Abstract
Ba1−xCax(Mg1/3Nb2/3)O3 (0 ≤ x ≤ 0.02) perovskite ceramics were prepared by the solid-state reaction method. The phase composition and microstructure were characterized by XRD and SEM, respectively. The result showed that all ceramics exhibited the 1:2 ordered perovskite structure, and the grain size decreased first and then increased with different substitution amount of Ca2+ for Ba2+. The dielectric properties were examined by Vector network analyzer, and the Raman spectra was used to interpret the dielectric properties of Ba1−xCax(Mg1/3Nb2/3)O3 ceramics. The dielectric constant (er) were strongly depended on the Raman shift of A1g(O) stretch mode, and the quality factor (Q × f) manifested great correlated with the full width at half maxima (FWHM) of A1g(O) stretch mode. The Ba1−xCax(Mg1/3Nb2/3)O3 ceramics substituted of Ca2+ for Ba2+ in x = 0.005, which possessed the narrowest FWHM and the highest degree of 1:2 ordering, showed the best microwave dielectric properties: er = 31.64, Q × f = 74421 GHz, τf = 14.59 ppm/°C.
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