Strontium/titanium cosubstituted Ba4Sm2Ti4Ta6O30 dielectric ceramics

Modification of the dielectric properties of Ba4Sm2Ti4Ta6O30 ceramics by Sr substitution for Ba on the A-sites and Ti substitution for Ta on the B-sites was investigated. With increasing Ti concentration, the temperature coefficient of the dielectric constant was significantly improved together with decreased dielectric loss and slightly decreased dielectric constant. The minimum temperature coefficient of −470ppm/°C was obtained in the composition of Ba2Sr2Sm2Ti4+xTa6−xO30−x/2(x=3.0) with ε=111, Qf=200 GHz.