Electromechanical coupling in piezoelectric materials allows direct conversion of electrical energy into mechanical energy and vice versa. Here, we demonstrate lead-free (K Na )NbO single crystals with an ultrahigh large-signal piezoelectric coefficient * of 9000 pm V, which is superior to the highest value reported in state-of-the-art lead-based single crystals (~2500 pm V). The enhanced electromechanical properties in our crystals are realized by an engineered compositional gradient in the as-grown crystal, allowing notable reversible non-180° domain wall motion. Moreover, our crystals exhibit temperature-insensitive strain performance within the temperature range of 25°C to 125°C. The enhanced temperature stability of the response also allows the materials to be used in a wider range of applications that exceed the temperature limits of current lead-based piezoelectric crystals.
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| http://www.ncbi.nlm.nih.gov/pmc/articles/PMC7101228 | PMC |
| http://dx.doi.org/10.1126/sciadv.aay5979 | DOI Listing |
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