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AC Conductivity of Cobalt Phthalocyanine

100%

Abdel-Malik T., Kassem M., Aly N., Khalil S.

Acta Physica Polonica A

1992

vol. 81

issue 6

675-680

The dielectric properties of cobalt phthalocyanine are investigated in the frequency range 50-5×10^{5} Hz and within the temperature range 293-363 K. The frequency dependence of the AC impedance could be expressed by the complex plane of the complex impedance. Analysis of the AC conductivity reveals semiconducting features based predominantly on the hopping mechanism. The relaxation time, derived from the experimental results, shows a thermally activated process.

Dielectric Behaviour of Potassium Acetylacetonate

100%

Abdel-Malik T., Kassem M., Abdel-Latif R., Khalil S.

Acta Physica Polonica A

1992

vol. 81

issue 6

681-686

The dielectric constant and the dielectric loss of potassium acetylacetonate, K(acac), are measured as a function of both temperature and frequency. A peak value is obtained at the a critical temperature T_{c} = 313 K. X-ray analysis revealed that at T_{c}, K(acac) undergoes phase transition from orthorhombic to triclinic structure. The Cole-Cole diagrams have been used to determine the molecular relaxation time τ. The temperature dependence of τ is expressed by thermally activated process. The impedance spectra in the frequency range from 50 Hz to 500 kHz plotted in the complex plane show semicircles. The conduction mechanism, below T_{c}, is predominantly operating at the surface. Above T_{c}, the conduction is proceeding in the bulk material with contribution from the surface.

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2 Acta Physica Polonica A

2 1992

2 Abdel-Malik T.

2 Kassem M.

2 Khalil S.

1 Abdel-Latif R.

1 Aly N.

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AC Conductivity of Cobalt Phthalocyanine

Dielectric Behaviour of Potassium Acetylacetonate