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Structural Investigation and Electrical Properties on K2Mg(1−x)Znx(SO4)2·6H2O: A Selective Picromerite-Type Electrode Materials

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Abstract

A series of K2Mg(1−x)Znx(SO4)2.6H2O (x = 0, 0.6, 1) materials have been prepared by slow evaporation method at room temperature. Characterized by means of X-ray diffraction (XRD), Fourier transform infrared spectroscopy (FTIR), and scanning electron microscopy (SEM) reveal the presence of pure single monoclinic phases (space group P21/a, Z = 2). Refined parameters shows that the substitution of Mg2+ by Zn2+ increases unit cell dimensions of picromerite-type phase. The vibrational characteristic of \({\text{SO}}_{4}^{2 - }\) groups and water molecules have been identified in the 400–4000 cm−1 wavenumber region. The results of electrical conductivity determined by impedance spectroscopy in the [633–693 K] temperature range for sintered pellets showed a maximum total conductivity of 3.65 × 10–6 S cm−1 and a minimum activation energy of 0.54 eV were obtained at 673 K for K2Mg(SO4)2 sample. The ac-conductivity (σac) measurements exhibit features typical characteristics of the universal dynamic response. The obtained results suggested that these materials are suitable candidates for application as electrodes in potassium-ion batteries (PIBs).

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Acknowledgements

The authors want to acknowledge the financial support of Tunisian Minister of Higher Education and Scientific Research. We are also grateful to the head of the Department of Physics and all members of laboratory of electrical conductivity of materials in the Bizerte Science Faculty.

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Authors and Affiliations

  1. Laboratoire d’Application de la Chimie aux Ressources et Substances Naturelles et à l’Environnement (LACReSNE), Université de Carthage, Faculté des Sciences de Bizerte, 7021 Zarzouna, Bizerte, Tunisia

    Radhouene Kahlaoui & Dalila Ben Hassen Chehimi

  2. Laboratoire de Chimie Minérale Appliquée (LCMA), LR19ES02, Département de Chimie, Faculté des Sciences de Tunis, Université de Tunis El Manar, Campus Universitaire Farhat Hached El Manar 1, 2092, Tunis, Tunisia

    Ahmed Souamti

  3. Instituto de Ciencia de Materiales de Madrid (ICMM), Consejo Superior de Investigaciónes Científicas (CSIC), Cantoblanco, 28049, Madrid, Spain

    Radhouene Kahlaoui

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  1. Radhouene Kahlaoui
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Correspondence to Radhouene Kahlaoui.

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Kahlaoui, R., Souamti, A. & Chehimi, D.B.H. Structural Investigation and Electrical Properties on K2Mg(1−x)Znx(SO4)2·6H2O: A Selective Picromerite-Type Electrode Materials. Chemistry Africa (2024). https://doi.org/10.1007/s42250-024-00900-x

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