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AC and DC conductivity study of LiH2PO4 compound using impedance spectroscopy

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Abstract

The lithium dihydrogen phosphate LiH2PO4 has been investigated by X-ray powder diffraction, scanning electron microscopy (SEM), and electrical impedance spectroscopy. The Rietveld refinements based on the XRD patterns show that the compound is crystallized in the orthorhombic system with Pna21 space group, and the refined unit cell parameters are a = 6.2428 Å, b = 7.6445 Å, and c = 6.873 Å. The electrical properties were studied using complex impedance spectroscopy as a function of frequency (104–107 Hz) at various temperatures (300–400 K). The Nyquist plots are well fitted to an equivalent circuit consisting of a series of combination of grains and inhomogeneous electrode surface effect. The frequency dependence of the conductivity is interpreted in terms of Jonscher’s law. Moreover, the near value of the activation energies obtained from the equivalent circuit and analysis of M″ confirms that the transport is through ion hopping mechanism dominated by the motion of the proton in the structure of the investigated material.

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Authors and Affiliations

  1. Unité de recherche de physique des matériaux isolants et semi isolants, Faculté des Sciences de Sfax, Université du Sfax, Route de Soukra Km 3.5, BP 1171, 3000, Sfax, Tunisia

    T. Rhimi & S. Guermazi

  2. Unit of Dynamics and Structure of Molecular Materials, B.P. 717, 62228, Calais, France

    G. Leroy

  3. University Lille North of France, ULCO, UDSMM, 59140, Dunkerque, France

    B. Duponchel

  4. Laboratoire de Physique des Matériaux et des Nanomatériaux appliquée à l’Environnement, Faculté des Sciences de Gabes, Cité Erriadh, 6079, Gabés, Tunisia

    K. Khirouni

  5. Laboratoire Physico-Chimique de L’Etat Solide, Faculté des Sciences de Sfax, Université du Sfax, Route de Soukra Km 3.5, BP 802, 3018, Sfax, Tunisia

    M. Toumi

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  1. T. Rhimi
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Correspondence to T. Rhimi.

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Rhimi, T., Leroy, G., Duponchel, B. et al. AC and DC conductivity study of LiH2PO4 compound using impedance spectroscopy. Ionics 24, 1305–1312 (2018). https://doi.org/10.1007/s11581-017-2306-4

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  • DOI: https://doi.org/10.1007/s11581-017-2306-4

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