New high-ɛ and high-Q microwave dielectric ceramics: (1 − x)Ca0.61Nd0.26TiO3 − xNd(Zn0.5Ti0.5)O3

New high-ɛ and high-Q microwave dielectric ceramics (1 − x)Ca0.61Nd0.26TiO3 − xNd(Zn0.5Ti0.5)O3 (x = 0.00–0.40, referred to as (1 − x)CNT − xNZT) were prepared by conventional solid-state preparation route. Single orthorhombic perovskite phase was formed when x was not beyond 0.15. And a secondary phase Zn2TiO4 appeared for x = 0.20, while ZnO was the secondary phase for the ceramics with x above 0.20. The dielectric constant and temperature coefficient of resonant frequency decreased steadily with increasing x-value. High Qf-value of above 10,000 GHz was achieved as x varied from 0.00 to 0.20. However, Qf-value decreased rapidly when x was beyond 0.20. Some (1 − x)CNT − xNZT ceramics with high ɛ and high Qf value were obtained: ɛ = 78.8, Qf = 19,200 GHz, τf = + 135 ppm/°C for x = 0.15; ɛ = 71.8, Qf = 17,300 GHz, τf = + 94 ppm/°C for x = 0.20.