Low‐Temperature Firing and Microwave Dielectric Properties of Ca[(Li 1/3 Nb 2/3 ) 0.84 Ti 0.16 ]O 3−δ Ceramics for LTCC Applications

The effects of LiF and ZnO–B 2 O 3 –SiO 2 (ZBS) glass combined additives on phase composition, microstructures, and microwave dielectric properties of Ca[(Li 1/3 Nb 2/3 ) 0.84 Ti 0.16 ]O 3−δ (CLNT) ceramics were investigated. The LiF and ZBS glass combined additives lowered the sintering temperature of CLNT ceramics effectively from 1150° to 880°C. The main diffraction peaks of all the specimens split due to the coexistence of the non‐stoichiometric phase (A) and stoichiometric phase (B), which all possess CaTiO 3 ‐type perovskite structures. The transformation from A into B became accelerated with the increase of LiF or ZBS content. ZBS glass restrained the volatilization of lithium salt, which greatly affected the microstructures and microwave dielectric properties. CLNT ceramics with 2 wt% LiF and 3 wt% ZBS sintered at 900°C for 2 h show excellent dielectric properties: ɛ r =34.3, Q × f =17 400 GHz, and τ f =−4.6 ppm/°C. It is compatible with Ag electrodes, which makes it a promising ceramic for low‐temperature cofired ceramics technology application.