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A new low sintering temperature microwave dielectric ceramic, Li2ZnTi3O8, was investigated. X-ray diffraction data show that Li2ZnTi3O8 has a cubic structure [P4332(212)] with lattice parameters a = 8.37506 Å, V = 587.44 Å3, and Z = 4 when the sintering temperature is 1050 °C. The Li2ZnTi3O8 ceramic exhibits good microwave dielectric properties with εr about 26.2, Q×f value about 62,000 GHz, and τf about −15 ppm/°C. The addition of BaCu(B2O5) can effectively lower the sintering temperature from 1050 to 900 °C without degrading the microwave dielectric properties. Compatibility with Ag electrode indicates this material can be applied to low temperature cofired ceramic devices.

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Polycrystalline sample of Ba4LiNb3O12 is synthesized in the temperature range of 1150°–1180°C by the conventional solid‐state reaction method. A phase transition from cubic to hexagonal perovskite is observed around 1160°C. It is noted that hexagonal phase of Ba4LiNb3O12 obtained at 1180°C could be stabilized at a considerably lower temperature (∼950°C) with BaCu(B2O5) (BCB) added. BCB addition effectively improves the densification of Ba4LiNb3O12 ceramic and significantly affects the microwave dielectric properties. When 4 wt% BCB is added, a dense ceramic can be sintered at 950°C with a ɛr of 34.5, a high Q×f of 29 600 GHz, and a low τf of 12.4 ppm/°C. Moreover, BCB‐added Ba4LiNb3O12 ceramics have a chemical compatibility with silver.