Effect of LiSbO₃ and SrZrO₃ doping on the piezoelectric properties and microstructural behavior of K_0.5Na_0.5NbO₃ ceramics

초록

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-xLiSbO(3)-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 degrees C (x = 0.00) to 85 degree celsius (x = 0.05) and, the d(33) showed the highest value of 156 pC/N (x = 0.05). Next, (0.95K(0.5)Na(0.5)NbO(3)-0.05LiSbO(3))-xSrZrO(3)-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 degree celsius (x = 0.00) to 32 degree celsius (x = 0.04), and TR-T was formed at 48 degree celsius (x = 0.05). The d(33) value at x = 0.04 was 288 pC/N and significantly reduced to 134 pC/N at x = 0.05.

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