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<p>A method combining thermogravimetric analysis (TGA) and horizontal transpiration with elemental analysis via inductively coupled plasma mass spectrometry or ion chromatography enabled calculation of partial pressures of individual salts in molten mixtures. TGA quantified total mass loss, while transpiration identified vapor-phase composition. Two chloride (NaCl-MgCl<sub>2</sub>, NaCl-MgCl<sub>2</sub> + UCl<sub>3</sub>) salts and one mixed halide (LiCl-LiF + Li<sub>2</sub>O) salt were analyzed at 750&#xa0;°C and 550&#xa0;°C, respectively. NaCl and MgCl<sub>2</sub> vapor pressures were 2.19–2.61 × 10<sup>-4</sup>&#xa0;atm and 2.47–2.48 × 10<sup>-5</sup>&#xa0;atm (dependent upon the identity of the invesitgated mixture); UCl<sub>3</sub> was 1.42 × 10<sup>-7</sup> atm. LiCl and LiF vapor pressures at 550&#xa0;°C were 1.53 × 10<sup>-6</sup> and 6.32 × 10<sup>-6</sup> atm, respectively. Additionally, the TGA method was validated against values from the literature for unary LiCl and LiF.</p>

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Measurement of partial vapor pressures of salt mixtures via combined horizontal transpiration and thermogravimetric analysis

  • 期刊论文

  • 发表日期：

    2025年10月17日

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  • Jacob Yankey,
  • Mary Cernyar,
  • Cameron Leavitt,
  • Marisa Monreal,
  • Matt Jackson,
  • Justin Holland,
  • Richard Fitzhugh,
  • Michael Simpson

摘要

A method combining thermogravimetric analysis (TGA) and horizontal transpiration with elemental analysis via inductively coupled plasma mass spectrometry or ion chromatography enabled calculation of partial pressures of individual salts in molten mixtures. TGA quantified total mass loss, while transpiration identified vapor-phase composition. Two chloride (NaCl-MgCl2, NaCl-MgCl2 + UCl3) salts and one mixed halide (LiCl-LiF + Li2O) salt were analyzed at 750 °C and 550 °C, respectively. NaCl and MgCl2 vapor pressures were 2.19–2.61 × 10-4 atm and 2.47–2.48 × 10-5 atm (dependent upon the identity of the invesitgated mixture); UCl3 was 1.42 × 10-7 atm. LiCl and LiF vapor pressures at 550 °C were 1.53 × 10-6 and 6.32 × 10-6 atm, respectively. Additionally, the TGA method was validated against values from the literature for unary LiCl and LiF.