Microstructure and microwave dielectric properties of Y(Nb1−xTax)O6 (x = 0.02−0.1) ceramics

Microstructure and microwave dielectric properties of the Y(Nb_1-xTa_x)TiO₆ (x = 0.02-0.01)ceramics were investigated. The microwave dielectric properties such as dielectric constants, Q×f value, and τ_f were studied as a function of composition and sintering temperature. The substitution of Ta promotes the microwave dielectric properties. Investigations were made on the structure and microstructure of the X-ray diffraction and scanning electron microscopy. The microwave dielectric properties of pure YNbTiO₆ ceramic showed εr ~ 17.9, Q×f ~ 51,600 GHz, and τ_f~ -53 ppm/°C are reported by Joseph et al. We found that a small amount of Ta substitution was effectively increased of the microwave dielectric properties, when x increasing to 0.05, Y(Nb_0.95Ta_0.05)TiO₆ possesses (εr ~ 22.03, Q×f ~ 103,600 GHz, and τ_f ~ -55.90 ppm/°C). The materials reported in this paper are excellent in terms of dielectric properties and cost of production compared to commercially available high quality dielectric resonators.