Enhancement of piezoelectric properties and temperature stability by forming an MPB in KNN-based lead-free ceramics
| Autor: | Zong-Yang Shen, Fen Wu, Zu-Gui Xiao, Tie-Zheng Pan, Zhumei Wang, Yueming Li |
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| Rok vydání: | 2013 |
| Předmět: |
Electromechanical coupling coefficient
Phase boundary Materials science Piezoelectric coefficient Condensed matter physics Solid-state reaction route Analytical chemistry Condensed Matter Physics Piezoelectricity Atomic and Molecular Physics and Optics Electronic Optical and Magnetic Materials Tetragonal crystal system Curie temperature Dielectric loss Electrical and Electronic Engineering |
| Zdroj: | Journal of Materials Science: Materials in Electronics. 25:1028-1032 |
| ISSN: | 1573-482X 0957-4522 |
| DOI: | 10.1007/s10854-013-1682-4 |
| Popis: | 0.92(Na0.51K0.49−x Li x )NbO3–0.02Bi0.5K0.5TiO3–0.06BaZrO3 (x = 0, 0.01, 0.02, 0.03, 0.04, and 0.05) lead-free piezoelectric ceramics were prepared by solid state reaction route. The effect of Li doping amount on the structure and electrical properties of the ceramics were investigated. All ceramics had pure perovskite structure, while the crystallographic symmetry changed from rhombohedral to tetragonal with the increase of Li doping amount. A PZT-like morphotropic phase boundary (MPB) with the coexistence of rhombohedral and tetragonal phases was identified in the composition of x = 0.03. As expected, the ceramics of the MPB composition showed optimal properties: piezoelectric coefficient d 33 = 227 pC/N, planar electromechanical coupling coefficient k p = 39.3 %, dielectric permittivity $$ \varepsilon_{33}^{T} /\varepsilon_{0} $$ = 1,640, dielectric loss tanδ = 2.0 %, remnant polarization P r = 13.3 μC/cm2, coercive field E c = 1.53 kV/mm, and Curie temperature T c = 253 °C. Together with good temperature stability to 200 °C, this KNN-based lead-free ceramics should be very promising for practical applications. |
| Databáze: | OpenAIRE |
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