Abstract
ABSTRACT As a candidate for lead-free piezoelectric materials, dense 0.95(Na0.5K0.5)NbO3-0.05LiTaO3 (NKN-5LT) ceramics were developed by conventional sintering process. Sintering temperature was lowered by adding Li2O as a sintering aid. Grain growth behaviors with Li2O addition were explained in terms of the effect of Li2O on interface reaction—controlled grain growth and the critical driving force. The electrical properties of NKN-5LT ceramics were investigated as a function of Li2O concentration., Excellent piezoelectric and electromechanical responses, d33∼ 250 pC/N, k P ∼ 0.37, were obtained for 1 mol% Li2O excess NKN-5LT samples sintered at 1000°C for 4 h in air.
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