Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
10155479 | Journal of the European Ceramic Society | 2018 | 27 Pages |
Abstract
A morphotropic phase boundary (MPB) between rhombohedral (R) and tetragonal (T) phases was identified in a few (0.9-x)NaNbO3-0.1BaTiO3-xABO3 (xâ=â0-0.05) lead-free systems. Critical roles of R-phase inducers were specially evaluated in terms of phase boundary position, microstructure and piezoelectric responses. The results indicate not only the tolerance factor of the ABO3 additive but also its ferroelectricity and corresponding volume change would influence the formation of phase boundary and further determine dielectric and ferroelectric responses. The piezoelectric coefficient d33 of MPB compositions was compared with theoretically-calculated d33-cal according to d33â=â2Pr·ε33·Q33, demonstrating that the piezoelectric response of these systems should be determined by combined effects of the phase coexistence, nano-scale domains and particularly enhanced dielectric responses. The largest d33 â¼305 pC/N, the highest ε33T/εo â¼2815 and the lowest Pr â¼14.7 μC/cm2 were achieved in the MPB composition with 3.75% SrZrO3. These experimental results provide a valuable reference for designing new NaNbO3-based lead-free piezoelectric materials.
Related Topics
Physical Sciences and Engineering
Materials Science
Ceramics and Composites
Authors
He Qi, Ruzhong Zuo, Jing-feng Li, Longtu Li,