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.
All Science Journal Classification (ASJC) codes
- Ceramics and Composites
- Materials Chemistry