Microstructures and Microwave Dielectric Properties of Ba((Co0.55Zn0.35Mg0.1)1/3Nb2/3)O3-BaZrO3 Ceramics

Microstructures and microwave dielectric properties of (1−x)Ba((Co0.55Zn0.35Mg0.1)1/3 Nb2/3)O3‐xBaZrO3 (x = 0.01, 0.02, 0.03, 0.04, 0.05, and 0.06) ceramics have been investigated. The 1:2 ordered structure remains in the solid solutions when x is less than 0.03, but the ordering is destabilized. While, the local ordering behavior, which generates from compositional inhomogeneous, is observed in the composition with x = 0.04, where the 1:1 ordered phase begins to form. For x = 0.05 and 0.06, the solid solutions are comprised of nanometer‐sized 1:1 and 1:2 ordered domains, those are dispersed in a disordered matrix. The lower Qf values of the as‐sintered ceramics mainly because of the lower ordering degrees. BaZrO3 substitution decreases both the annealing time and temperature. The effects of annealing process upon the improvement of Qf values are significant for the lower substitution levels (x = 0.01 and 0.02), while only slight effects are determined for high substitution levels (x = 0.04, 0.05, and 0.06). The highest Qf value of 84,500 GHz is obtained for 1 mol% BaZrO3 substituted composition, after annealing at 1300°C for 8 h.