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Structural and Piezoelectric Properties of (Na1−xKx)NbO3 Platelets and Their Application for Piezoelectric Nanogenerator

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(Na1−x K 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 (d 33) 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.
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Keywords: NKN platelet; lead‐free piezoelectric materials; piezoelectric nanogenerators

Document Type: Research Article

Publication date: October 1, 2016

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