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Issue 5, 2019
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Grain configuration effect on the phase transition, piezoelectric strain and temperature stability of KNN-based ceramics

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Abstract

Lead-free 0.985(0.96KNNT–0.04BNKZ)–0.015CZ ceramics were sintered at 1150–1190 °C. The average grain size increases from ∼0.54 μm to ∼1.26 μm on increasing the sintering temperature (Tsinter) from 1150 °C to 1190 °C. The increase of average grain size induces the R/T phase boundary to change to an O/T phase boundary at room temperature. An abnormal region in the ceramics sintered at 1170–1190 °C was observed where fine grains surround coarse grains that are the result of abnormal growth. The fine grains become smaller and their ratio increases, when Tsinter increases from 1150 °C to 1190 °C. The ceramics sintered at 1180 °C with good temperature stability (Te = 120 °C) and optimal room temperature piezoelectric strain (d33* = 482 pm V−1 at 35 kV cm−1) should be attributed to the suitable grain configuration. At Tsinter = 1150–1190 °C, the piezoelectric strain of the ceramics can be improved evidently without deteriorating the temperature stability visibly due to the formation of an abnormal region.

Graphical abstract: Grain configuration effect on the phase transition, piezoelectric strain and temperature stability of KNN-based ceramics

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Publication details

The article was received on 17 Oct 2018, accepted on 21 Dec 2018 and first published on 24 Dec 2018


Article type: Paper
DOI: 10.1039/C8TC05253K
Citation: J. Mater. Chem. C, 2019,7, 1379-1387

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    Grain configuration effect on the phase transition, piezoelectric strain and temperature stability of KNN-based ceramics

    Z. Cen, Y. Yu, P. Zhao, L. Chen, C. Zhu, L. Li and X. Wang, J. Mater. Chem. C, 2019, 7, 1379
    DOI: 10.1039/C8TC05253K

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