Departmental Papers (MSE)

Document Type

Journal Article

Date of this Version

November 2008

Abstract

High density fine grain (1−x)BiScO3xPbTiO3 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 zx=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.

Comments

© 2008 American Institute of Physics. Reprinted from Applied Physics Letters, Volume 93, Issue 19, November 13, 2008, Article 192913.
Publisher URL: http://dx.doi.org/10.1063/1.2995861

Keywords

bismuth compounds, dielectric polarisations, electric domains, ferroelectric ceramics, ferroelectric transmissions, grain size, lead compounds, piezoceramics, piezoelectricity, scanning probe microscopy, sintering

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Date Posted: 11 December 2008

This document has been peer reviewed.