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.
|Number of pages
|Materials Science and Engineering B: Solid-State Materials for Advanced Technology
|Published - Mar 2014
Bibliographical noteFunding 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