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Erschienen in:
07.02.2017
The effects of Ta substitution on the microwave dielectric properties of Sr5Nb4TiO17 ceramics
Erschienen in: Journal of Materials Science: Materials in Electronics | Ausgabe 11/2017
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Abstract
Sr5Nb4 − xTaxTiO17 (0 ≤ x ≤ 4) ceramics were fabricated via solid state mixed oxide sintering rout. Single phase formation was observed for each composition within the in-house XRD detection limit in the entire range of compositions. All the investigated ceramics crystallized into an orthorhombic crystal structure with space group Pnnm. A highly dense microstructure comprised of alongated plate shaped grains was observed for each ceramics. Ta substitution for Nb improved the \({{Q}_{u}}{{f}_{o}}\) and τf values at the cost of slightly decrease in εr. Optimum microwave dielectric properties i.e. εr ~ 66, \({{Q}_{u}}{{f}_{o}}\) ~ 8500 GHz and τf ~ 180 ppm/°C was achieved for Sr5Ta4 TiO17 ceramics sintered at 1550 °C for 4 h respectively.