The lower phase-forming temperature of magnesium titanate, MgTiO₃, means that it can be used to replace magnesium ions with cobalt ions at 0.05 mole when a mixture of diverse low melting point materials as sintering accelerators is employed (single: B₂O₃, CuO, V₂O₅, ZnO; binary: ZnO-B₂O₃). The phase formation of 0.9Mg_0.95Co_0.05TiO₃ - 0.1 Ca_0.61Nd_0.78/3TiO₃ dielectric ceramics was verified using XRD diffraction to observe crystallites at different phases. SEM was used to observe the grain growth of the ceramic system, and the composition ratio of the grain was analyzed via EDS. Compared with 0.9Mg_0.95Co_0.05TiO₃ - 0.1 Ca_0.61Nd_0.78/3TiO₃ dielectric ceramics without the addition of a sintering accelerator, the results show that the sintering temperature could be effectively decremented, and the results of the binary addition were better than the single result. The microwave dielectric performances of 0.9Mg_0.95Co_0.05TiO₃ - 0.1Ca_0.61Nd_0.78/3TiO₃ dielectric ceramics were closely related to the density and growth of grains experienced by the specimens. When 1 wt% binary sintering accelerators (ZnO-B₂O₃) were added to 0.9Mg_0.95Co_0.05TiO₃-0.1 Ca_0.61Nd_0.78/3TiO₃ dielectric ceramics, they showed an ε_r value of 21.7, a Qf value of 42,000 GHz, and a τ_f value of -27.2 ppm/^oC; the phase-forming temperature was minimized from 1350 ^oC to 1150 ^oC.

Keywords: Dielectric ceramics, Phase-forming, Microwave dielectric performances, Sintering accelerator.