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Dielectric Dispersion and Ferroelectric P-E Hysteresis Loop of Lead-Free Ta-Substituted (Na$_{0.53}$K$_{0.47}$)(Nb$_{0.55}$Ta$_{0.45}$)O$_3$ Ceramics
New Phys.: Sae Mulli 2017; 67: 1284~1290
Published online November 30, 2017;
© 2017 New Physics: Sae Mulli.

Jin Soo KIM1, Hyo-Eun KIM1, Ho Sueb LEE*1, Kwang-Sei LEE2

1 Department of Physics and Center for Research Facilities, Changwon National University, Changwon 51140, Korea
2 Department of Nano Science & Engineering and Center for Nano Manufacturing, Inje University, Gimhae 50834, Korea
Correspondence to:
Received August 16, 2017; Revised September 18, 2017; Accepted September 27, 2017.
cc This is an open-access article distributed under the terms of the Creative Commons Attribution Non-Commercial License ( which permits unrestricted non-commercial use, distribution, and reproduction in any medium, provided the original work is properly cited.
Ta-substituted (Na$_{0.53}$K$_{0.47}$)(Nb$_{0.55}$Ta$_{0.45}$)O$_3$ (NKNT) ceramics were prepared by using a solid-state reaction method. We studied the dielectric response and the ferroelectric P-E hysteresis loop. The $T_{O-T}$ (orthorhombic-tetragonal) and $T_c$ (tetragonal-cubic) phase transitional temperatures decreased, and the piezoelectric properties of NKNT were enhanced. In addition, the low-frequency dispersion decreased, and the ferroelectric P-E hysteresis loops became saturated. We discuss the low-frequency dielectric response and the ferroelectric properties related to the formation of defects, as well as the contribution of charge carriers.
PACS numbers: 77.22.-d, 77.84.Dy, 77.84.-s
Keywords: (Na$_{0.5}$K$_{0.5}$)NbO$_3$, Dielectric, Lead-free, Ferroelectric

November 2017, 67 (11)
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