Polarization reversal behavior of spray deposited sodium nitrite:poly(vinyl alcohol) composite films

摘要

The time dependence of polarization reversal current of spray deposited sodium nitrite:poly(vinyl alcohol) composite films has been investigated. The switching current transients have been analyzed by considering domain growth limited process with the Lorentzian distribution function of characteristic domain growth times based on nucleation limited switching model. This model gives excellent agreement with the experimental polarization reversal transients throughout the whole time range. The switching parameters were determined in the composite films deposited at different substrate temperatures (T_s). The minimum value of the activation field at T_s=200 ℃ makes the polarization reversal more probable. The peak value of polarization current exhibits exponential dependence on the external applied field.