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Issue 3, 2017
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Poling engineering of (K,Na)NbO3-based lead-free piezoceramics with orthorhombic–tetragonal coexisting phases

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Abstract

(K,Na)NbO3 (KNN) is considered as one of the most promising candidates for lead-free piezoelectric ceramics, due to its large piezoelectric response as well as high Curie temperature. In the present study, the effect of various poling conditions on CaZrO3-modified KNN-based lead-free piezoceramics was investigated. Featured by a polymorphic phase transition around ambient temperature, the samples differ from conventional Pb(Zr,Ti)O3-based (PZT) ceramics in phase constitution, which inevitably influences the optimal poling conditions. It is found that the KNN ceramics can reach a saturated polarization state under reduced poling field and at short times, compared with PZT. Besides, poling at a relatively high temperature of 120 °C can yield an enhanced piezoelectric constant d33 of up to 345 pC N−1. The poling behavior of CaZrO3-modified KNN-based ceramics is rationalized by the competition between domain reorientation and space charge accumulation.

Graphical abstract: Poling engineering of (K,Na)NbO3-based lead-free piezoceramics with orthorhombic–tetragonal coexisting phases

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Publication details

The article was received on 01 Nov 2016, accepted on 05 Dec 2016 and first published on 05 Dec 2016


Article type: Paper
DOI: 10.1039/C6TC04723H
Citation: J. Mater. Chem. C, 2017,5, 549-556
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    Poling engineering of (K,Na)NbO3-based lead-free piezoceramics with orthorhombic–tetragonal coexisting phases

    Q. Li, M. Zhang, Z. Zhu, K. Wang, J. Zhou, F. Yao and J. Li, J. Mater. Chem. C, 2017, 5, 549
    DOI: 10.1039/C6TC04723H

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