Microwave dielectric properties of (1 − x)CeO2–xRE2O3 (RE = La, Nd, Sm, Eu, Gd, Dy, Er, Tm, Yb and Y) (0 ≤ x ≤ 1) ceramics

The (1 − x)CeO2–xRE2O3 (RE = La, Pr, Nd, Sm, Eu, Gd, Tb, Dy, Er, Tm, Yb and Y), 0 ≤ x ≤ 1 ceramics have been prepared by solid state ceramic route. The solubility of different rare earths (RE) in ceria was investigated by using XRD, SEM and EDXA techniques. The microwave dielectric properties of the ceramics having different compositions were investigated. Several high Q dielectric resonator compositions were identified in (1 − x)CeO2–xRE2O3 (RE = La, Nd, Sm, Eu, Gd, Dy, Er, Tm, Yb and Y), ceramics for 0 ≤ x ≤ 1. The best properties were obtained for 0.9CeO2–0.1Eu2O3 (ɛr = 25.4, Qu × f = 70,300 GHz, τf = −64 ppm/°C), 0.8CeO2–0.2Dy2O3 (ɛr = 26.2, Qu × f = 70,150 GHz, τf = −57 ppm/°C) and 0.3CeO2–0.7Sm2O3 (ɛr = 19.7, Qu × f = 79,450 GHz, τf = −51 ppm/°C).