Effect of Ba addition on the dielectric properties and microstructure of (Ca0.6Sr0.4)ZrO3

This study focuses on the synthesis and characterization of Ca0.6Sr0.4-xBaxZrO3 (x = 0.01, 0.04, 0.07, and 0.10) ceramics prepared via the solid-state method and sintered at 1450 °C. The impact of Sr substitution by Ba at the A-site of the perovskite structure on crystalline properties and microwave dielectric performance was investigated. The experimental results show the formation of a single-phase structure, Ca0.612Sr0.388ZrO3(CSZ), across the entire range of x values. It is evident that the Ca0.6Sr0.39Ba0.01ZrO3 ceramics exhibits the highest sintering density and the lowest porosity. These ceramics exhibit impressive dielectric properties, including a high permittivity of 28.38, low dielectric loss of 4.0×10−4, and a Q factor value of 22988 at 9–10 GHz. The research reveals that the influences of Sr substitution by Ba in enhancing the microwave dielectric properties of Ca0.612Sr0.388ZrO3 ceramics, and the impedance curves clearly showed effects on the electrical properties.