Bulk dense fine-grain (1-x)BiScO{sub 3}-xPbTiO{sub 3} ceramics with high piezoelectric coefficient
- State Key Laboratory of New Ceramics and Fine Processing, Department of Materials Science and Engineering, Tsinghua University, Beijing 100084 (China)
- Department of Materials Science and Engineering, University of Pennsylvania, Philadelphia, Pennsylvania 19104-5272 (United States)
High density fine grain (1-x)BiScO{sub 3}-xPbTiO{sub 3} ceramics were successfully prepared by two-step sintering and their ferroelectric properties were investigated. Experimental evidence indicates the existence of a morphotropic phase boundary at the composition x=0.635, which exhibits a piezoelectric coefficient d{sub 33} of 700 pC/N at room temperature, significantly higher than the reported values to date. Furthermore, a higher electromechanical coupling factor Kp=0.632 and a larger remnant polarization P{sub r}=47.3 {mu}C/cm{sup 2} were obtained. The paraelectric-to-ferroelectric phase transition occurs at 446 deg. C, slightly lower than in the coarse grain ceramics with a similar composition, suggesting a grain size effect. The local effective piezoelectric coefficient d{sub 33}* was estimated to be 795 pC/N at 2.29 V, measured by scanning probe microscopy. Further atomic force microscope observation revealed the existence of 90 deg. domains of about 60-70 nm in width, confirming the previous results that small domain structure enhances the piezoelectric properties.
- OSTI ID:
- 21175752
- Journal Information:
- Applied Physics Letters, Journal Name: Applied Physics Letters Journal Issue: 19 Vol. 93; ISSN APPLAB; ISSN 0003-6951
- Country of Publication:
- United States
- Language:
- English
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