Abstract
A microwave ceramic with general composition (1-x-y) BaTiO3 + x Cr2Ti3O9 + y Bi2O3 has been prepared by solid state synthesis at 1300–1400 °C. The phase composition, perovskite structural parameters and dielectric properties have been obtained by X-ray diffraction and dielectric measurements as a function of chemical composition and temperature. At low doping levels the formation of BaTiO3-based solid solution has been found. The precipitation of BaCrO3 has been detected at x = y = 2.0 mol%. A model of the incorporation of Cr3+ and Bi3+ ions into BaTiO3-based crystal lattice has been proposed. Diffused phase transition in the temperature range 100–140 °C have been revealed by dielectric measurements for different ceramic composition. As high dielectric constant as 7311 and as low dielectric loss as 0.02 have been found for the composition of 0.98BaTiO3-0.01Cr2Ti3O9-0.01Bi2O3.
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