Effect of LiSbO3 and SrZrO3 doping on the piezoelectric properties and microstructural behavior of K0.5Na0.5NbO3 ceramics
Journal of the Korean Ceramic Society(2024)
摘要
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.
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关键词
Lead-free piezoelectric ceramics,KNN-based,Doping,Phase transition,Piezoelectricity
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