Issue 38, 2022

Thermally enhanced piezoelectricity via the superstructure in Ca2Nb2O7 single-crystals with ultra-high Curie temperature

Abstract

Due to the requirements of sustainable development and the widening application range, it is very necessary to develop lead-free eco-friendly piezoelectric materials with ultra-high Curie temperatures (Tc). The perovskite-like layered structure (PLS) Ca2Nb2O7 is considered a potential candidate with ultra-high Tc (1773 K). Herein, we prepared Ca2Nb2O7 single-crystals by the optical floating zone (OFZ) method. The piezoelectric constant d33 of Ca2Nb2O7 along the b-axis reaches 10.4 pC Nāˆ’1 at room temperature and the d33 is enhanced to 15.2 pC Nāˆ’1 when the temperature increases from 273 to 750 K. Furthermore, the origin of piezoelectricity as well as the mechanism of the orientation-dependent and thermally enhanced d33 of Ca2Nb2O7 were clarified based on the microstructure, lattice structure, and vibration by completely characterizing the corresponding parameters.

Graphical abstract: Thermally enhanced piezoelectricity via the superstructure in Ca2Nb2O7 single-crystals with ultra-high Curie temperature

Supplementary files

Article information

Article type
Paper
Submitted
28 Apr 2022
Accepted
22 Aug 2022
First published
22 Aug 2022

J. Mater. Chem. A, 2022,10, 20473-20481

Thermally enhanced piezoelectricity via the superstructure in Ca2Nb2O7 single-crystals with ultra-high Curie temperature

X. Wang, Q. Zhou, F. Li, C. Wu, M. Gong, S. He, X. Li, E. Sun, W. Ge, P. Li, L. Li and T. Cui, J. Mater. Chem. A, 2022, 10, 20473 DOI: 10.1039/D2TA03412C

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