Enhancement of piezoelectric performance of lead-free NKN-based ceramics via a high-performance Flux - NaF - Nb2 O5

Cheng Liu; Peng Liu; Keisuke Kobayashi; Wei Guo Qu; Clive A. Randall

doi:10.1111/jace.12461

Enhancement of piezoelectric performance of lead-free NKN-based ceramics via a high-performance Flux - NaF - Nb₂ O₅

Cheng Liu, Peng Liu, Keisuke Kobayashi, Wei Guo Qu, Clive A. Randall

Research output: Contribution to journal › Article › peer-review

16 Scopus citations

Abstract

x(NaF-0.5Nb₂O₅)-(1 - x)[(Na_0.5K _0.5)(Nb_0.8Ta_0.2)O₃] (100xNN-NKNT) piezoelectric ceramics were fabricated to high densities above 97% when sintering at temperatures ~1200°C. Compared with pure (Na,K)NbO₃ (NKN), dielectric constants of the NaF-Nb₂O₅ flux-doped NKNT ceramics were increased whereas dielectric losses remained low. High field polarization switching showed very square hysteresis loops, but the coercive fields were decreased through a "softening" doping effect induced by the flux. A Rayleigh analysis inferred that the extrinsic contribution from the domain wall dynamics was increased with the flux addition. Collectively, all the experimental observations suggested that NaF-Nb₂O₅ was, in part, soluble in the structure and highly suitable for obtaining a stable NKN system with improved piezoelectric performance.

Original language	English (US)
Pages (from-to)	3120-3126
Number of pages	7
Journal	Journal of the American Ceramic Society
Volume	96
Issue number	10
DOIs	https://doi.org/10.1111/jace.12461
State	Published - Oct 2013

All Science Journal Classification (ASJC) codes

Ceramics and Composites
Materials Chemistry

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title = "Enhancement of piezoelectric performance of lead-free NKN-based ceramics via a high-performance Flux - NaF - Nb2 O5",

abstract = "x(NaF-0.5Nb2O5)-(1 - x)[(Na0.5K 0.5)(Nb0.8Ta0.2)O3] (100xNN-NKNT) piezoelectric ceramics were fabricated to high densities above 97% when sintering at temperatures ~1200°C. Compared with pure (Na,K)NbO3 (NKN), dielectric constants of the NaF-Nb2O5 flux-doped NKNT ceramics were increased whereas dielectric losses remained low. High field polarization switching showed very square hysteresis loops, but the coercive fields were decreased through a {"}softening{"} doping effect induced by the flux. A Rayleigh analysis inferred that the extrinsic contribution from the domain wall dynamics was increased with the flux addition. Collectively, all the experimental observations suggested that NaF-Nb2O5 was, in part, soluble in the structure and highly suitable for obtaining a stable NKN system with improved piezoelectric performance.",

author = "Cheng Liu and Peng Liu and Keisuke Kobayashi and Qu, {Wei Guo} and Randall, {Clive A.}",

year = "2013",

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doi = "10.1111/jace.12461",

language = "English (US)",

volume = "96",

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T1 - Enhancement of piezoelectric performance of lead-free NKN-based ceramics via a high-performance Flux - NaF - Nb2 O5

AU - Liu, Cheng

AU - Liu, Peng

AU - Kobayashi, Keisuke

AU - Qu, Wei Guo

AU - Randall, Clive A.

PY - 2013/10

Y1 - 2013/10

N2 - x(NaF-0.5Nb2O5)-(1 - x)[(Na0.5K 0.5)(Nb0.8Ta0.2)O3] (100xNN-NKNT) piezoelectric ceramics were fabricated to high densities above 97% when sintering at temperatures ~1200°C. Compared with pure (Na,K)NbO3 (NKN), dielectric constants of the NaF-Nb2O5 flux-doped NKNT ceramics were increased whereas dielectric losses remained low. High field polarization switching showed very square hysteresis loops, but the coercive fields were decreased through a "softening" doping effect induced by the flux. A Rayleigh analysis inferred that the extrinsic contribution from the domain wall dynamics was increased with the flux addition. Collectively, all the experimental observations suggested that NaF-Nb2O5 was, in part, soluble in the structure and highly suitable for obtaining a stable NKN system with improved piezoelectric performance.

AB - x(NaF-0.5Nb2O5)-(1 - x)[(Na0.5K 0.5)(Nb0.8Ta0.2)O3] (100xNN-NKNT) piezoelectric ceramics were fabricated to high densities above 97% when sintering at temperatures ~1200°C. Compared with pure (Na,K)NbO3 (NKN), dielectric constants of the NaF-Nb2O5 flux-doped NKNT ceramics were increased whereas dielectric losses remained low. High field polarization switching showed very square hysteresis loops, but the coercive fields were decreased through a "softening" doping effect induced by the flux. A Rayleigh analysis inferred that the extrinsic contribution from the domain wall dynamics was increased with the flux addition. Collectively, all the experimental observations suggested that NaF-Nb2O5 was, in part, soluble in the structure and highly suitable for obtaining a stable NKN system with improved piezoelectric performance.

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Enhancement of piezoelectric performance of lead-free NKN-based ceramics via a high-performance Flux - NaF - Nb₂ O₅

Abstract

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