Structural and Piezoelectric Properties of (Na_1−xK_x)NbO₃ Platelets and Their Application for Piezoelectric Nanogenerator

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• 作者：HaiBo Xu ; Young-Jin Ko ; Tae-Gon Lee ; Su-Jin Park ; Myoung-Sub Noh ; Bo-Yun Kim ; Jeong Seog Kim and Sahn Nahm
• 刊名：Journal of the American Ceramic Society
• 出版年：2016
• 出版时间：October 2016
• 年：2016
• 卷：99
• 期：10
• 页码：3476-3484
• 全文大小：1971K
• ISSN：1551-2916

文摘

(Na_1−xK_x)NbO₃ (NKN) platelets synthesized at 600°C for 12 h have an Amm2 orthorhombic structure. However, the structure of NKN platelets synthesized at 500°C is a mixture of R3m rhombohedral and Amm2 orthorhombic structures. The formation of a rhombohedral structure is attributed to the presence of OH⁻ and H₂O defects in the NKN platelets. The piezoelectric strain constant (d₃₃) of NKN platelets synthesized at 600°C for 12 h is 100 pmV⁻¹, whereas that of NKN platelets synthesized at 500°C is lesser (50 pmV⁻¹) due to the presence of these defects. Piezoelectric nanogenerators (PNGs) are fabricated using composites consisting of NKN platelets and polydimethylsiloxane. A large output voltage of 25 V and output current of 2.7 μA were obtained for the PNG with NKN platelets synthesized at 600°C for 6 h. This PNG shows a high output electrical energy of 3.0 μW at an external load of 5.1 MΩ.