Conductivity and Dielectric Spectroscopy of Na+ Ion Conducting Blended Solid Polymer Nanocomposites

A new blend solid polymer electrolyte based on polyethylene oxide (PEO)-poly (vinyl pyrrolidone) (PVP) with sodium nitrate (NaNO3) has been synthesized via the standard solution cast technique. The temperature-dependent dielectric properties of the prepared polymeric films have been investigated by dielectric spectroscopy. With the increase of temperature the dielectric constant and dc conductivity increases. The increase in dielectric strength with temperature for polymer salt matrix (4.27 × 107 at 40 °C to 1.59 × 108 at 100 °C) evidences the enhancement in the number of charge carriers. The frequency associated with the maximum polarization shifts toward the high frequency and infers the effective role of salt and temperature. Then the relaxation time is obtained that decreases with the increase of temperature (57 s; at 40 °C to 25 s; at 100 °C) and are associated with the faster segmental motion of the polymer chain. A briefly discussed model has been proposed to justify the obtained experimental results.