Fabrication of Ba(Ca1/9Y3/9B5/9)O3 (B=Nb, Ta) ceramics and their microwave dielectric properties

Abstract

The products and microwave dielectric properties of ceramics with nominal composition (Ba_0.9Ca_0.1) (Y_xB'_1/2)O_(3x+4.5)/2 (B'= Nb⁵⁺, Ta⁵⁺) are investigated. The product of a single phase is synthesized when x = 0.3. Accordingly, the formula of the compound is Ba(Ca_1/9Y_3/9Nb_5/9)O₃ or Ba(Ca_1/9Y_3/9Ta_5/9)O₃. The relative permittivities (&epsilon_r) of these new compounds are larger than those of Ba(Y_1/2B'_1/2)O₃ (B' =Nb⁵⁺, Ta⁵⁺). Moreover, the increase in &epsilon_r of the Nb-system is about four times larger than that of the Ta-system.