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<p><b>Abstract</b>—The LiCl–LiBr–Li<sub>2</sub>SO<sub>4</sub> system was studied by differential thermal analysis (DTA) and differential scanning calorimetry (DSC). Phase assemblage analysis showed that system’s liquidus surface consists of L-i<sub>2</sub>SO<sub>4</sub> and LiCl<sub><i>x</i></sub>Br<sub>1 –</sub> <sub><i>x</i></sub> continuous solid solutions (CSS) crystallization fields. The composition of the minimum point M 457 in equivalent percent (equiv %) was determined as LiCl, 18; LiBr, 42; Li<sub>2</sub>SO<sub>4</sub>, 40. The crystallization temperature is 457°C, and the specific enthalpy of phase transition is 248.1 ± 7.5 J/g. A 3D model of the system was designed, and a disassemblable model of the phase crystallization volumes was designed in order to identify phase reactions occurring in the LiCl–LiBr–Li<sub>2</sub>SO<sub>4</sub> system. A mass balance diagram of the coexisting equilibrium phases was designed for an arbitrarily selected figurative point of the system to demonstrate the power of the 3D model. The melting temperatures and eutectic compositions of lower-dimension boundary elements and polythermal sections of the LiCl–LiBr–Li<sub>2</sub>SO<sub>4</sub> three–component system used to design the model in the COMPAS-3D program were experimentally studied in the work.</p>

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Thermal Analysis of the LiCl–LiBr–Li2SO4 System

  • 期刊论文

  • 发表日期：

    2025年6月1日

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  • N. N. Verdiev,
  • M. M. Magomedov,
  • A. V. Burchakov,
  • I. M. Kondratyuk,
  • Z. N. Verdieva,
  • L. S. Muradova

摘要

Abstract—The LiCl–LiBr–Li2SO4 system was studied by differential thermal analysis (DTA) and differential scanning calorimetry (DSC). Phase assemblage analysis showed that system’s liquidus surface consists of L-i2SO4 and LiClxBr1 – x continuous solid solutions (CSS) crystallization fields. The composition of the minimum point M 457 in equivalent percent (equiv %) was determined as LiCl, 18; LiBr, 42; Li2SO4, 40. The crystallization temperature is 457°C, and the specific enthalpy of phase transition is 248.1 ± 7.5 J/g. A 3D model of the system was designed, and a disassemblable model of the phase crystallization volumes was designed in order to identify phase reactions occurring in the LiCl–LiBr–Li2SO4 system. A mass balance diagram of the coexisting equilibrium phases was designed for an arbitrarily selected figurative point of the system to demonstrate the power of the 3D model. The melting temperatures and eutectic compositions of lower-dimension boundary elements and polythermal sections of the LiCl–LiBr–Li2SO4 three–component system used to design the model in the COMPAS-3D program were experimentally studied in the work.