Investigations of Ferroelectric Polarization Switching in Potassium Nitrate Composite Films

Abstract

This article explains the experimental results of ferroelectric polarization switching (FPS) of potassium nitrate (KNO 3) with different polymers such as polyvinylidene fluoride (PVDF) and polyvinyl fluoride (PVF) using simple melt-press techniques. To analyze the ferroelectric polarization switching in potassium nitrate (KNO 3) composite films at room temperature, we applied the Ishibashi and Takagi theory (based on Avrami model) to the switching current transient. To investigate the dimensionality of domain growth, the ferroelectric polarization switching current (FPS current) was observed from the square-wave bipolar signals across a resistance of 0.1 kΩ in series with the composite films. The existence of a switching current transient pulse confirmed the ferroelectricity and indicated the stability of the ferroelectric phase (phase III) of KNO 3 at room temperature. Polarization hysteresis (P-E) characteristics supported the prominent features of ferroelectric polarization switching in the composite films at room temperature.

Analytical properties of switching current transients in ferroelectrics

“…Subsequently modeling of the properties complete switching current transients and partially switched current transients due to the application of bipolar square wave electrical signals are carried out. The trends of the switching current transients are generated analytically by variation of factors such as pulse-width, off-time, electric field amplitude and temperature for comparison with switching current transients reported in experiments [29,[44][45][46][47].…”