Ferroelectric properties and dynamic scaling of 〈 100 〉 oriented (K0.5Na0.5)NbO3 single crystals

Shashaank Gupta, Shashank Priya

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Abstract

In this letter, we report the dielectric and ferroelectric (FE) characteristics of potassium sodium niobate (K0.5Na 0.5NbO3) single crystals grown by flux method. Orientation analysis of as-grown cubical-shaped crystals was conducted by electron backscattered diffraction technique revealing the 〈 100 〉 crystallographic orientation of two opposing major faces. Annealed crystals were found to exhibit FE orthorhombic to FE tetragonal transition temperature of 200 °C and Curie temperature of 407 °C. Poled 〈 100 〉 oriented crystals had longitudinal piezoelectric constant of 148 pC/N. Dielectric measurement as a function of temperature was conducted to determine the second order parameter in Gibbs free energy expansion. Dynamic hysteresis analysis on these crystals showed the power law relations to be of the form 〈A〉 ∝ f0.47Eo-0.85Eo1.45 f0.14 and 〈A〉 f0.04 Eo below and above the coercive field.

Original languageEnglish (US)
Article number242906
JournalApplied Physics Letters
Volume98
Issue number24
DOIs
StatePublished - Jun 13 2011

All Science Journal Classification (ASJC) codes

  • Physics and Astronomy (miscellaneous)

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