Temperature‐Compensated LiMgPO4: A New Glass‐Free Low‐Temperature Cofired Ceramic

The feasibility of LiMgPO 4 (LMP) ceramic for low‐temperature cofired ceramic (LTCC) application was investigated. The ceramic was prepared by the conventional solid‐state ceramic method. The ceramic sintered at 950°C showed a relative permittivity (ɛ r ) of 6.6 and high quality factor ( Q u × f ) of 79 100 GHz with a τ f of −55 ppm/°C. The relatively large negative τ f value was lowered by preparing LMP–TiO 2 composite. The composite with 0.12 volume fraction TiO 2 showed good microwave dielectric properties: ɛ r =10, Q u × f =26 900 GHz, and τ f =+1.2 ppm/°C. LMP–TiO 2 composite did not react with the commonly used electrode material silver.