Enhancing piezoelectric coefficient and thermal stability in lead-free piezoceramics: insights at the atomic-scale.
basic_science · Level V
Where this comes from
- Record sourced from PubMed, PMID 39367032.
- Also identified by DOI 10.1038/s41467-024-53020-y and PMC identifier 11452656.
- Licence recorded as CC BY-NC-ND.
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Abstract
Given the highly temperature-sensitive nature of the polymorphic phase boundaries, attaining excellent piezoelectric coefficient with superior temperature stability in lead-free piezoceramics via direct compositional design remains a formidable challenge. We demonstrate the synergistic improvement of piezoelectric coefficient and thermal stability in lead-free piezoceramics via atomic-scale local ferroelectric structure design. Via modulation of the local Landau energy barrier at doping sites, we effectively mitigate fluctuations in piezoelectric d<sub>33</sub>. Our approach achieves an impressive d<sub>33</sub> of ~430 pC/N with a minimal temperature fluctuation range (△d<sub>33</sub> ~ 7%) across the room temperature to 100 °C in potassium sodium niobate ceramics. Further optimization through annealing extends this temperature up to 150 °C (△d<sub>33</sub> ~ 8%) while maintaining a high d<sub>33</sub> of ~380 pC/N, rivaling the performance of classic temperature stable lead zirconate titanate. This work establishes a framework for addressing the dilemma between high piezoelectric coefficient and inadequate temperature stability in lead-free piezoceramics.