Investigation of the Dielectric Properties of Antimony Doped Potassium Sodium Niobate Single Crystal (K_0.5Na_0.5) NbO₃ Grown by Flux Method

Abstract:

Single crystals of K_0.5Na_0.5NbO₃ (KNN) and 5wt%, 10wt%, 15wt% of Sb doped KNN crystals were grown by flux method. The formation of crystalline structure, microstructure, domain structure and the dielectric properties were investigated for both pure and Sb doped KNN single crystals. X-ray diffraction (XRD) pattern shows that pure and doped KNN single crystals have orthorhombic perovskite structure. The doped crystals have slight shrinkage in the unit cell volume. The partial substitution of the B-site ion Nb₅₊ by the Sb₅₊ ion in the KNN single crystal results in decreasing phase transition temperatures T_O-T and Curie temperatures TC of the doped crystals with increasing amount of Sb. The dielectric properties of the doped crystals show significant improvement with doping concentration. The peaks slightly shift towards lower frequencies with increasing dopant concentration.

• Periodical: Advanced Materials Research (Volumes 622-623)
• Pages: 224-228
• DOI: https://doi.org/10.4028/www.scientific.net/AMR.622-623.224
• Online since: December 2012
• Authors: R. Saravanan, D. Rajesh, S.V. Rajasekaran, R. Perumal, M. Chitra, R. Jayavel
• Keywords: Defect, Ferroelectric, KNN, Piezoelectric, Single Crystal

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