Study of Lead-free Ceramics of the [(K0.5Na0.5) 0.94Li 0.06] 0.97La0.01(Nb0.9Ta0.1)O3 Piezoelectric Composite
[(K0.5Na0.5)0.94Li0.06]0.97La0.01(Nb0.9Ta0.1)O3 lead-free ceramics have been prepared by the traditional ceramic method. The calcined powders were encapsulated and sintered in their own atmosphere. Our results reveal that Li+, La3+ and Ta5+ diffuse into the (K0.5Na0.5)NbO3 lattice to form a solid solution with a perovskite structure. X-ray diffraction analysis showed a mixture of phases with a predominant orthorombic structure. The dielectric properties plotted vs temperature show a normal phase transition at 399oC. The piezoelectric behavior is characterized by the values of kp= 0.34, Qm=137 and εmax=1906, allowing us to conclude that a substitute for PZT ceramics is within reach.
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