Dielectric and Electrical Properties of Intercalated ۱-(۴-nitrophenyl)-N-(p-tolyl) methanimine into the Interlayers of Bentonite Clay

In this work, the dielectric properties of intercalated ۱-(۴-nitrophenyl)-N-(p-tolyl) methanimine into bentonite interlayers were investigated in the frequency range ۱۰۲ to ۱۰۶ Hz at five different temperatures between ۲۴oC and ۶۰oC. The impedance of the composite decreased with increasing the temperature from ۲۴oC to ۶۰oC, as it drops ۷*۱۰۳ Ω at ۱۰۰ Hz and ۱.۵*۱۰۳ Ω at ۱ MHz. The composite showed a very low conductivity with little effect of increasing temperature in the low frequencies, yet the high frequencies make the effect of maximizing the temperature more obvious. The imaginary dielectric permittivity exhibited peaks of energy losses which reached the highest magnitude with ۶۰oC, whereas the dielectric breakdowns were shifted toward higher frequencies with increasing temperature. Moreover, the activation energy of relaxation time was obtained by using Arrhenius equation from the slope of ln(τ) vs. (KT)-۱ curve and the value was (۹۶۵.۲۴ J). In the same approach, the activation energies of charge carriers were estimated in three different frequency regions; high, moderate, and low regions and the values were ۵۲۹.۳۱, ۶۹۸.۰۹, and ۵۴۱.۹۸ J, respectively.

کلیدواژه ها:

Dielectric permittivity ، organo-clay composite ، Bentonite ، Schiff base ، conductivity ، activation energy ، relaxation time