A/B Site Modified CaTiO 3 Dielectric Ceramics for Microwave Application

(Li 1/2 Nd 1/2 ) 2+ substitution into the A site and (Mg 1/3 Ta 2/3 ) 4+ substitution into the B site of CaTiO 3 ceramic were investigated, respectively. The modified CaTiO 3 dielectric ceramics prepared by conventional solid‐state method exhibit single perovskite structure and improved dielectric properties. Optimal microwave dielectric properties of ɛ r =112.6, Q × f =4480 GHz, τ f =8.2 ppm/°C in [Ca 0.4 (Li 1/2 Nd 1/2 ) 0.6 ] TiO 3 and ɛ r =60.2, Q × f =36900 GHz, τ f =−10.1 ppm/°C in Ca[Ti 0.4 (Mg 1/3 Ta 2/3 ) 0.6 ] O 3 are obtained, which indicates their potential for microwave application. The effects of change of crystal structure on dielectric properties are also discussed.