Relaxational Behavior of Mixed NaNbO₃-KNbO₃ System

Abstract

Using solid state reaction method, ceramic pellets of NaNbO ₃ , Na _0.6 K _0.4 NbO ₃ and Na _0.5 K _0.5 NbO ₃ have been prepared. Temperature and frequency dependence of dielectric constant and loss tangent of the prepared samples have been studied. It has been observed that, at the transition temperature, dielectric constant peak shifts to lower temperature, and the dielectric constant and loss tangent peak heights decrease, with increasing frequency; which shows the relaxational behavior of this system.

Keywords:

• Soft mode
• ferroelectrics
• antiferroelectrics
• sintering
• frequency shift and width
• relaxators

Acknowledgments

Authors are thankful to the Department of Science & Technology, New Delhi for financial support.