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As a candidate for lead-free piezoelectric materials, Li2O excess 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. Abnormal grain growth in NKN-5LT ceramics was observed with varying Li2O content. In the 1 mol% Li2O excess NKN-5LT samples sintered at 1000°C for 4 h in air, electromechanical...