A/B Site Modified CaTiO3 Dielectric Ceramics for Microwave Application.

(Li1/2Nd1/2)2+ substitution into the A site and (Mg1/3Ta2/3)4+ substitution into the B site of CaTiO3 ceramic were investigated, respectively. The modified CaTiO3 dielectric ceramics prepared by conventional solid-state method exhibit single perovskite structure and improved dielectric properties. Optimal microwave dielectric properties of ℇr=112.6, Q× f=4480 GHz, τf=8.2 ppm/°C in [Ca0.4(Li1/2Nd1/2)0.6] TiO3 and ℇr=60.2, Q× f=36900 GHz, τf=−10.1 ppm/°C in Ca[Ti0.4(Mg1/3Ta2/3)0.6] O3 are obtained, which indicates their potential for microwave application. The effects of change of crystal structure on dielectric properties are also discussed. [ABSTRACT FROM AUTHOR]