Crystal structure, Raman spectra analysis and microwave dielectric properties optimization of (Ca0.22Li0.39Sm0.39)TiO3 ceramics doped with SmAlO3

(Ca0.22Li0.39Sm0.39)TiO3 + x mol SmAlO3 (0, 0.02, 0.04, 0.06, 0.08, 0.1) (CLST + xSA) ceramics were synthesized by a solid-state reaction method. CLST + xSA solid solution ceramics with an orthorhombic perovskite structure (pnma (62) (42-0423)) were obtained and verified by X-ray diffraction (XRD). Structural refinement and Raman spectra were used to investigate the effect of SmAlO3 doping on the microstructure and lattice vibration of CLST ceramics. The Q x f value showed a significant increase from 4754.9 to 6207.5 GHz with increasing SA doping content. The permittivity e r decreased from 109 to 87.4, and the temperature coefficient of resonant frequency tau(f) decreased from 7.38 to -20.76 ppm degrees C-1. The optimal microwave dielectric properties of epsilon(r) = 98.7, Q x f= 5667.7 GHz and tau(f) = -1.5 ppm degrees C-1 were obtained in CLST + xSA (x = 0.04) ceramics sintered at 1260 degrees C. (C) 2019 Elsevier B.V. All rights reserved.