Ferroelectric Properties of Polyvinyl Alcohol: Potassium Nitrate Composite Films

Abstract

The ferroelectric response of polyvinyl alcohol (PVA): KNO 3 composite film has been studied. The remanent polarization, coercive field and current density have been found from P-E loop characteristics. The ferroelectric behaviour of the composite films has been attributed to the predominant presence of phase III of KNO 3 in these films. This has been confirmed by the X-ray measurements. The differential scanning calorimetry (DSC) has been used for phase analysis. The variation of electrical conductivity as a function of temperature has been studied. The ferroelectric hysteresis loop characteristics have also been analyzed under different poling conditions.

Preparation and Characterization of the Ferroelectric Potassium Nitrate: Poly(vinyl alcohol) Composite Films

“…In view of this observation, the composite films with 50:50 wt.% of Kno 3 and PVa were chosen for further ferroelectric studies. The value of the P r ~20.10 μc/cm 2 in these spray-deposited films is more than 4 times as reported in the poled Kno 3 :PVa films prepared by solvent cast technique [53] and about more than twice that observed in pure fused Kno 3 films [40]. This value of P r is slightly greater than that reported for Kno 3 :PVdF composite films prepared by hot press method [12] and approximately half that of the fused Kno 3 :PVdF [11].…”

Ferroelectric Phase Stability Studies in Spray Deposited KNO3:PVA Composite Films

“…The value of the P r ∼17 μC/cm 2 in the optimized KNO 3 :PVA composite films prepared by spray‐deposition technique is more than three times as reported in the poled KNO 3 :PVA films prepared by solvent cast technique 47 and about twice that observed in pure fused KNO 3 films 22 . This value of P r is slightly lower than that reported for KNO 3 :PVDF composite films 26 .…”