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Temperature And Frequency Effect On The Electrical Properties Of Bulk Nickel Phthalocyanine Octacarboxylic Acid (Ni-Pc(COOH)8)

K. J. Hamam, Gellert Mezei, Z. Khattari, M. Maghrabi, F. Afaneh, Wisam A. Al Isawi, F. Salman
Published 2018 · Materials Science

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The AC conductivity of nickel phthalocyanine octacarboxylic acid was investigated from 100 Hz to 1 MHz and temperature from 290 to 423 K. The AC conductivity was found to vary with frequency (σ(f)) and form two dispersion regions; the associated exponent factor “s” values were found to vary from 1.17 to 1.34 and from 0.42 to 0.67 (< 1). The value and temperature dependent of s are found in agreement with conduction mechanism models of large-polaron tunneling and the correlated barrier hopping, at the first and the second regions, respectively. The real and the imaginary parts of the dielectric constant were observed to decrease as the frequency increases indicating the pronounce contribution of low-frequency polarization mechanisms. Furthermore, the activation free energy ∆F, enthalpy ∆H, and entropy ∆S of the sample were calculated as well.
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