| Autor: |
Tang, Manjing, Tan, Zhi, Xing, Jie, Chen, Hao, Yang, Xinji, Li, Hongjiang, Zhang, Wen, Zhu, Jianguo |
| Zdroj: |
Materials Horizons; 2024, Vol. 11 Issue: 12 p2898-2905, 8p |
| Abstrakt: |
The demand for ultra-high-temperature piezoelectric sensors in industrial applications has witnessed a rapid upsurge. In this study, the piezoelectric properties of La2Ti2O7(LTO) piezoelectric ceramics with a perovskite-like layered structure were enhanced by doping with Li/Ce ions. It was found that a remarkable 300% enhancement in the piezoelectric constant (d33) value was achieved in Li/Ce-doped LTO ceramics compared to their pristine counterparts, reaching 6.4 pC N−1at room temperature with an ultra-high Curie temperature of 1408 °C. After annealing at 500 °C, the d33value of the samples can be further improved to 7.4 pC N−1. Moreover, temperature-dependent resistivity measurements indicate that even at 1000 °C, the ceramics exhibit a high resistivity of 8.9 × 105Ω cm. By combining X-ray diffraction, Raman spectra, transmission electron microscopy and piezoresponse force microscopy data, the enhanced piezoelectricity of the ceramics is attributed to local heterogeneity induced by Li/Ce doping. Our results unequivocally demonstrate the suitability of modified LTO ceramics for ultra-high-temperature piezoelectric applications. |
| Databáze: |
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