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}T 33/e{open}o of 540, d33 of 109pC/N, kp of 0.29, and Qm of 197.
| Original language | English |
|---|---|
| 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 |
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Keywords
- KNbO
- Lead-free piezoelectric ceramics
- Liquid phase sintering
ASJC Scopus subject areas
- Ceramics and Composites
- Materials Chemistry
Cite this
Influence of sintering conditions on piezoelectric properties of KNbO3 ceramics. / Kim, Dae Hyeon; Joung, Mi Ri; Seo, In Tae; Hur, Joon; Kim, Jong Hyun; Kim, Bo Yun; Lee, Hwack Joo; Nahm, Sahn.
In: Journal of the European Ceramic Society, Vol. 34, No. 16, 2014, p. 4193-4200.Research output: Contribution to journal › Article
}
TY - JOUR
T1 - Influence of sintering conditions on piezoelectric properties of KNbO3 ceramics
AU - Kim, Dae Hyeon
AU - Joung, Mi Ri
AU - Seo, In Tae
AU - Hur, Joon
AU - Kim, Jong Hyun
AU - Kim, Bo Yun
AU - Lee, Hwack Joo
AU - Nahm, Sahn
PY - 2014
Y1 - 2014
N2 - 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}T 33/e{open}o of 540, d33 of 109pC/N, kp of 0.29, and Qm of 197.
AB - 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}T 33/e{open}o of 540, d33 of 109pC/N, kp of 0.29, and Qm of 197.
KW - KNbO
KW - Lead-free piezoelectric ceramics
KW - Liquid phase sintering
UR - http://www.scopus.com/inward/record.url?scp=84924077895&partnerID=8YFLogxK
UR - http://www.scopus.com/inward/citedby.url?scp=84924077895&partnerID=8YFLogxK
U2 - 10.1016/j.jeurceramsoc.2014.06.028
DO - 10.1016/j.jeurceramsoc.2014.06.028
M3 - Article
AN - SCOPUS:84924077895
VL - 34
SP - 4193
EP - 4200
JO - Journal of the European Ceramic Society
JF - Journal of the European Ceramic Society
SN - 0955-2219
IS - 16
ER -