Abstract
Ceramics with a composition close to BaZn 2Ti 4O 11 were synthesized according to various substitutional mechanisms in order to verify an existence of a homogeneity range in the vicinity of this composition. Structural and microstructural investigations showed that the crystal structure of BaZn 2Ti 4O 11 was formed in the homogeneity range corresponding to the formula BaZn 2 − x Ti 4O 11 − x (0 < x < 0.1). Densely sintered BaZn 2 − x Ti 4O 11 − x (0 < x < 0.1) ceramics exhibited a dielectric constant around 30, τ f = −30 ppm/K and high Q × f values, which increased from ∼68,000 GHz at x = 0 to ∼83,000 GHz at x = 0.05. Structurally, the deficiency of Zn in BaZn 2 − x Ti 4O 11 − x (0 < x < 0.1) resulted in a slight decrease in the unit-cell volume. The influence of secondary phases in the BaZn 2Ti 4O 11-based materials on the microwave dielectric properties was also investigated. A presence of small amounts of ZnO, BaTiO 3, hollandite-type solid solutions (Ba x Zn x Ti 8 − x O 16) and BaTi 4O 9 caused a decrease in Q × f values.
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