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

被引：58

作者：

Gupta, Shashaank ^{[1
]}

Priya, Shashank ^{[1
]}

机构：

[1] Virginia Tech, CEHMS, Blacksburg, VA 24061 USA

来源：

APPLIED PHYSICS LETTERS | 2011年 / 98卷 / 24期

关键词：

HYSTERESIS; MODEL; SYSTEMS; OXIDES;

D O I：

10.1063/1.3600058

中图分类号：

O59 [应用物理学];

学科分类号：

摘要：

In this letter, we report the dielectric and ferroelectric (FE) characteristics of potassium sodium niobate (K0.5Na0.5NbO3) 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 degrees C and Curie temperature of 407 degrees 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 > proportional to f(0.47Eo-0.85)E(o)(1.45f0.14) and < A > proportional to f(0.04)E(o) below and above the coercive field. (C) 2011 American Institute of Physics. [doi:10.1063/1.3600058]

引用

页数：3

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[11] The effect of oxygen vacancy on the oxide ion mobility in LaAlO3-based oxides [J].