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Phase equilibria in the SmCl3–TlCl pseudobinary system

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Abstract

The phase equilibria in the samarium(III) chloride–thallium chloride pseudobinary system were established by means of differential scanning calorimetry (DSC). The DSC investigations were performed on samples with different compositions in whole mole fraction x(SmCl3) range. Experiments were carried out at heating and cooling rates ranging from 1 to 5 K min−1. This system has an eutectic character and includes three intermediate compounds: congruently melting Tl2SmCl5 (T melt = 790 K) and incongruently melting Tl3SmCl6 (T dec = 754 K) and TlSm2Cl7 (T dec = 774 K). The dependence of heat capacity of Tl2SmCl5 on temperature has been measured for temperature range 300–900 K. The SmCl3–TlCl pseudobinary system was optimized by CALPHAD method using the available experimental data. The dependencies of mixing enthalpy and mixing entropy on mole fraction x(SmCl3) were estimated. The dependencies of formation Gibbs energy on temperature and temperature range of existence of all solid compounds have been calculated and discussed.

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Acknowledgements

The work was co-financed by a 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. We would like to thank Dr. Hans Leo Lukas from Max-Planck-Institut für Metallforschung, Stuttgart, Germany, for his set of programs for optimization and calculation of the phase diagrams.

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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

    Beata Salamon & Irena Szczygieł

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

    Jan Kapała & Leszek Rycerz

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  1. Beata Salamon
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Correspondence to Beata Salamon.

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Salamon, B., Kapała, J., Rycerz, L. et al. Phase equilibria in the SmCl3–TlCl pseudobinary system. J Therm Anal Calorim 126, 807–814 (2016). https://doi.org/10.1007/s10973-016-5470-2

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