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Structural and piezoelectric properties of MnO2-doped PZT-PSN ceramics for ultrasonic vibrator

Authors
Cha, Y.-J.Kim, C.-I.Kim, K.-J.Jeong, Y.-H.Lee, Y.-J.Lee, H.Paik, J.-H.
Issue Date
2009
Keywords
Ceramic; MPB; Piezoelectric; Ultrasonic; Vibrator
Citation
Korean Journal of Materials Research, v.19, no.4, pp.198 - 202
Indexed
SCOPUS
KCI
Journal Title
Korean Journal of Materials Research
Volume
19
Number
4
Start Page
198
End Page
202
URI
https://scholar.korea.ac.kr/handle/2021.sw.korea/121844
DOI
10.3740/MRSK.2009.19.4.198
ISSN
1225-0562
Abstract
For use in ultrasonic actuators, we investigated the structural and piezoelectric properties of (1 - x)Pb(Zr0.515 Ti0.485)O3 - xPb(Sb1/2 Nb1/2)O3 + 0.5 wt‰ MnO2 [(1 - x)PZT - xPSN + MnO2] ceramics with a variation of x (x = 0.02, 0.04, 0.06, 0.08). All the ceramics, which were sintered at 1250°C for 2 h, showed a typical perovskite structure, implying that they were well synthesized. A homogeneous micro structure was also developed for the specimens, and their average grain size was slightly decreased to 1.3 μm by increasing x to 0.8. Moreover, a second phase with a pyrochlore structure appeared when x was above 0.06, which resulted in the deterioration of their piezoelectric properties. However, the 0.96PZT-0.04PSN + MnO2 ceramics, which corresponds with a morphotropic phase boundary (MPB) composition in the (1 - x)PZT - xPSN + MnO2 system, exhibited good piezoelectric properties: a piezoelectric constant (d33) of 325 pC/N, an electromechanical coupling factor (kp) of 70.8%, and a mechanical quality factor (Qm) of 1779. The specimens with a relatively high curie temperature (Tc) of 305°C also showed a significantly high dielectric constant (εr) value of 1109. Therefore, the 0.96PZT - 0.04PSN + MnO2 ceramics are suitable for use in ultrasonic vibrators.
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