Abstract
Ca 1.15 RE 0.85 Al 0.85 Ti 0.15 O 4 (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 Ca 1.15 Nd 0.85 Al 0.85 Ti 0.15 O 4 (CNAT) and Ca 1.15 Y 0.85 Al 0.85 Ti 0.15 O 4 (CYAT) ceramics are single-phase structures, and the Ca 1.15 La 0.85 Al 0.85 Ti 0.15 O 4 (CLAT) ceramic contain LaAlO 3 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 ε r = 19.2, Q × f = 74924 GHz, τ f = −1.21 ppm/°C and ε r = 17.5, Q × f = 27440 GHz, τ f = −5.79 ppm/°C, respectively. And the best microwave dielectric properties of ε r = 17.5, Q × f = 22568 GHz, τ f = −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 Ca 1.15 RE 0.85 Al 0.85 Ti 0.15 O 4 (RE = Nd, La, Y) ceramics, which has promising potential for application.
Published Version
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