Please use this identifier to cite or link to this item: http://hdl.handle.net/10397/5597
Title: Antiferroelectric-like properties and enhanced polarization of Cu-doped K₀.₅Na₀.₅NbO₃ piezoelectric ceramics
Authors: Ke, S
Huang, H 
Fan, H
Lee, HK
Zhou, L 
Mai, YW
Issue Date: 20-Aug-2012
Source: Applied physics letters, 20 Aug. 2012, v. 101, no. 8, 082901, p. 1-4
Abstract: Abnormal evolution of ferroelectric hysteresis (P-E) loops was observed in Cu-doped K₀.₅Na₀.₅NbO₃ (KNN) ceramics. The 1 mol. % Cu-doped fresh sample exhibited double-loop-like characteristics, while the 1.5 and 2 mol. % Cu-doped KNN ceramics showed normal single loops. Electron paramagnetic resonance spectra verified the formation of non-switchable (Cu[sub Nb]‴−V[sub O]••) ′ (DC1) and non-polar (V[sub O]••−Cu [sub Nb]‴−V[sub O]••)• (DC2) defect complexes in these ceramics. According to the experimental results, it is suggested that DC1 would provide the driving force for domain back-switching, leading to the double P-E loops, while DC2 would contribute to the space charges. Dielectric aging behaviors of the samples also supported this mechanism. It is the competition between the DC1 and DC2 defect complexes that induced the observed compositional evolution of P-E loops in the Cu-doped KNN ceramics.
Keywords: Ageing
Antiferroelectric materials
Copper
Dielectric hysteresis
Dielectric polarisation
Ferroelectric switching
Paramagnetic resonance
Piezoceramics
Potassium compounds
Sodium compounds
Space charge
Publisher: American Institute of Physics
Journal: Applied physics letters 
ISSN: 0003-6951
EISSN: 1077-3118
DOI: 10.1063/1.4747212
Rights: © 2012 American Institute of Physics. This article may be downloaded for personal use only. Any other use requires prior permission of the author and the American Institute of Physics. The following article appeared in S. M. Ke et al., Appl. Phys. Lett. 101, 082901 (2012) and may be found at http://link.aip.org/link/?apl/101/082901
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