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https://doi.org/10.3938/NPSM.70.7
Enhanced Piezoelectric Effect and Crystallographic Lattice of Ta Modified (Na$ _{0.53}$K$ _{0.47}$Li$ _{0.03}$)NbO$ _{3}$ Ceramics with Different Sintering Temperature
New Phys.: Sae Mulli 2020; 70: 7~11
Published online January 31, 2020;  https://doi.org/10.3938/NPSM.70.7
© 2020 New Physics: Sae Mulli.

Ho Sueb LEE, Jin Soo KIM*

Department of Physics, Changwon National University, Gyeongnam 51140, Korea
Correspondence to: kimjjin@changwon.ac.kr
Received October 5, 2019; Revised December 5, 2019; Accepted December 16, 2019.
cc This is an open-access article distributed under the terms of the Creative Commons Attribution Non-Commercial License (http://creativecommons.org/licenses/by-nc/3.0/) which permits unrestricted non-commercial use, distribution, and reproduction in any medium, provided the original work is properly cited.
Abstract
To improve the piezoelectric properties, we prepared 20 mol\% Ta-substitued (Na$ _{0.53}$K $ _{0.47}$Li$ _{0.03}$)NbO$ _{3}$ ceramics with different sintering temperatures from 1050 $ ^{\circ}$C to 1150 $ ^{\circ}$C. The piezoelectric properties of the NKLNT ceramics were enhanced for the sintering temperature of $\sim$1080 $ ^{\circ}$C. The Miller index of the sintered NKLNT ceramics was decided by experimental XRD data and theoretic equation. Lattice constant $a$, $b$ and $c$ in orthorhombic system and cell volume were calculated using Cohen's least square method. We found that the NKLNT ceramics sintered at a proper temperature exhibited enhanced piezoelectric properties and increased lattice constants. Furthermore, we discussed that the enhanced piezoelectric properties are related to the crystallographic lattice in the ABO$ _{3}$ perovskite structure.
PACS numbers: 77.22.-d, 77.84.Dy, 77.84.-s
Keywords: (Na$ _{0.5}$K$ _{0.5}$)NbO$ _{3}$, NKN, Lead-free, Dielectric, Piezoelectric, Phase transition, Ta ion addition


January 2020, 70 (1)
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