(Na,K)NbO₃-CaCu₃Ti₄O₁₂ perovskite composites for supercapacitor based piezoelectric devices

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• 作者：Jae-Hoon Ji ; Ji-Won Lee ; Hyunsoo Chung ; Jung-Hyuk Koh ; ^{jhkoh@cau.ac.kr" class="auth_mail" title="E-mail the corresponding author}
• 关键词：Lead-free piezoelectric ; Sintering temperature ; Energy harvesting
• 刊名：Ceramics International
• 出版年：2016
• 出版时间：March 2016
• 年：2016
• 卷：42
• 期：4
• 页码：4978-4983
• 全文大小：1295 K

文摘

The supercapacitor based piezoelectric material composite (Na,K)NbO₃–CaCu₃Ti₄O₁₂ (NKN–CCTO) is investigated for possible application in piezoelectric devices. (1−x)NKN–xCCTO (0.015≤x≤0.06) with different sintering conditions is researched for supercapacitor based piezoelectric applications. The 0.94NKN–0.06CCTO composite sintered at 975 °C shows the highest dielectric permittivity of 796. Clear SEM images of (1−x)NKN–xCCTO reveal that these compositions have high density well-crystallized structures. The composition and sintering temperature dependence of dielectric permittivities and piezoelectric coefficients, plotted in three dimensions, show that the 0.985NKN–0.015CCTO composite sintered at 1025 °C has a moderate dielectric permittivity of 405 and a piezoelectric constant of 98 pC/N.