鉴于RE_2SiO_5、RE_(4.67)Si_3O_(13)(RE=La、Ce)等稀土硅酸盐热力学数据的缺失,通过比较分析后采用较准确的Carvalho经验式、Binnewies熵值相加法、Neumann-Kopp定律、Kubaschewski法计算得到了稀土硅酸盐的标准生成焓、标准熵、C_p(298.15 K)、C_p(T)等热力学数据,对稀土硅酸盐的热力学数据进行了补充和完善。采用Redlich-Kister表达式得到了较为准确的La_2O_3-SiO_2相图,在此基础上首次对Ce_2O_3-SiO_2体系的相图进行了预测。 In view of the lack of thermodynamic data of rare earth silicates such as RE_2SiO_5 and RE_ (4.67) Si_3O_ (13) (RE = La, Ce), the comparatively accurate Carvalho empirical formula, Binnewies entropy addition method, Neumann-Kopp The thermodynamics data of rare earth silicates, such as standard enthalpy of formation, standard entropy, C_p (298.15 K) and C_p (T), were calculated by Kubaschewski’s law. The thermodynamic data of rare earth silicate were supplemented and improved. A more accurate La_2O_3-SiO_2 phase diagram was obtained by using the Redlich-Kister expression. Based on this, the phase diagram of Ce_2O_3-SiO_2 system was predicted for the first time.