Hexagonal Ba(Ti1−xMnx)O3 ceramics: Microstructural evolution and microwave dielectric properties

Up to date, little work has been done to explore the possible application of the high-temperature 6H-hexagonal BaTiO3 polymorph (h-BaTiO3). In this letter, the feasibility for use of h-BaTiO3 ceramics as microwave dielectric resonators was evaluated through the Mn substitution in B sites. Based on the overall performance, the best results were acquired for the h-Ba(Ti0.65Mn0.35)O3 (εr:41.2, Q∙fr:14300, and τf:18.6ppm∕°C) and h-Ba(Ti0.50Mn0.50)O3 ceramics (εr:32.8, Q∙fr:6,450, and τf:3.6ppm∕°C). These results suggest the hexagonal Ba(Ti1−xMnx)O3 ceramics are suited for the dielectric resonator applications.