Coexistence of piezoelectricity and electric conduction in oxygen-deficient NaNbO3-δ sub-micron cubes

B. K. Yun, Y. K. Park, P. G. Kang, J. H. Jung, N. Lee, W. Jo, H. Shin, S. Yoon

Research output: Contribution to journalArticlepeer-review

2 Scopus citations


We have investigated the effect of oxygen vacancy on the structural and electrical properties of NaNbO3 sub-micron cubes. Through the Rietveld analysis and Raman scattering, we have confirmed that both NaNbO 3 and oxygen deficient NaNbO3-δ have Pmc2 1 symmetry, which has no space-inversion. The oxygen vacancy seems to induce the change from the ferroelectricity of NaNbO3 to the piezoelectricity of NaNbO3-δ and the increase of electric conduction. This work may provide the plausible way to realize sub-micron-size lead-free piezoelectric semiconductors with perovskite structure, which should be quite useful for piezoelectric energy harvesting, switchable diode, and photovoltaic applications.

Original languageEnglish
Pages (from-to)81-85
Number of pages5
JournalMaterials Science and Engineering B: Solid-State Materials for Advanced Technology
Issue number1
StatePublished - Mar 2014

Bibliographical note

Funding Information:
This research was supported by Basic Science Research Program through the National Research Foundation of Korea (NRF) funded by the Ministry of Education, Science and Technology ( 2012R1A1A2002536 ).


  • Electric conduction
  • Oxygen vacancy
  • Piezoelectricity


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