Abstract
The composite films of potassium nitrate (KNO3):poly(vinyl alcohol) (PVA) have been prepared at different temperatures by spray‐deposition technique. Ferroelectric hysteresis loops were traced at room temperature for the composite films using modified Sawyer and Tower circuit. The X‐ray diffraction studies confirm the existence of ferroelectric phase III of KNO3 in the composite films at the room temperature, where this phase in pure KNO3 films is known to exist in the temperature range 110°–124°C. The composite films deposited at 200°C shows the optimum remanent polarization, Pr∼17 μC/cm2. The Pr was studied in the frequency range 10 Hz–1 kHz. The stability of the Pr in the composite films exhibits improved fatigue compared with that of quenched KNO3 films. The capacitance–voltage (C–V) characteristics exhibits butterfly features which supports the presence of ferroelectric phase in the composite films. The atomic force microscopy images show that the composite films have uniform dispersion of KNO3 particles in the PVA matrix.
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