Abstract
Spinel materials of composition Zn1−xCuxAl2O4 (ZCA, x = 0–0.015) were prepared via the conventional solid‐state route. The lattice structure, microstructure, and microwave dielectric properties were investigated as a function of Cu content. Cu doping was found to improve the sinterability and, meanwhile, significantly increase the quality factor (Q × f0), which is due to the Cu‐O bond is stronger than Zn‐O bond, and inhibit the oxygen vacancy considered to be responsible for the enhanced Q × f0 value of ZCA materials. The best microwave dielectric properties were obtained in Zn0.99Cu0.01Al2O4 with εr = 8.69, Q × f0 = 69,300 GHz and τf = −58.3 ppm/°C, which was sintered at 1520°C for 3 h in air.
Published Version
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