Enhanced Electrical Property and Thermal Stability in Lead-Free BNT–BT–BF Ceramics
The synergistic combination of outstanding electrical properties and exceptional thermal stability holds significant implications for advancing piezoelectric ceramic applications. In this work, lead-free ((1−x)(0.94Bi<sub>0.5</sub>Na<sub>0.5</sub>TiO<sub>3</sub>-0...
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| Main Authors: | , , , , |
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| Format: | Article |
| Language: | English |
| Published: |
MDPI AG
2025-06-01
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| Series: | Ceramics |
| Subjects: | |
| Online Access: | https://www.mdpi.com/2571-6131/8/2/70 |
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| Summary: | The synergistic combination of outstanding electrical properties and exceptional thermal stability holds significant implications for advancing piezoelectric ceramic applications. In this work, lead-free ((1−x)(0.94Bi<sub>0.5</sub>Na<sub>0.5</sub>TiO<sub>3</sub>-0.06BaTiO<sub>3</sub>)-xBiFeO<sub>3</sub> (x = 0.08, 0.10, 0.12)) ceramics were synthesized using a conventional solid-state method, with systematic investigation of phase evolution, microstructural characteristics, and their coupled effects on electromechanical performance and thermal stability. Rietveld refinement analysis revealed a rhombohedral–tetragonal (R–T) phase coexistence, where the tetragonal phase fraction maximized at x = 0.10. This structural optimization enabled the simultaneous enhancement of piezoelectricity and thermal resilience. The x = 0.10 composition achieved recorded values of <i>d</i><sub>33</sub> = 132 pC/N, <i>g</i><sub>33</sub> = 26.11 × 10<sup>−3</sup> Vm/N, and a depolarization temperature <i>T</i><sub>d</sub> = 105 °C. These findings establish BiFeO<sub>3</sub> doping as a dual-functional strategy for developing high-performance lead-free ceramics. |
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| ISSN: | 2571-6131 |