doi: 10.7763/IJAPM.2012.V2.91
Crystal Growth and Dielectric Property of Na<sub>0.5</sub>K<sub>0.5</sub>NbO<sub>3</sub> and Mn-Doped Na<sub>0.5</sub>K<sub>0.5</sub>NbO<sub>3</sub> Single Crystal Grown by Flux Method
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R. Jayavel
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- 1 the Crystal Growth Centre, Anna University, Chennai.
- 2 the G.T. Sollar Cell, China
- 3 the Govement Arts and Science College, Dharmapuri.
- 4 the Hanyang University, Seoul, South Korea.
- 5 the Centre for Nanoscience and Technology, Anna University, Chennai
Abstract
Lead free piezoelectric single crystals of (K<sub>0.5</sub>Na<sub>0.5</sub>)NbO<sub>3</sub> and 0.5 wt%, 1.0 wt% and 1.5 wt% MnO2 doped (K<sub>0.5</sub>Na<sub>0.5</sub>)NbO<sub>3</sub> (KNN) were grown by high-temperature solution method using K<sub>2</sub>CO<sub>3</sub>– Na<sub>2</sub>CO<sub>3</sub> eutectic composition as flux with addition of small amounts of boron oxide for lowering the melting temperature. The effect of the manganese dopant on the dielectric properties, surface morphology and the domain structure were investigated. The MnO<sub>2</sub>-doped KNN crystals were found to exhibit higher dielectric permittivity when compared with pure KNN single crystal. Mn doping increases the dielectric constant and decreases the dielectric loss. A slight decrease in the orthorhombic to tetragonal phase transition temperature T<sub>(O-T)</sub> and Curie temperature T<sub>C</sub> has been observed in manganese-doped KNN single crystals. From SEM and AFM analysis, the domain size of KNN–Mn crystal was found to be of the order of 5–13 μm at room temperature which is smaller than that of the pure KNN crystal (20–30 μm).
Keywords
- Ferroelectric
- defect
- KNN
- piezoelectric
- single crystal etc
How to Cite
R. Saravanan, D. Rajesh, S. V. Rajasekaran, R. Perumal, M. Chitra, and R. Jayavel, "Crystal Growth and Dielectric Property of Na<sub>0.5</sub>K<sub>0.5</sub>NbO<sub>3</sub> and Mn-Doped Na<sub>0.5</sub>K<sub>0.5</sub>NbO<sub>3</sub> Single Crystal Grown by Flux Method," International Journal of Applied Physics and Mathematics, vol. 2, no. 3, pp. 208-211, 2012. https://doi.org/ 10.7763/IJAPM.2012.V2.91
Copyright & License
Copyright © 2012 by the authors. This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited (CC BY 4.0).