AC conductivity Mechanism and Dielectric Relaxation of Bulk Titanium Phthalocyanine Chloride (TiPcCl2)

Document Type : Original Article

Authors

1 Physics department, Faculty of sciences, South Valley University

2 22 Qena-st.

Abstract

The X-ray diffraction patterns (XRD) indicate that the powder of Titanium phthalocyanine chloride exhibits a polycrystalline nature, characterized by a triclinic structure. The AC electrical conductivity and dielectric properties of a bulk TiPcCl2 sample in pellet form were examined using evaporated ohmic Ag electrodes in a temperature range (293- 363K) and frequency range (50 HZ- 5 MHz). The frequency dependence of σAC follows the Jonscher’s universal dynamic law with the relation σAC = Aωs, where s is the frequency exponent. The observed value of s is less than a unit and decreases as the temperature rises, which was consistent with the correlated barrier hopping (CBH) model. The barrier height WM was determined. It is found also that lnσAC increases linearly with the reciprocal of the absolute temperature. This indicated that the AC conductivity is thermally activated process. The dielectric constant, ε_1, and the dielectric loss, ε_2, for bulk TiPcCl2 both dropped as frequency increases and rose as temperature rises. The dielectric modulus serves as an indicator for the existence of non-Debye relaxation events within the material. The relaxation periods, ascertained through analysis of the imaginary component of the modulus (M``), were found to conform to the Arrhenius equation.

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History

  • Receive Date: 27 August 2023
  • Revise Date: 31 August 2023
  • Accept Date: 03 September 2023

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