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Thermodynamic and transport properties of the HoBr3–KBr pseudo-binary system

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Abstract

Phase diagram of HoBr3–KBr pseudo-binary system was established by differential scanning calorimetry (DSC) method. This system includes two intermediate compounds: K3HoBr6 and K2HoBr5. K3HoBr6 undergoes a solid–solid phase transition at 689 K and melts congruently at 992 K, while K2HoBr5 melts incongruently at 736 K. In the HoBr3–KBr, system two eutectics occur. The eutectic mixture e1 melts at 875 K; its composition is x(HoBr3) = 0.162. The other eutectic e2 with composition of x(HoBr3) = 0.455 melts at 699 K. The heat capacity (solid and liquid phase) of congruently melting compound formed in this system was measured by DSC in the 300–1273 K range. The specific conductivity of HoBr3–KBr liquid mixtures was measured down to temperatures below solidification over the entire composition range. The obtained results are discussed in term of possible complexes formation.

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Acknowledgements

The work was co-financed by statutory activity subsidy from the Polish Ministry of Science and Higher Education for the Faculty of Engineering and Economics of Wrocław University of Economics and for the Faculty of Chemistry of Wroclaw University of Technology.

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Authors and Affiliations

  1. Department of Inorganic Chemistry, Faculty of Engineering and Economics, Wrocław University of Economics, Komandorska 118/120, 53-345, Wrocław, Poland

    Bożena Pilarek & Irena Szczygieł

  2. Division of Analytical Chemistry and Chemical Metallurgy, Faculty of Chemistry, Wrocław University of Technology, Wybrzeże Wyspiańskiego 27, 50-370, Wrocław, Poland

    Leszek Rycerz

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Correspondence to Bożena Pilarek.

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Pilarek, B., Rycerz, L. & Szczygieł, I. Thermodynamic and transport properties of the HoBr3–KBr pseudo-binary system. J Therm Anal Calorim 125, 1125–1133 (2016). https://doi.org/10.1007/s10973-016-5496-5

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