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Analytical and Hysteresis Loop Studies of Ferroelectric Al- Doped KNbO3 Single Crystal

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Author Affiliations

  • 1Department of Applied Physics, Laxminarayan Institute of Technology, RTM Nagpur University, Nagpur-440033, India
  • 2Department of Applied Physics, Laxminarayan Institute of Technology, RTM Nagpur University, Nagpur-440033, India
  • 3Department of Physics, Arts, Commerce and Science College, Kiran Nagar, Amravati-444606, India

Res. J. Physical Sci., Volume 4, Issue (3), Pages 1-4, April,4 (2016)

Abstract

The doped KNbO3 single crystal have been prepared using flux method by taking K2CO3 and Nb2O5 as starting materials, in the molar ratio of 1.2:1 with an impurity of Al2O3 (200mg).The good quality single crystals were obtained by this method. The sample are partially transparent suitable for optical properties. The detailed study of structural parameters, dielectric and Hysteresis loop studies were carried out in this paper. The prepared sample has been characterized by X-Ray diffraction method to determine lattice parameters. The material is orthorhombic with lattice parameters as: a= 5.69399Å, b=3.96801 Å, and c= 5.71852 Å. The dielectric property shows the possibility of phase transition at high temperature. The material has high value of dielectric constant at Curie temperature of about 435°C.The hysteresis curve observed at room temperature todetermine various parameters particularly, the spontaneous polarization (Ps), remanent polarization (Pr) and coercive field (Ec). The value of spontaneous polarization is determined from the hysteresis curve 9.632 × 10-5µC/cm2 at E = 45.6V/cm. The other parameters i.e. remanent polarization (Pr) is equal to 1.60×10-5µC/cm2, and coercive field (Ec) is 24.85 V/cm.

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