| Effect of LiSbO3 and SrZrO3 doping on the piezoelectric properties and microstructural behavior of K0.5Na0.5NbO3 ceramics |
| Wooseop Shin1, Sumi Kim1, Eunji Kim1, Dokyum Kim1, Seong-Uk Oh1, Jung-A Lee1, Young-Woo Heo1, Joon-Hyung Lee1, Sahn Nahm2 |
1School of Materials Science and Engineering, Kyungpook National University, Daegu, 41566, Korea
2Department of Materials Science and Engineering, Korea University, Seoul, 02841, Korea |
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Received: August 7, 2023; Revised: November 22, 2023 Accepted: December 6, 2023. Published online: January 18, 2024.
*Wooseop Shin and Sumi Kim contributed equally to this work. |
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| ABSTRACT |
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The effect of LiSbO3 and SrZrO3 doping on the piezoelectric characteristics of K0.5Na0.5NbO3-based ceramics was studied. First, (1 − x)K0.5Na0.5NbO3–xLiSbO3–CuO (0.00 ≤ x ≤ 0.07) was synthesized and a single phase of perovskite was observed in the range of 0.00 ≤ x ≤ 0.05. As LiSbO3 content increased, the orthorhombic single phase changed to orthorhombic and tetragonal multiphase. TO–T decreased from 176 °C (x = 0.00) to 85 ℃ (x = 0.05) and, the d33 showed the highest value of 156 pC/N (x = 0.05). Next, (0.95K0.5Na0.5NbO3–0.05LiSbO3)–xSrZrO3–CuO (0.00 ≤ x ≤ 0.05) was studied. All compositions were well synthesized as perovskite phases; orthorhombic and tetragonal mixed phases up to x = 0.02, rhombohedral, orthorhombic, and tetragonal mixed phases at x = 0.03 and 0.04; and rhombohedral and tetragonal phases at x = 0.05. TO–T decreased from 78 ℃ (x = 0.00) to 32 ℃ (x = 0.04), and TR–T was formed at 48 ℃ (x = 0.05). The d33 value at x = 0.04 was 288 pC/N and significantly reduced to 134 pC/N at x = 0.05. |
| Key words:
Lead-free piezoelectric ceramics · KNN-based · Doping · Phase transition · Piezoelectricity |
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