AC impedance and dielectric spectroscopic studies of Mg~(2+) ion conducting PVA-PEG blended polymer electrolytes

摘要

Polyvinyl alcohol (PVA)-polyethylene glycol (PEG) based solid polymer blend electrolytes with magnesium nitrate have been prepared by the solution cast technique. Impedance spectroscopic technique has been used, to characterize these polymer electrolytes. Complex impedance analysis was used to calculate bulk resistance of the polymer electrolytes. The a.c.-impedance data reveal that the ionic conductivity of PVA-PEG-Mg(N03)2 system is changed with the concentration of magnesium nitrate, maximum conductivity of 9-63 x 10~(-5) S/cm at room temperature was observed for the system of PVA-PEG-Mg(NO_3)_2 (35-35-30). However, ionic conductivity of the above system increased with the increase of temperature, and the highest conductivity of 1-71 x 10~(-3) S/cm was observed at 100° C. The effect of ionic conductivity of polymer blend electrolytes was measured by varying the temperature ranging from 303 to 373 K. The variation of imaginary and real parts of dielectric constant with frequency was studied.