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Microstructural origin for the piezoelectricity evolution in (K0.5Na0.5)NbO3-based lead-free ceramics
Journal of Applied Physics
  • Hanzheng Guo, Iowa State University
  • Shujun Zhang, Pennsylvania State University
  • Scott P. Beckman, Iowa State University
  • Xiaoli Tan, Iowa State University
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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.

The following article appeared in Journal of Applied Physics 114 (2013): 154102 and may be found at

Copyright 2013 American Institute of Physics. This article may be downloaded for personal use only. Any other use requires prior permission of the author and the American Institute of Physics.
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American Institute of Physics
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Hanzheng Guo, Shujun Zhang, Scott P. Beckman and Xiaoli Tan. "Microstructural origin for the piezoelectricity evolution in (K0.5Na0.5)NbO3-based lead-free ceramics" Journal of Applied Physics Vol. 114 (2013) p. 154102
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