doi: 10.7763/IJAPM.2012.V2.86
Crystal Growth and Dielectric Properties of Na<sub>0.5</sub>K<sub>0.5</sub>NbO<sub>3</sub>Single Crystal Grown by Flux Method Using B<sub>2</sub>O<sub>3</sub> Flux
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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> have been successfully grown by the high temperature flux solution method using B<sub>2</sub>O<sub>3</sub> flux. Structure of the grown KNN single crystals was confirmed by powder X-ray diffraction analysis. The chemical composition of the as-grown single crystal was determined by Energy Dispersive X-ray analysis (EDS). Dielectric properties and the domain structure of KNN single crystals were investigated. The two phase transition temperatures of orthorhombic-to- tetragonal (O-to-T) and tetragonal-to-cubic (T-to-C) are found to be around 210°C and 429°C respectively for KNN single crystals as revealed from the dielectric measurements. The surface roughness was estimated to be about 6.96nm at room temperature using AFM studies. The Raman spectrum shows the characteristic peaks υ1, υ2 and υ5 of KNN single crystals, which are correlated to the internal vibrations of the NbO6 octahedron. The formation of single crystal of (K<sub>0.5</sub>Na<sub>0.5</sub>)NbO<sub>3</sub> requires sintering below 1000°C to avoid the problem of potassium volatilization.
Keywords
- Dielectric properties
- flux method
- raman spectrum
- single crystal etc
How to Cite
R. Saravanan, D. Rajesh, S. V. Rajasekaran, R. Perumal, M. Chitra, and R. Jayavel, "Crystal Growth and Dielectric Properties of Na<sub>0.5</sub>K<sub>0.5</sub>NbO<sub>3</sub>Single Crystal Grown by Flux Method Using B<sub>2</sub>O<sub>3</sub> Flux," International Journal of Applied Physics and Mathematics, vol. 2, no. 3, pp. 190-193, 2012. https://doi.org/ 10.7763/IJAPM.2012.V2.86
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).