The demand for ultra-high-temperature piezoelectric sensors in industrial applications has witnessed a rapid upsurge. In this study, the piezoelectric properties of La 2 Ti 2 O 7 (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 ( d 33 ) value was achieved in Li/Ce-doped LTO ceramics compared to their pristine counterparts, reaching 6.4 pC N -1 at room temperature with an ultra-high Curie temperature of 1408 °C. After annealing at 500 °C, the d 33 value 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 × 10 5 Ω 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.
Keyphrases
- high resolution
- high temperature
- room temperature
- electron microscopy
- ion batteries
- quantum dots
- highly efficient
- single molecule
- magnetic resonance imaging
- energy transfer
- mass spectrometry
- machine learning
- ionic liquid
- magnetic resonance
- heavy metals
- electronic health record
- gold nanoparticles
- deep learning
- single cell
- metal organic framework
- risk assessment
- label free
- water soluble
- loop mediated isothermal amplification