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 journalArticle

11 Scopus citations

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.

Original languageEnglish (US)
Pages (from-to)3120-3126
Number of pages7
JournalJournal of the American Ceramic Society
Volume96
Issue number10
DOIs
StatePublished - Oct 1 2013

All Science Journal Classification (ASJC) codes

  • Ceramics and Composites
  • Materials Chemistry

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