Antiferroelectric-like properties and enhanced polarization of Cu-doped K0.5Na0.5NbO3piezoelectric ceramics

S. M. Ke; Haitao Huang; H. Q. Fan; H. K. Lee; Li Min Zhou; Y. W. Mai

doi:10.1063/1.4747212

Antiferroelectric-like properties and enhanced polarization of Cu-doped K_0.5Na_0.5NbO₃piezoelectric ceramics

S. M. Ke, Haitao Huang, H. Q. Fan, H. K. Lee, Li Min Zhou, Y. W. Mai

Research output: Journal article publication › Journal article › Academic research › peer-review

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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‴Nb- VȮ̇)′ (DC1) and non-polar (VȮ̇- Cu‴Nb- VȮ̇)̇(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.

Original language	English
Article number	082901
Journal	Applied Physics Letters
Volume	101
Issue number	8
DOIs	https://doi.org/10.1063/1.4747212
Publication status	Published - 20 Aug 2012

ASJC Scopus subject areas

Physics and Astronomy (miscellaneous)

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10.1063/1.4747212

http://hdl.handle.net/10397/5597

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title = "Antiferroelectric-like properties and enhanced polarization of Cu-doped K0.5Na0.5NbO3piezoelectric ceramics",

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‴Nb- V{\.O}̇)′ (DC1) and non-polar (V{\.O}̇- Cu‴Nb- V{\.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.",

author = "Ke, {S. M.} and Haitao Huang and Fan, {H. Q.} and Lee, {H. K.} and Zhou, {Li Min} and Mai, {Y. W.}",

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T1 - Antiferroelectric-like properties and enhanced polarization of Cu-doped K0.5Na0.5NbO3piezoelectric ceramics

AU - Ke, S. M.

AU - Huang, Haitao

AU - Fan, H. Q.

AU - Lee, H. K.

AU - Zhou, Li Min

AU - Mai, Y. W.

PY - 2012/8/20

Y1 - 2012/8/20

N2 - 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‴Nb- VȮ̇)′ (DC1) and non-polar (VȮ̇- Cu‴Nb- VȮ̇)̇(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.

AB - 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‴Nb- VȮ̇)′ (DC1) and non-polar (VȮ̇- Cu‴Nb- VȮ̇)̇(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.

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Antiferroelectric-like properties and enhanced polarization of Cu-doped K_0.5Na_0.5NbO₃piezoelectric ceramics

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