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Dielectric Behaviour of Potassium Acetylacetonate

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Abdel-Malik T., Kassem M., Abdel-Latif R., Khalil S.
Acta Physica Polonica A
|
1992
|
vol. 81
|
issue 6
681-686
EN
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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