Correlation between the ionic conductivity and the relaxation mechanisms during the 436 K- transition in nitrate salt RbNO3: analysis by impedance spectroscopy

Authors

  • Khaled Hammami Laboratoire Physico-Chimie de L’État Solide, Faculté des Sciences BP 1171, 3000 SAfax
  • Taher Mhiri Laboratoire Physico-Chimie de L’État Solide, Faculté des Sciences BP 1171, 3000 SAfax
  • Xavier Le Goff Laboratoire Diffusion – Diffraction, UMR 5257 Institut de Chimie Séparative de Marcoule BP 17171, 30207 Bagnols
  • Khaled JARRAYA Laboratoire Physico-Chimie de L’état Solide,LR11ES51, Faculté des Sciences BP 1171, 3000 Sfax, Tunisie

DOI:

https://doi.org/10.24297/jac.v10i3.2276

Keywords:

Impedance spectroscopy, Ionic conductivity, Modulus analysis, Permittivity, Dielectric relaxation

Abstract

The measurements of the complex impedance Z*, the conductivity σ, the dielectric permittivity ε’r, and the complex modulus M* were carried out on the RbNO3 compound at frequencies ranging between 1 and 106 Hz. In fact, the conductivity follows the Arrhenius law in the different temperature ranges σT = σ0exp (-ΔEσ/kT). Actually, the resulting curve shows an anomaly between 425 and 436 K and a sudden increase in conductivity to 436 K causing σ to pass from 1.6x10-6 Ω-1.cm-1 to 9.3x10-5 Ω-1.cm-1. This behavior clearly confirms the ionic character of the phase transition at this temperature. The main objective of this research study is to show the correlation between the ionic conductivity and the relaxation mechanisms during this transition.

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Author Biography

Khaled JARRAYA, Laboratoire Physico-Chimie de L’état Solide,LR11ES51, Faculté des Sciences BP 1171, 3000 Sfax, Tunisie

Departement de Chimie

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Published

2014-04-04

How to Cite

Hammami, K., Mhiri, T., Le Goff, X., & JARRAYA, K. (2014). Correlation between the ionic conductivity and the relaxation mechanisms during the 436 K- transition in nitrate salt RbNO3: analysis by impedance spectroscopy. JOURNAL OF ADVANCES IN CHEMISTRY, 10(3), 2447–2456. https://doi.org/10.24297/jac.v10i3.2276

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Articles