Dielectric Behaviour of Potassium Acetylacetonate
T.G. Abdel-Malika, M.E. Kassemb, R.M. Abdel-Latifa and S.M. Khalilb
aDepartment of Physics, Faculty of Science, El-Minia University, Egypt
bDepartment of Physics, Faculty of Science, Alexandria University, Alexandria, Egypt
Received: February 18, 1992; revised version: April 3, 1992
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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 Tc = 313 K. X-ray analysis revealed that at Tc, 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 Tc, is predominantly operating at the surface. Above Tc, the conduction is proceeding in the bulk material with contribution from the surface.
DOI: 10.12693/APhysPolA.81.681
PACS numbers: 77.40.+i