Stabilizing oxygen vacancies and promoting electrostrain in lead-free potassium niobate-based piezoelectrics over wide temperature ranges
Piezoelectric ceramics provide high strain and large driving forces in actuators. A large electrostrain can be realized by the introduction of point defects such as vacancies, interstitial defects, and substitution defects. With Mn doping, a significant increase in the reversible electrostrain from...
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| Main Authors: | , , , , , |
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| Format: | Article |
| Language: | English |
| Published: |
Tsinghua University Press
2024-12-01
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| Series: | Journal of Advanced Ceramics |
| Subjects: | |
| Online Access: | https://www.sciopen.com/article/10.26599/JAC.2024.9220989 |
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| Summary: | Piezoelectric ceramics provide high strain and large driving forces in actuators. A large electrostrain can be realized by the introduction of point defects such as vacancies, interstitial defects, and substitution defects. With Mn doping, a significant increase in the reversible electrostrain from 0.05% to 0.17% could be achieved in potassium niobite lead-free piezoelectric ceramics. The origins of the large electrostrain were analyzed via in situ X-ray diffraction (XRD) under an electric field. The electrostrain and other typical electrical properties of the samples were measured at various temperatures, which enabled the ceramics to perform under a very wide temperature range, such as −80–130 °C for the 0.5 mol% Mn-doped sample with low dielectric loss (≤ 0.02). More importantly, combined with characterizations of the defect behavior by thermally stimulated depolarization current (TSDC), the failure mechanisms of electrostrain in a high-temperature environment could be revealed, which was associated with synergistic damage to the defects caused by the electric field and high temperature. The results can provide good ideas and a basis for the design of piezoelectric materials with good electrostrain stability over a wide temperature range. |
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| ISSN: | 2226-4108 2227-8508 |