Abstract
(1-x)BaWO4-xTiO2 (x = 0.00, 0.05, 0.10, 0.15, 0.20, 0.25, BWT) ceramics were prepared by traditional solid-state method. The XRD patterns indicate that the BWT ceramics exist as composites, and the Raman spectra show that as TiO2 increases, the vext mode shifts to a low wavenumber and the Ba–O bond length decreases. The variations in FWHM values of the v3(Eg) modes and c/a values indicate the changes in the ordered structures that lead to the increase in dielectric loss. The infrared spectra were fitted by the FPSQ model, and the external mode (Eu) contributes most to the dielectric properties, which is related to the Ba–O bond vibration. With the increase in x values, the τf values increase from − 101.61 to − 6.71 ppm/°C, the er values increase from 8.03 to 9.49, and the 0.75BaWO4–0.25TiO2 ceramic with stable temperature coefficient was obtained: er = 9.49, Q × f = 20,602 GHz (f = 17.99 GHz), τf = − 6.71 ppm/°C.
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