Optimization of MgTiO3-CaTiO3 based LTCC tapes containing B2O3 for use in microwave applications

Optimization of MgTiO3-CaTiO3 based LTCC tapes to be used for microwave purposes was investigated. Three kinds of MgTiO3-CaTiO3 based powders containing B2O3 in different forms, and two different slurry systems (PVB and PM) were prepared for tape casting. The results clearly demonstrated that if the powder contained 'free' B2O3, no proper tape could be fabricated regardless of the slurry system. With other powders containing pre-reacted B2O3, dense tapes as well as multilayer strip line resonators could be fabricated. Difficulties to prepare proper tape from the powder containing 'free' B2O3 and different tape properties with different slurry systems are studied and discussed.