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

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

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5 Citations (Scopus)


(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
JournalJournal of the American Ceramic Society
Publication statusAccepted/In press - 2016



  • Lead-free piezoelectric materials
  • NKN platelet
  • Piezoelectric nanogenerators

ASJC Scopus subject areas

  • Ceramics and Composites
  • Materials Chemistry

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