The sintering and microwave dielectric characteristics of MgTa1.5Nb0.5O6 ceramics

MgTa1.5Nb0.5O6 ceramics were combined from two microwave dielectrics with high Q × f values and high τf values, MgTa2O6 (sintered at 1500 °C, ɛr = 30.5, Q × f = 56,900 GHz, and τf = 28.3 ppm/°C) and MgNb2O6 (sintered at 1300 °C, ɛr = 21.7, Q × f = 89,900 GHz, and τf = −68.5 ppm/°C) MgNb2O6, in order to obtain microwave dielectric resonators with τf value close to 0 ppm/°C. The sintering and microwave dielectric characteristics of MgTa1.5Nb0.5O6 ceramics were investigated in this study. As the sintering temperature increased from 1300 °C to 1450 °C, the density values, the ɛr values, and the Q × f values of MgTa1.5Nb0.5O6 ceramics increased and saturated at 1450 °C, and τf values were shifted to close 0 ppm/°C. The 1450 °C-sintered MgTa1.5Nb0.5O6 ceramics had the microwave dielectric characteristics of ɛr = 27.9, Q × f = 33,100 GHz, and τf = −0.7 ppm/°C.