the Scientific Grant Agency of the Ministry of Education of the Slovak Republic and the Slovak Academy of Sciences, Nos 2/0095/12 and 2/0179/10. This work is the result of the project Competence Center for New Materials, Advanced Technologies, and Energy, ITMS 26240220073, supported by the Research and Development Operational Program funded by the European Regional Development Fund.

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Authors and Affiliations

  1. Institute of Inorganic Chemistry, Slovak Academy of Sciences, Bratislava, Slovakia

    Blanka Kubíková, Jarmila Mlynáriková, Zuzana Vasková, Petra Jeřábková & Miroslav Boča

  2. Department of Chemistry, Faculty of Natural Sciences, Constantine The Philosopher University, Nitra, Slovakia

    Miroslav Boča

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  1. Blanka Kubíková
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  2. Jarmila Mlynáriková
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  3. Zuzana Vasková
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  4. Petra Jeřábková
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  5. Miroslav Boča
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Correspondence to Blanka Kubíková.

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Kubíková, B., Mlynáriková, J., Vasková, Z. et al. Phase analysis and density of the system K2ZrF6–K2TaF7 . Monatsh Chem 145, 1247–1252 (2014). https://doi.org/10.1007/s00706-014-1214-9

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  • DOI: https://doi.org/10.1007/s00706-014-1214-9

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