Abstract
A homogeneous KNbO3 (KN) phase was formed in specimens that were sintered at 1020°C and 1040°C, without formation of the K2O-deficient secondary phase, indicating that the amount of evaporation of K2O during sintering was very small. However, the KN liquid phase was formed during sintering and assisted the densification of the KN ceramics. A dense microstructure was developed in the specimen sintered at 1020°C for 6h and abnormal grain growth occurred in this specimen. A similar microstructure was observed in the specimens sintered at 1040°C for 1.0h. The dielectric and piezoelectric properties of the KN ceramics were considerably influenced by the relative density. The KN ceramics sintered at 1020°C for 6h, which showed a large relative density that was 95% of the theoretical density, exhibited promising electrical properties: e{open}T33/e{open}o of 540, d33 of 109pC/N, kp of 0.29, and Qm of 197.
Original language | English |
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Pages (from-to) | 4193-4200 |
Number of pages | 8 |
Journal | Journal of the European Ceramic Society |
Volume | 34 |
Issue number | 16 |
DOIs | |
Publication status | Published - 2014 |
Keywords
- KNbO
- Lead-free piezoelectric ceramics
- Liquid phase sintering
ASJC Scopus subject areas
- Ceramics and Composites
- Materials Chemistry