Sintering behavior and microwave dielectric properties of 0.67CaTiO3–0.33LaAlO3 ceramics modified by B2O3–Li2O–Al2O3 and CeO2

Abstract A low temperature sintering method was used to avoid the relatively high sintering temperatures typically required to prepare 0.67CaTiO 3 –0.33LaAlO 3 (CTLA) ceramics. Additionally, CeO 2 was introduced into the CTLA ceramics as an oxygen-storage material to improve their microwave dielectric properties. 0.67CaTiO 3 –0.33LaAlO 3 ceramics co-doped with B 2 O 3 –Li 2 O–Al 2 O 3 and CeO 2 were prepared by a conventional two-step solid-state reaction process. The sintering behavior, crystal structure, surface morphology, and microwave dielectric proprieties of the prepared ceramic samples were studied, and the reaction mechanism of CeO 2 was elucidated. CTLA+0.05 wt% BLA+3 wt% CeO 2 ceramics sintered at 1360 °C for 4 h exhibited the optimal microwave dielectric properties: dielectric constant ( e r )=45.02, quality factor ( Q×f )=43102 GHz, and temperature coefficient of resonant frequency ( τ f )=2.1 ppm/°C. The successful preparation of high-performance microwave dielectric ceramics provides a direction for the future development and commercialization of CTLA ceramics.