A eutectic mixture of lithium, sodium, and potassium fluorides is considered as a fuel salt for molten-salt reactors. For this reason, information about the solubility in it of fluorides of fissile materials and fission products is the most important when choosing a salt composition for a molten-salt reactor. In this work, the liquidus and solidus temperatures of the LiF–NaF–KF–CeF₃ quasi-binary system are determined by thermal analysis and differential scanning calorimetry. The system has one eutectic point at CeF₃ content 3 mol.% and temperature 445°C and three peritectic points – 7.5, 15, and 20.5 mol.% at 472, 512, and 600°C, respectively. The solubility of CeF₃ in LiF–NaF–KF is 10 mol.% at 500°C and reaches 25 mol.% at 665°С.

氟化锂、氟化钠和氟化钾的共晶混合物被认为是熔盐反应堆的燃料盐。因此，在为熔盐反应堆选择盐成分时，关于裂变材料和裂变产物的氟化物在其中溶解度的信息是最重要的。在这项工作中，LiF-NaF-KF-CeF ₃准二元体系的液相线和固相线温度通过热分析和差示扫描量热法确定。_{该系统在 CeF 3}含量为 3 mol.% 和温度 445°C时具有一个共晶点，在 472、512和 600°C 时具有三个包晶点——分别为 7.5、15 和 20.5 mol.%。CeF ₃在 LiF–NaF–KF 中的溶解度在 500°C 时为 10 mol.%，在 665°С 时达到 25 mol.%。