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Issue 39, 2018
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Simultaneous enhancement of piezoelectricity and temperature stability in (K,Na)NbO3-based lead-free piezoceramics by incorporating perovskite zirconates

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Abstract

(K,Na)NbO3 is a leading lead-free piezoelectric system, but its thermal instability of high piezoelectricity is still one of its shortcomings compared to its lead-containing counterparts. This work found that incorporating perovskite compounds with Zr ions at the B-site can lead to the simultaneous enhancement of piezoelectricity and thermal stability. The piezoelectric coefficient d33 increased to ∼450 pC N−1, and such a high d33 value can be maintained within 10% change over a wide temperature range of 22–80 °C. The piezoelectric strain also reached 0.13% strain with a small variation (<10%) from room temperature to 130 °C. The intrinsic and extrinsic contributions to the piezoelectric effect were determined using a modified Rayleigh law as well as systematic analyses on the crystalline structure and electrical properties. A phenomenological interpretation is provided for the origin of the strong piezoelectricity and thermal stability in the diffused O–T phase transition. This study provides a new paradigm for the enhancement of electrical properties and thermal stability in lead-free piezoceramics.

Graphical abstract: Simultaneous enhancement of piezoelectricity and temperature stability in (K,Na)NbO3-based lead-free piezoceramics by incorporating perovskite zirconates

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Publication details

The article was received on 21 Jul 2018, accepted on 07 Sep 2018 and first published on 07 Sep 2018


Article type: Paper
DOI: 10.1039/C8TC03610A
Citation: J. Mater. Chem. C, 2018,6, 10618-10627
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    Simultaneous enhancement of piezoelectricity and temperature stability in (K,Na)NbO3-based lead-free piezoceramics by incorporating perovskite zirconates

    Q. Liu, Y. Zhang, L. Zhao, J. Gao, Z. Zhou, K. Wang, X. Zhang, L. Li and J. Li, J. Mater. Chem. C, 2018, 6, 10618
    DOI: 10.1039/C8TC03610A

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