Hexagonal La₂O₃ and monoclinic Eu₂O₃ ceramics were prepared, and their microwave dielectric properties were investigated. La₂O₃ sintered at 1400 °C exhibited promising microwave dielectric properties of ε_r = 18.6, Q×f = 71,400 GHz, and a negative τ_f of − 35.1 ppm/°C, while Eu₂O₃ sintered at 1500 °C possessed relative lower ε_r and Q×f values of 17.9 and 35,000 GHz, respectively, with an abnormally positive τ_f of + 19.6 ppm/°C. The difference in their microwave dielectric properties is mainly due to lattice-induced strain, which can be characterized by bond valence. To investigate the degradation of RE₂O₃ (RE = La, Eu) ceramics in air, a series of La_2−xEu_xO₃ (x = 0.5, 1, and 1.5) ceramics were prepared. The results of the present study suggest that the introduction of Eu³⁺ effectively prevents the decomposition of La₂O₃.

制备了六方La ₂ O ₃和单斜Eu ₂ O _{3陶瓷，并研究了它们的微波介电性能。}在 1400 °C 下烧结的La ₂ O _{3表现出良好的微波介电特性：} ε _r = 18.6，Q × f = 71,400 GHz，负τ _f为 − 35.1 ppm/°C，而 Eu ₂ O ₃在 1500 °C 下烧结具有相对较低的ε _r和Q × f值，分别为 17.9 和 35,000 GHz，异常正τ _f为 + 19.6 ppm/°C。它们微波介电特性的差异主要是由于晶格诱导应变，可以用键价来表征。为了研究RE ₂ O ₃ ( RE = La, Eu) 陶瓷在空气中的降解，制备了一系列 La _{2− x} Eu _x O ₃ ( x  = 0.5、1 和 1.5) 陶瓷。本研究的结果表明，Eu ^{3+的引入有效地阻止了La} ₂ O ₃的分解。