Differential scanning calorimetry technique was used to investigate phase equilibria in the YbCl₂–MCl (M = Li, Na) binary systems. The YbCl₂–LiCl system exhibits an eutectic located at YbCl₂ mole fraction x = 0.415 (733 K) and a LiYb₂Cl₅ stoichiometric compound that is formed at 711 K and melts incongruently at 742 K. The YbCl₂–NaCl system exhibits an eutectic located at YbCl₂ mole fraction x = 0.559 (764 K). In both systems the formation of solid solutions in the MCl-rich side (M = Li, Na) has been found. The molar enthalpies of mixing (ΔH^MIX) in the liquid YbCl₂–MCl (M = Na, K) mixtures have been measured at 1085 K with a Calvet-type high temperature microcalorimeter in the entire range of composition. A negative value of mixing enthalpy was observed for all melts. The minimum value was of approximately: − 2.5, and − 7.5 kJ mol⁻¹, for systems with NaCl and KCl, respectively. All the experimental results along with the available literature data were used to optimize the thermodynamic properties of the investigated systems using the CALPHAD method.

_{差示扫描量热技术用于研究 YbCl 2} -MCl（M = Li，Na）二元系统中的相平衡。YbCl ₂ –LiCl 系统表现出共晶位于 YbCl ₂摩尔分数x  = 0.415 (733 K) 和 LiYb ₂ Cl ₅化学计量化合物在 711 K 形成并在 742 K 不一致地熔化。YbCl ₂ –NaCl系统表现出位于 YbCl ₂摩尔分数x  = 0.559 (764 K) 处的共晶。在这两个系统中，已发现在富含 MCl 的一侧（M = Li、Na）形成固溶体。液体 YbCl 中的摩尔混合焓 (Δ H ^{MIX )}已使用 Calvet 型高温微量热计在 1085 K 下测量了_{2 –MCl（M = Na, K）混合物的整个组成范围。}对于所有熔体，观察到混合焓的负值。对于具有 NaCl 和 KCl 的系统，最小值约为：- 2.5 和 - 7.5 kJ mol ^{-1 。}所有实验结果以及可用的文献数据都用于使用 CALPHAD 方法优化所研究系统的热力学性质。