Bulk dense fine-grain (1-x)BiScO3–xPbTiO3 ceramics with high piezoelectric coefficient

Tingting Zou; Xiaohui Wang; Han Wang; Caifu Zhong; Longtu Li; I-Wei Chen
November 2008
Applied Physics Letters;11/10/2008, Vol. 93 Issue 19, p192913
Academic Journal
High density fine grain (1-x)BiScO3–xPbTiO3 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 d33 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 Pr=47.3 μC/cm2 were obtained. The paraelectric-to-ferroelectric phase transition occurs at 446 °C, slightly lower than in the coarse grain ceramics with a similar composition, suggesting a grain size effect. The local effective piezoelectric coefficient d33* 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° domains of about 60–70 nm in width, confirming the previous results that small domain structure enhances the piezoelectric properties.


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