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Improved piezoelectricity in ternary potassium–sodium niobate lead-free ceramics with large strain

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Abstract

Although potassium–sodium niobate (KNN)-based ceramics with good piezoelectric performance have been obtained by a phase engineering strategy, a low electric field-induced strain (<0.2%) even when applying large electric fields is observed in the ceramics prepared by normal sintering, which hardly satisfies practical application demands. Here, a ternary lead-free material system of (0.965 − x)K0.5Na0.5Nb0.975Sb0.25O3–0.035Bi0.5Na0.5ZrO3xBiFeO3 (KNNS–BNZ–xBF, 0 ≤ x ≤ 0.008) ceramics with excellent overall performance has been designed, aiming to achieve balanced development between piezoelectric and strain properties. A systematic study of the phase structure, electric properties and temperature stability is carried out on the ceramics, and the optimal electric properties (e.g., d33 ≈ 511 pC N−1, Suni ≈ 0.202%, d33* ≈ 505 pm V−1, and Tc ≈ 269 °C) are obtained at x = 0.007 owing to the large tetragonality and R–T phase structure with low polarization anisotropy as well as weak energy barriers. Moreover, a new approach used to evaluate coercivity (Ec) qualitatively provides more choices to identify Ec in ferroelectrics. We believe that it may promote the application of lead-free piezoelectric materials.

Graphical abstract: Improved piezoelectricity in ternary potassium–sodium niobate lead-free ceramics with large strain

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Article information


Submitted
14 Oct 2019
Accepted
13 Jan 2020
First published
15 Jan 2020

J. Mater. Chem. C, 2020, Advance Article
Article type
Paper

Improved piezoelectricity in ternary potassium–sodium niobate lead-free ceramics with large strain

B. Wu, J. Ma, W. Wu and M. Chen, J. Mater. Chem. C, 2020, Advance Article , DOI: 10.1039/C9TC05629G

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