Effect of Na₂O additions on the sinterability and piezoelectric properties of lead-free 95(Na_0.5K_0.5)NbO₃–5LiTaO₃ ceramics

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• 作者：Min-Soo Kim ; Dae-Su Lee ; Eon-Cheol Park ; Soon-Jong Jeong ; Jae-Sung Song
• 关键词：Sintering ; Microstructure ; Piezoelectric properties ; Niobates ; Tantalates
• 刊名：Journal of the European Ceramic Society
• 出版年：2007
• 期刊代码：53_09552219
• 类别：ms
• 出版时间：2007
• 卷：27
• 期：13-15
• 页码：4121-4124
• 文件大小：565 K

摘要

As a candidate for lead-free piezoelectric materials, Na₂O excess 95(Na_0.5K_0.5)NbO₃–5LiTaO₃ (NKN–5LT) ceramics were developed by conventional sintering process. Sintering temperature was lowered by adding Na₂O as a sintering aid. Abnormal grain growth in NKN–5LT ceramics was observed with varying Na₂O contents. This grain growth behavior was explained in terms of interface reaction-controlled nucleation and growth. The electrical properties of NKN–5LT ceramics were investigated as a function of Na₂O concentration. In the 1 mol%Na₂O excess NKN–5LT samples sintered at 1050 °C for 4 h in air, electromechanical coupling factor and piezoelectric constant of NKN–5LT ceramics were found to reach the highest values of 0.43 and 230 pC/N, respectively.