AC conductivity analysis and dielectric relaxation behavior of [N(C3H7)(4)](2)Cu2Cl6

作者：Oueslati A^*; Hlel F; Guidara K; Gargouri M

来源：Journal of Alloys and Compounds, 2010, 492(1-2): 508-514.

DOI：10.1016/j.jallcom.2009.11.152

• Bis(tetrapropylammonium)hexachlorodicuprate (II)
• Dielectric measurements
• Conductivity
• Equivalent circuit

The AC electrical conductivity and the dielectric relaxation properties of the [N(C3H7)(4)](2)Cu2Cl6 compound have been investigated by means of impedance spectroscopy measurements over a wide range of frequencies and temperatures, 100 kHz-5 MHz and 303-403 K, respectively. Besides, a detailed analysis of the impedance spectrum suggested that the electrical properties of the material are strongly temperature dependent. Nyquist plots (Z '' versus Z') are well fitted to an equivalent circuit model which consists of a parallel combination of a bulk resistance R-b and constant phase elements CPE. The frequency-dependent conductivity data were fitted in the modified power law:
sigma(ac)(omega) = sigma(0) + A omega(n1) + A omega(n2)
The nature of variation of DC conductivity suggests Arrhenius type of electrical conductivity. Furthermore, the modulus plots can be characterized by full width at half height or in terms of a non-experiential decay function phi(t) = exp(-t/tau)(beta). Besides, the activation energy responsible for relaxation has been evaluated and found to be close to the DC conductivity.

• 出版日期2010-3-4