Effect of Superstoichiometric Bismuth Addition on the Structure and Dielectric Characteristics of the Solid Solutions (1−<i>x</i>)BiFeO<sub>3</sub>-<i>x</i>BaTiO<sub>3</sub>
Ceramic samples of solid solutions of the binary system (1−<i>x</i>)BiFeO<sub>3</sub>-<i>x</i>BaTiO<sub>3</sub> + 2 wt.% Bi<sub>2</sub>O<sub>3</sub> (0.29 ≤ x ≤ 0.33, Δx = 0.01) were prepared using the conventional solid-phase r...
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| Main Authors: | , , , , , |
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| Format: | Article |
| Language: | English |
| Published: |
MDPI AG
2025-01-01
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| Series: | Ceramics |
| Subjects: | |
| Online Access: | https://www.mdpi.com/2571-6131/8/1/7 |
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| Summary: | Ceramic samples of solid solutions of the binary system (1−<i>x</i>)BiFeO<sub>3</sub>-<i>x</i>BaTiO<sub>3</sub> + 2 wt.% Bi<sub>2</sub>O<sub>3</sub> (0.29 ≤ x ≤ 0.33, Δx = 0.01) were prepared using the conventional solid-phase reaction method with and without mechanical activation. Using X-ray studies, it was found that the objects have a pseudocubic crystal structure, and limited solubility occurs in solid solutions of the studied composition, as evidenced by the presence of regions with an increased Bi or Ba content and similar cell parameters. A diffuse phase transition occurred from the FE to PE state in the temperature ranges of (650–850) K. Relaxor-like behavior and the smearing of the phase transition in the studied ceramics can be associated with the presence of non-interacting regions with an increased content of Bi or Ba, different modulation, and crystal lattice symmetry. The grain morphology and dielectric characteristics of the selected solid solutions were investigated. The highest piezoelectric coefficient, d<sub>33</sub> = 120 pC/N, was obtained in the mechanically activated ceramics 0.71BiFeO<sub>3</sub>-0.29BaTiO<sub>3</sub> + 2 wt.% Bi<sub>2</sub>O<sub>3</sub>. |
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| ISSN: | 2571-6131 |