Abstract
The Ba-substituted Sr1−x Ba x (Fe0.5Nb0.5)O3 (SBFN, x = 0, 0.2, 0.5, 0.8) ceramics were prepared by a conventional solid-state sintering, and their microstructure and dielectric properties were investigated. The single-phase SBFN were obtained up to x = 0.8 Ba substitution and the lattice parameter increased with Ba substitution concentration. The dielectric constant increased with Ba substitution, and the highest value of ~180,000 was observed in the x = 0.8 Ba-substituted specimen at 1 kHz. Besides, the dielectric constant increased rapidly a giant value more than 106 over a broad temperature range for x = 0.8 Ba-substituted specimen. The obtained electric and dielectric properties in Ba-substituted SBFN were discussed in terms of the internal barrier layer capacitor model and electrode response.
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