Sintering behaviour and microwave dielectric properties of MgO/Eu2O3-doped 0.65CaTiO3–0.35SmAlO3 ceramics

• Published in: Journal of materials science. Materials in electronics 2019-05, Vol.30 (10), p.9372-9378
• Main Authors: Chang, Yi, Zhang, Liming, Xin, Miao, Luo, Xianfu, Ren, Luchao, Zhou, Hongqing
• Format: Article
• Language: English
• Subjects: Additives; Ceramics; Characterization and Evaluation of Materials; Chemistry and Materials Science; Dielectric properties; Europium compounds; Magnesium oxide; Materials Science; Optical and Electronic Materials; Perovskites; Qualitative analysis; Sintering; Tricalcium aluminate
• ISSN: 0957-4522; 1573-482X
• DOI: 10.1007/s10854-019-01267-3

0.65CaTiO 3 –0.35SmAlO 3 ceramics (CTSA) were synthesized by the conventional solid-state method. To illustrate the effect of MgO/Eu 2 O 3 additives and sintering temperatures on the dielectric properties of the CTSA ceramics, we performed qualitative and quantitative analyses. XRD analysis revealed that the perovskite phase was the main phase and a second phase Ca 3 Al 2 O 6 appeared with steadily increasing Eu 2 O 3 content in CTSA ceramics. The appropriate ratio of MgO/Eu 2 O 3 additives resulted in a dense microstructure and excellent microwave dielectric properties, and lowered the sintering temperature from 1500 to 1315 °C. Excellent microwave dielectric properties of ε r  = 45.32, Q ×  f  = 43,600 GHz (at 5.0 GHz), and τ f = − 1.1 ppm/°C were attained for 0.65CaTiO 3 –0.35SmAlO 3 ceramics with 0.5 wt% MgO and 0.2 wt% Eu 2 O 3 additives sintered at 1315 °C for 4 h.