Low-temperature sintering and microwave dielectric properties of a new Ba/Ti-based diphase composite ceramic

Authors：He, Lei; Jiang, Xuewen; Xu, Yuanjie; Zuo, Ruzhong^*

Source：Journal of Materials Science, 2022, 57(26): 12356-12363.

DOI：10.1007/s10853-022-07440-0

The phase composition, grain morphology and microwave dielectric performances of a novel BaZn2Ti4O11-based (BZT) composite ceramic were investigated through X-ray diffraction, scanning electron microscopy and vector network analyzer. BaCu(B2O5) (BCB) and Ba3Ti4Nb4O21 (BTN) were utilized as sintering aid and tau(f)-tailoring material, respectively. Due to the large difference in crystal structure, BZT and BTN can coexist well during the sintering process. While EDS results show that ionic diffusion occurred between the two phases. The addition of BCB accelerates the densification process and promotes grain growth. The dielectric performances of composite ceramics are mainly affected by the sample density and the molar ratio of BZT and BTN. A temperature-stable composite ceramic of epsilon(r) = 31.8, Q x f = 46,610 GHz (f = 6.102 GHz), tau(f) = - 1.3 ppm/degrees C was acquired for the 0.9BZT-0.1BTN sample sintered at 1075 degrees C for 4 h, exhibiting a great development prospect in the application of microwave devices.