Crystal structures and microwave dielectric properties of (1-x) LaGaO₃-x SrTiO₃ (x=0.4, 0.5, 0.6) and 0.4SrTiO₃−0.6LaGaO₃-yCeO₂ (y=0, 0.05, 0.1, 0.2) ceramics were investigated. As the x values increased, the orthorhombic changed to tetragonal perovskite structure at x=0.6 in LaGaO₃-SrTiO₃ system ceramics. However, numerous secondary phases were detected in LaGaO₃-SrTiO₃ system ceramics. Surprisingly, CeO₂ additives could effectively suppress formation of secondary phases of 0.4SrTiO₃−0.6LaGaO₃ ceramics as Ce ions could be incorporated into host crystal lattices, leading to significantly improvement of optimal Q×f values from 35,354 GHz to 62,150 GHz. The Raman spectra exhibited that the modes associated with CeO₂ phase became more obvious with increasing CeO₂ additives. The 0.4SrTiO₃−0.6LaGaO₃−0.05CeO₂ ceramics, sintered at 1475 °C/4 h, exhibited superior microwave dielectric properties with ε_r=32.9, Q×f =62,150 GHz and τ_f=−26.6 ppm/°C.

（1- x）LaGaO ₃ - x SrTiO ₃（x = 0.4，0.5，0.6）和0.4SrTiO ₃ -0.6LaGaO ₃ - y CeO ₂（y = 0，0.05，0.1，0.2 ）的晶体结构和微波介电性能陶瓷进行了调查。随着x值的增加，LaGaO ₃ -SrTiO ₃系陶瓷中的正交晶在x = 0.6时变为四方钙钛矿结构。但是，在LaGaO ₃ - SrTiO ₃系陶瓷中检测到许多次生相。令人惊讶的是，CeO₂添加剂可以有效地抑制0.4SrTiO ₃ -0.6LaGaO ₃陶瓷第二相的形成，因为Ce离子可以掺入主体晶格中，从而导致最佳Q×f值从35,354 GHz显着提高到62,150 GHz。拉曼光谱显示，随着CeO ₂添加剂的增加，与CeO ₂相相关的模式变得更加明显。所述0.4SrTiO ₃ -0.6LaGaO ₃ -0.05CeO _2个陶瓷，在1475烧结℃/ 4小时，显示出优异的微波电介质特性与ε _{- [R} = 32.9，Q×˚F = 62150 GHz和τ _˚F = -26.6 PPM /℃ 。