Structural dependence of the piezoelectric properties of KNbO3 nanowires synthesized by the hydrothermal method

Mi Ri Joung, In Tae Seo, Jin Seong Kim, Haibo Xu, Guifang Han, Min Gyu Kang, Chong Yun Kang, Seok Jin Yoon, Sahn Nahm

Research output: Contribution to journalArticlepeer-review

23 Citations (Scopus)


Because of the presence of OH- and H2O in the KN unit cell, tetragonal KNbO3 (KN) nanowires were formed when the synthesis was carried out at 120 C for 48 h. However, when the fabrication was conducted at high temperatures (≥150 C) or at 120 C for a long period of time (≥72 h), orthorhombic KN nanowires were formed. Moreover, the KN nanowires synthesized at 120 C for 60 h showed a morphotropic phase boundary (MPB) structure in which both tetragonal and orthorhombic structures coexisted. Tetragonal, orthorhombic and MPB KN nanowires were also grown on the Nb 5+-doped SrTiO3 substrate, and their d33 values were measured for the first time. A tetragonal KN nanowire exhibited a d 33 value of 23.5 pm V-1, which is larger than that of the orthorhombic KN nanowire (11.6 pm V-1), probably because of the softening effect of the metal vacancies. The MPB KN nanowires exhibited a larger d33 value of 40.0 pm V-1. The d33 values of KN nanowires increased to 104.5, 137.1 and 146.0 pm V-1 for the orthorhombic, tetragonal and MPB KN nanowires, respectively, after the KN nanowires were poled along the [1 0 0] direction by application of a DC voltage of 10 V.

Original languageEnglish
Pages (from-to)3703-3708
Number of pages6
JournalActa Materialia
Issue number10
Publication statusPublished - 2013 Jun


  • Nanowire
  • Perovskites
  • Piezoelectricity
  • Synthesis

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Ceramics and Composites
  • Polymers and Plastics
  • Metals and Alloys


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