Thermally enhanced piezoelectricity via the superstructure in Ca2Nb2O7 single-crystals with ultra-high Curie temperature. Issue 38 (6th September 2022)

• Record Type: Journal Article
• Authors: Wang, Xiaohan; Zhou, Qiang; Li, Fangfei; Wu, Chen; Gong, Meiqi; He, Songying; Li, Xinyang; Sun, Enwei; Ge, Wenwei; Li, Peng; Li, Liang; Cui, Tian
• Is Part Of: Journal of materials chemistry. Volume 10:Issue 38(2022)
• Page Start: 20473
• Page End: 20481
• Publication Date: 2022-09-06
• Subjects: Materials -- Research -- Periodicals; Chemistry, Analytic -- Periodicals; Environmental sciences -- Research -- Periodicals; 543.0284
• DOI: 10.1039/d2ta03412c
• Languages: English
• ISSNs: 2050-7488

Abstract

Abstract : Based on the microstructure and molecular vibrations, the mechanism of thermally enhanced piezoelectricity is clarified for Ca2 Nb2 O7 with ultra-high T c . 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 ( T c ). The perovskite-like layered structure (PLS) Ca2 Nb2 O7 is considered a potential candidate with ultra-high T c (1773 K). Herein, we prepared Ca2 Nb2 O7 single-crystals by the optical floating zone (OFZ) method. The piezoelectric constant d 33 of Ca2 Nb2 O7 along the b -axis reaches 10.4 pC N −1 at room temperature and the d 33 is enhanced to 15.2 pC N −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 d 33 of Ca2 Nb2 O7 were clarified based on the microstructure, lattice structure, and vibration by completely characterizing the corresponding parameters.