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

Shashaank Gupta; Shashank Priya

doi:10.1063/1.3600058

Ferroelectric properties and dynamic scaling of 〈 100 〉 oriented (K_0.5Na_0.5)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 (K_0.5Na _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〉 ∝ f^0.47Eo-0.85E_o^{1.45 f0.14} and 〈A〉 f0.04 E_o below and above the coercive field.

Original language	English (US)
Article number	242906
Journal	Applied Physics Letters
Volume	98
Issue number	24
DOIs	https://doi.org/10.1063/1.3600058
State	Published - Jun 13 2011

All Science Journal Classification (ASJC) codes

Physics and Astronomy (miscellaneous)

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10.1063/1.3600058

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

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.",

author = "Shashaank Gupta and Shashank Priya",

note = "Funding Information: The authors gratefully acknowledge the financial support from Office of Basic Energy Science, Department of Energy (Grant No. DE-FG02–07ER6480). ",

year = "2011",

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doi = "10.1063/1.3600058",

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T1 - Ferroelectric properties and dynamic scaling of 〈 100 〉 oriented (K0.5Na0.5)NbO3 single crystals

AU - Gupta, Shashaank

AU - Priya, Shashank

N1 - Funding Information: The authors gratefully acknowledge the financial support from Office of Basic Energy Science, Department of Energy (Grant No. DE-FG02–07ER6480).

PY - 2011/6/13

Y1 - 2011/6/13

N2 - 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.

AB - 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.

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Ferroelectric properties and dynamic scaling of 〈 100 〉 oriented (K_0.5Na_0.5)NbO₃ single crystals

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