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Issue 41, 2016
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Balanced development of piezoelectricity, Curie temperature, and temperature stability in potassium–sodium niobhrate lead-free ceramics

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Abstract

(K,Na)NbO3 (KNN)-based ceramics are highly expected to attain a large piezoelectricity (d33), high Curie temperature (TC) and improved temperature stability. In this study, we modified both d33 and TC by the construction of phase boundaries using a different chemical composition. As shown in this manuscript, the relationships among the composition, phase boundary and electrical properties can be well established. By designing a series of material systems of 0.95K0.40Na0.60NbO3–0.05Bi0.5M0.5HfO3 {M: Li, (Li, Na), (Li, K), (Li, Ag), (Li, Na, K), (Li, Ag, Na), (Li, Ag, K), (Li, Ag, Na, K), Ag, (Ag, Na), (Ag, K), (Ag, Na, K), Na, K, (Na, K)}, the orthorhombic–tetragonal (O–T) phase boundary can be well established and the enhanced d33 of 330–370 pC N−1 and a high TC of 308–320 °C can then be attained simultaneously in the ceramics without Li. In particular, there is also an improved temperature stability of d33 in KNN–BAH ceramics, i.e., a high d33 of 200 pC N−1 and d33* of 300 pm V−1 can be shown by the ceramics even if the measurement temperatures reach 150 °C. As a result, a balanced development of three parameters can be well realized in KNN–BMH ceramics and we believe that this material system will give a clear understanding about the comprehensive behaviors of KNN-based ceramics with a high TC.

Graphical abstract: Balanced development of piezoelectricity, Curie temperature, and temperature stability in potassium–sodium niobhrate lead-free ceramics

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Publication details

The article was received on 06 Aug 2016, accepted on 19 Sep 2016 and first published on 23 Sep 2016


Article type: Paper
DOI: 10.1039/C6TC03389J
Citation: J. Mater. Chem. C, 2016,4, 9779-9787
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    Balanced development of piezoelectricity, Curie temperature, and temperature stability in potassium–sodium niobhrate lead-free ceramics

    T. Zheng, W. Wu, J. Wu, J. Zhu and D. Xiao, J. Mater. Chem. C, 2016, 4, 9779
    DOI: 10.1039/C6TC03389J

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