About this Abstract |
| Meeting |
MS&T24: Materials Science & Technology
|
| Symposium
|
The American Ceramic Society Journal Awards Symposium
|
| Presentation Title |
Significantly Enhancement of Piezoelectric Properties and Electrical Resistivity in Bismuth Titanate-Ferrite |
| Author(s) |
Qian Wang, Chun-Ming Wang |
| On-Site Speaker (Planned) |
Qian Wang |
| Abstract Scope |
Bismuth titanate-ferrite (Bi5Ti3FeO15) has received extensive attention for high-temperature applications due to the high Curie temperature of ~760 ℃. However, the piezoelectric properties of BTF have not been sufficiently studied yet; in addition, its low electrical resistivity at elevated temperatures limit high-temperature piezoelectric applications. In our work, a large piezoelectric constant of ~25 pC/N can be achieved in Bi5Ti3FeO15 that prepared by solid-state sintering method through composition substitution, which is over three times larger than that of prototype Bi5Ti3FeO15. Meanwhile, the dc electrical resistivity of BTF can be significantly enhanced by B-site transition mental element substitutions with lager valence state compared with that of Ti4+. On the other hand, the piezoelectric constant of Bi5Ti3FeO15 can be further improved to ~40 pC/N by optimizing the preparation process with grain-orientation techniques, such as spark plasma sintering method. These results suggest that Bi5Ti3FeO15 has promising potential for high-temperature piezoelectric applications. |