Abstract
Microwave dielectric ceramics in the Sr1− x Ba x Ca4Nb4TiO17 (0 ≤ x ≤ 0.75) composition series were fabricated via a solid-state mixed oxide route. All the compositions formed single phase in Sr1− x Ba x Ca4Nb4TiO17 (0 ≤ x ≤ 0.75) solid solutions within the detection limit of in-house X-ray diffraction (XRD). The sintered microstructure of these ceramics comprised densely packed elongated and plate-like grains. The dielectric properties varied linearly with x. Relative permittivity (ε r) increased from 47.2 to 54.5, unloaded quality factor multiplying the resonant frequency (Q u f o) decreased from 11,984 to 9345 GHz and temperature coefficient of resonant frequency (τ f) increased from −78.6 to 20 ppm/°C with an increase in x from 0 to 0.75. In the present study, ε r ≈ 51.6, Q u f o ≈ 10,160 GHz (5.37 GHz) and τ f ≈ −13.5 ppm/°C were achieved for Sr0.5Ba0.5Ca4Nb4TiO17 (x = 0.5) ceramics.
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Manan, A., Iqbal, Y. Improvement in the microwave dielectric properties of SrCa4Nb4TiO17 ceramics by Ba substitution. Bull Mater Sci 37, 1215–1219 (2014). https://doi.org/10.1007/s12034-014-0064-8
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DOI: https://doi.org/10.1007/s12034-014-0064-8