Polymorphic phase transition and excellent piezoelectric performance of (K0.55Na0.45)0.965Li0.035Nb0.80Ta0.20O3 lead-free ceramics

Zhang, J. L.; Zong, X. J.; Wu, L.; Gao, Y.; Zheng, P.; Shao, S. F.
July 2009
Applied Physics Letters;7/13/2009, Vol. 95 Issue 2, p022909
Academic Journal
A lead-free ceramic with the composition (K0.55Na0.45)0.965Li0.035Nb0.80Ta0.20O3 was found having an outstanding piezoelectric performance. It possesses high piezoelectric properties of d33=262 pC/N, kp=0.53, k33=0.63, and k31=0.31 with [variant_greek_epsilon]′=1290 and tan δ=0.019 at room temperature. In spite of the orthorhombic-tetragonal polymorphic phase transition around 30 °C, temperature stability of the electromechanical coupling coefficients is very good over the common usage temperature interval between -40 and 85 °C. Furthermore, the piezoelectric properties remain almost unchanged in the severe thermal aging test down to -150 °C and up to about 300 °C. It is suggested that the outstanding piezoelectric performance of this ceramic can be largely ascribed to the phase coexistence in a wide temperature range and the Ta-rich composition.


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