Relationships between Zr substitution for Ti and microwave dielectric properties in Mg(Zr xTi 1− x)O 3 ceramics

Abstract

The influence of Zr substitution for Ti on the microwave dielectric properties and microstructures of the Mg(Zr x Ti 1− x )O 3(MZ x T) (0.01 ≤ x ≤ 0.3) ceramics was investigated. The quality factors of Mg(Zr x Ti 1− x )O 3 ceramics with x = 0.01–0.05 were improved because the solid solution of a small amount of Zr 4+ substitution in the B-site could increase density and grain size. An excess of Zr 4+ resulted in the formation of a great deal of secondary phase that declined the microwave dielectric properties of MZ x T ceramics. The temperature coefficient of resonant frequency ( τ f ) of Mg(Zr x Ti 1− x )O 3 ceramics slightly increased with increasing Zr content, and the variation in τ f was attributed to the formation of secondary phases.