Please use this identifier to cite or link to this item: http://hdl.handle.net/10397/43703
Title: Structure evolution and enhanced piezoelectric properties of (K<inf>0.5</inf>Na<inf>0.5</inf>)NbO<inf>3</inf>-0.06LiTaO<inf>3</inf>-SrZrO<inf>3</inf> lead-free ceramics
Authors: Yan, X
Peng, B
Lu, X
Dong, Q
Li, W
Keywords: Lead-free ceramics
Phase transitions
Piezoelectricity
Rhombohedral-tetragonal phase boundary
Issue Date: 2015
Publisher: Elsevier
Source: Journal of alloys and compounds, 2015, v. 653, 35330, p. 523-527 How to cite?
Journal: Journal of alloys and compounds 
Abstract: (K<inf>0.5</inf>Na<inf>0.5</inf>)NbO<inf>3</inf>-0.06LiTaO<inf>3</inf>-xSrZrO<inf>3</inf> (KNN-LT-xST) lead-free piezoelectric ceramics with rhombohedral-tetragonal (R-T) phase boundary have been designed and prepared by the conventional solid-state reaction method, the phase transitional behavior and composition-dependent piezoelectric properties of KNN-LT-xST lead-free system were investigated. The R-T phase boundary is identified in the KNN-LT-xST ceramics with a composition of 0.04 ≤ x ≤ 0.06. The ceramics in the vicinity of the R-T phase coexistence zone exhibit a strong compositional dependence and significantly enhanced piezoelectric properties. A comprehensive performance of d<inf>33</inf> (222-254 pC/N) and T<inf>c</inf> (282-312 °C) could be obtained in the KNN-LT-xSZ ceramics with 0.04 ≤ x ≤ 0.06 by tailoring the SrZrO<inf>3</inf> content. The ceramic with x = 0.045 shows the optimum electrical properties: d<inf>33</inf> = 254 pC/N, k<inf>p</inf> = 28%, ε<inf>r</inf> = 758, tanδ = 1.7%, P<inf>r</inf> = 8.98 μC/cm2 and T<inf>c</inf> = 300 °C. The existence of an R-T phase boundary and therefore the involvement of the more polarization states should be responsible for the enhanced piezoelectric properties of the KNN-LT-xSZ ceramics. The good piezoelectric properties together with a high cubic-tetragonal phase transition temperatures (T<inf>c</inf>) make the KNN-LT-xSZ ceramics showing the promising lead-free piezoelectric material system for the practical applications.
URI: http://hdl.handle.net/10397/43703
ISSN: 0925-8388
DOI: 10.1016/j.jallcom.2015.09.055
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