Microstructural origin for the piezoelectricity evolution in (K0.5Na0.5)NbO3-based lead-free ceramics

Guo, Hanzheng; Zhang, Shujun; Tan, Xiaoli; Beckman, Scott; Tan, Xiaoli

Microstructural origin for the piezoelectricity evolution in (K0.5Na0.5)NbO3-based lead-free ceramics

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2013_GuoH_MicrostructuralOriginPiezoelectricity.pdf (2.74 MB)

Date

2013-10-15

Authors

Guo, Hanzheng

Zhang, Shujun

Tan, Xiaoli

Beckman, Scott

Tan, Xiaoli

Authors

Person

Tan, Xiaoli

Professor

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Organizational Unit

Materials Science and Engineering

Materials engineers create new materials and improve existing materials. Everything is limited by the materials that are used to produce it. Materials engineers understand the relationship between the properties of a material and its internal structure — from the macro level down to the atomic level. The better the materials, the better the end result — it’s as simple as that.

Department

Materials Science and Engineering

Abstract

Chemically modified (K0.5 Na 0.5)NbO3 compositions with finely tuned polymorphic phase boundaries (PPBs) have shown excellent piezoelectric properties. The evolution of the domain morphology and crystal structure under applied electric fields of a model material, 0.948(K0.5Na 0.5)NbO3–0.052LiSbO3, was directly visualized using in situ transmission electron microscopy. The in situ observations correlate extremely well with measurements of the electromechanical response on bulk samples. It is found that the origin of the excellentpiezoelectric performance in this lead-free composition is due to a tilted monoclinic phase that emerges from the PPB when poling fields greater than 14 kV/cm are applied.

Comments

The following article appeared in Journal of Applied Physics 114 (2013): 154102 and may be found at http://dx.doi.org/10.1063/1.4825213.

Copyright

Tue Jan 01 00:00:00 UTC 2013

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