Structural and Piezoelectric Properties of (Na1−xKx)NbO3 Platelets and Their Application for Piezoelectric Nanogenerator. Issue 10 (29th June 2016)

• Record Type: Journal Article
• Authors: Xu, HaiBo; Ko, Young‐Jin; Lee, Tae‐Gon; Park, Su‐Jin; Noh, Myoung‐Sub; Kim, Bo‐Yun; Kim, Jeong Seog; Nahm, Sahn
• Editors: Brennecka, G.
• Is Part Of: Journal of the American Ceramic Society. Volume 99:Issue 10(2016)
• Page Start: 3476
• Page End: 3484
• Publication Date: 2016-06-29
• Subjects: NKN platelet -- lead‐free piezoelectric materials -- piezoelectric nanogenerators; Ceramics -- Periodicals; 620.1405
• DOI: 10.1111/jace.14382
• Languages: English
• ISSNs: 0002-7820

Abstract

Abstract : (Na1− x K x )NbO3 (NKN) platelets synthesized at 600°C for 12 h have an Amm 2 orthorhombic structure. However, the structure of NKN platelets synthesized at 500°C is a mixture of R 3 m rhombohedral and Amm 2 orthorhombic structures. The formation of a rhombohedral structure is attributed to the presence of OH − and H2 O 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.