Low Temperature Sintering and Dielectric Properties of BiNbO4and ZnNb2O6Ceramics with Zinc Borosilicate Glass

Abstract

Low temperature sintering behavior and microwave dielectric properties of the <TEX>$BiNbO_{4^-}$</TEX> and the <TEX>$ZnNb_2O_{6^-}zinc$</TEX> borosilicate glass(ZBS) systems were investigated with a view to applying the composition to LTCC technology. The addition of <TEX>$10{\sim}30$</TEX> wt% ZBS in both systems ensured successful sintering below <TEX>$900^{\circ}C$</TEX>. For the <TEX>$BiNbO_{4^-}ZBS$</TEX> system, the sintering was completed when 15 wt% ZBS was added whereas 25 wt% ZBS was necessary for the <TEX>$ZnNb_2O_{6^-}zinc$</TEX> system. Secondary phase was not observed in the <TEX>$BiNbO_{4^-}ZBS$</TEX> system but a small amount of <TEX>$ZnNb_2O_6$</TEX> with the willemite structure as the secondary phase was observed in the <TEX>$ZnNb_2O_{6^-}ZBS$</TEX> system. In terms of dielectric properties, the application of the <TEX>$BiNbO_{4^-}$</TEX> and the <TEX>$ZnNb_2O_{6^-}ZBS$</TEX> systems sintered at <TEX>$900^{\circ}C$</TEX> to LTCC were shown to be appropriate; <TEX>$BiNbO_{4^-}15$</TEX> wt% ZBS(<TEX>$\varepsilon_r=25,\;Q{\times}f\;value=3,700GHz,\;\tau_f=-32ppm/^{\circ}C$</TEX>) and <TEX>$ZnNb_2O_{6^-}25$</TEX> wt% ZBS(<TEX>$\varepsilon_r=15.8,\;Q{\times}f\;value=5,400GHz,\;\tau_f=-98ppm/^{\circ}C$</TEX>).