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

Hai Bo Xu, Young Jin Ko, Tae Gon Lee, Su Jin Park, Myoung Sub Noh, Bo Yun Kim, Jeong Seog Kim, Sahn Nahm, G. Brennecka

Research output: Contribution to journalArticlepeer-review

6 Citations (Scopus)

Abstract

(Na1−xKx)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.

Original languageEnglish
Pages (from-to)3476-3484
Number of pages9
JournalJournal of the American Ceramic Society
Volume99
Issue number10
DOIs
Publication statusPublished - 2016 Oct 1

Keywords

  • NKN platelet
  • lead-free piezoelectric materials
  • piezoelectric nanogenerators

ASJC Scopus subject areas

  • Ceramics and Composites
  • Materials Chemistry

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