Dielectric and Piezoelectric Properties of Lead Free Na0.5K0.5NbO3–BiScO3 Ceramics

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概要

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• A well-known Bi-containing perovskite ferroelectric, BiScO3 (BS), was successfully utilized to develop Na0.5K0.5NbO3 (NKN)-based lead-free piezoelectric ceramics, in which there is a morphotropic phase boundary (MPB) between ferroelectric orthorhombic and rhombohedral phases. The addition of a small amount of BS tends to promote the sinterability of NKN ceramics, and simultaneously, to retard the grain growth, and change the crystalline structures, resulting in a dense ($1-x$)NKN–$x$BS solid-solution ceramic upon conventional sintering. Enhanced piezoelectric and electromechanical properties appear near the MPB composition with $x=0.02$, the piezoelectric constant being 210 pC/N and the planar electromechanical coupling factor being 45%. This material also has a comparable Curie temperature (340 °C) to that of commercial Pb(Zr,Ti)O3 as well. All these results reveal that BS-substituted NKN ceramics may become promising candidates for lead-free piezoelectric materials.

• 2007-10-15

著者

• Ye Chun

  School of Materials Science and Engineering, Hefei University of Technology, Hefei 230009, P. R. China

• Zuo Ruzhong

  School of Materials Science and Engineering, Hefei University of Technology, Hefei 230009, P. R. China

• Fang Xusheng

  School of Materials Science and Engineering, Hefei University of Technology, Hefei 230009, P. R. China

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• Dielectric and Piezoelectric Properties of Lead Free Na0.5K0.5NbO3–BiScO3 Ceramics

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