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Modulation of defects and electrical behaviors of Cu-doped KNN ceramics by fluorine–oxygen substitution

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Abstract

The lead-free piezoceramics of K0.5Na0.5Nb0.996Cu0.01O3−xFx (KNCNF-x) were synthesized via a conventional solid sintering process, and the inhibition effects of F–O substitution on the defect structures of oxygen vacancies and defect complexes were investigated. The KNCNF-0 ceramic without F doping has the highest level of oxygen vacancies and defect complexes. However, as the level of F increases, the contents of oxygen vacancies and defect complexes decrease correspondingly, and thus, the evolution of hardening to softening behaviors in the ceramics is observed. As a result, the KNCNF-0 piezoceramic shows extremely hardened electrical behaviors (a completely constricted PE hysteresis loop, large Ei of 10.7 kV cm−1, kp of 38%, d33 of 83 pC N−1, Qm of 3110, and tan δ of 0.2%), while the ceramic with x = 0.28 exhibits softened ferroelectric and piezoelectric characteristics (a non-shrinking PE hysteresis loop, declining Ei of 7.5 kV cm−1, enhanced kp of 42%, optimized d33 of 103 pC N−1, reduced Qm of 1031, and increased tan δ of 0.6%). This study provides new insights into the modulation of defects and electrical performance of KNN ceramics.

Graphical abstract: Modulation of defects and electrical behaviors of Cu-doped KNN ceramics by fluorine–oxygen substitution

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Supplementary files

Article information


Submitted
23 Oct 2019
Accepted
19 Dec 2019
First published
19 Dec 2019

Dalton Trans., 2020, Advance Article
Article type
Paper

Modulation of defects and electrical behaviors of Cu-doped KNN ceramics by fluorine–oxygen substitution

Y. Liao, D. Wang, H. Wang, L. Zhou, Q. Zheng and D. Lin, Dalton Trans., 2020, Advance Article , DOI: 10.1039/C9DT04133H

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