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Research & Development in Material Science

Vibrational Analysis and Electrical Conduction Mechanism Investigations ofOrder Disorder Phase Transitions in [N(C3H7)4]2ZnBr4Compound

  • Open or CloseSouad Chkoundali1, Abdelhedi Aydi1*and Faouzi HLEL2*

    1Laboratory of Multifunctional Materials and Applications (LaMMA), Faculty of Sciences of Sfax, University of Sfax, Tunisia

    2Laboratory of spectroscopic characterization and optics of materials, Faculty of Sciences, University of Sfax, Tunisia

    *Corresponding author:Abdelhedi Aydi, Laboratory of Multifunctional Materials and Applications (LaMMA), Faculty of Sciences of Sfax, University of Sfax, Tunisia

Submission: September 14, 2020;Published: November 13, 2020

DOI: 10.31031/RDMS.2020.14.000837

ISSN : 2576-8840
Volume14 Issue3


Bis-Tetrapropylammoniumtetrabromozincate has been synthesized and characterized by X-ray, vibrational spectroscopy and impedance spectroscopy. The Rietveld refinement of the XRD diffractogram confirms the crystallization of the compound through the monoclinic system (space group C2/c). A temperature study of the Raman scattering revealed two phase transitions at about T1=340 and T2=393K.The evolution of the wavenumber and the line width versus the temperature showed some singularities associated with the transitions, suggesting that they are governed by the re-orientation of the [N(C3H7)4]+organic part. The complex impedance plotted as semicircle arcs in the temperature range and the centers of the semicircles lie below the real axis, which indicates that the material is non-Debye type. Double semicircles were related to bulk and grain boundary effects. Furthermore, the alternating current conductivity of the [N(C3H7)4]2ZnBr4obeyed the Jonscher’s law: σAC(ω)=σdc+Aωs and the conduction could be attributed to the correlated barrier hopping (CBH) model in region (I) and (II)and the Non-overlapping Small Polaron Tunneling (NSPT) in region (III).

  • Keywords: Bis-Tetrapropylammoniumtetrabromozincate; Raman spectroscopy; Phase transition; Electrical conductivity; Conduction mechanismGet access to the full text of this article