Structural and Ferroelectric Properties of NaNO2: PVF Composite Film

Abstract

The structural and ferroelectric properties of NaNO2: PVF composite film prepared by hot press method have been studied and analyzed. The x-ray diffraction study revealed that the strain is reduced in the composite film. The image of field emission scanning electron microscope shows uniform distribution of NaNO2 grains of 150 nm size in the composite film. The differential scanning calorimetric curve supports the presence of ferroelectric phase. The polarization reversal characteristics were studied with the bipolar square pulse. The application of Ishibashi and Shur’s theory to the experimental switching transients supports needle like domain growth (1D) during switching process. The remanent polarization obtained from the polarization reversal is in agreement with the hysteresis loop value. The composite film shows faster switching time compared to pure NaNO2 film and may be attributed to the reduced strain.