Microwave dielectric properties of Ca1.15RE0.85Al0.85Ti0.15O4 (RE=Nd, La, Y) ceramics prepared by the reaction sintering method

摘要

? 2022 Elsevier Ltd and Techna Group S.r.l.Ca1.15RE0.85Al0.85Ti0.15O4 (RE = Nd, La, Y) ceramics were prepared by a reaction sintering method. The sintering behavior, phase composition, microstructure and microwave dielectric performances of ceramics were investigated. X-ray diffraction patterns illustrated that both the Ca1.15Nd0.85Al0.85Ti0.15O4(CNAT) and Ca1.15Y0.85Al0.85Ti0.15O4(CYAT) ceramics are single-phase structures, and the Ca1.15La0.85Al0.85Ti0.15O4(CLAT) ceramic contain LaAlO3 and CaO phases. The apparent morphology and elemental distribution of the ceramic samples were analyzed by using scanning electron microscope and energy dispersive spectrometer. When the sintering temperature is 1500 °C, the CNAT and CYAT ceramics have the best microwave dielectric properties with εr = 19.2, Q × f = 74924 GHz, τf = ?1.21 ppm/°C and εr = 17.5, Q × f = 27440 GHz, τf = ?5.79 ppm/°C, respectively. And the best microwave dielectric properties of εr = 17.5, Q × f = 22568 GHz, τf = ?14.69 ppm/°C were obtained for the CLAT ceramic sintered at 1525 °C. The reaction sintering method provides a low-cost, economical and straightforward method for the preparation of the Ca1.15RE0.85Al0.85Ti0.15O4 (RE = Nd, La, Y) ceramics, which has promising potential for application.