Cyclic properties and impedance analysis of (Li, Na, K)NbO3-based multilayered piezoceramics. (27th August 2020)

• Record Type: Journal Article
• Authors: Nishiyama, Hiroshi; Kakimoto, Ken-ichi; Hatano, Keiichi; Kishimoto, Sumiaki; Sasaki, Nobuhiro
• Is Part Of: Japanese journal of applied physics. Volume 59:Number SP(2020)
• Publication Date: 2020-08-27
• Subjects: Lead-free alkali niobate piezoceramics -- Multilayer piezoceramics -- Unipolar fatigue -- Unipolar P–E hysteresis measurement -- Impedance spectroscopy -- Domain wall pinning; Physics -- Periodicals; 621.05
• DOI: 10.35848/1347-4065/abad17
• Languages: English
• ISSNs: 0021-4922

Abstract

Abstract: (Li, Na, K)NbO3 -based multilayered piezoceramics were characterized by performing unipolar polarization electric field measurements and impedance spectroscopy. Subjecting an as-poled sample to up to 10 7 cycles in an applied 4 kV mm −1 unipolar cyclic field at 100 °C reduced its polarization by 8.9%. The impedance spectra of as-sintered, as-poled, and fatigued samples were acquired and analyzed. Two relaxation processes reported to occur in single-layered (Na, K)NbO3 -based ceramics were identified. They occurred at inner domains and interfaces, including domain walls (DWs) and grain boundaries, below the Curie temperature ( T C, 450 °C). The electrical properties of the samples were evaluated by two resistance-constant phase element (2 R-CPE) equivalent circuit analysis. The results indicated that DW pinning was the primary cause of unipolar fatigue.