Ionic-protonic conduction analysis and dielectric relaxation behavior of the rubidium ammonium arsenate tellurate

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• 作者：K. Ghorbel ; H. Litaiem ; L. Ktari ; S. Garcia-Granda ; M. Dammak
• 关键词：Rubidium ammonium arsenate tellurate ; DSC ; Impedance spectroscopy ; Dielectric properties ; Modulus
• 刊名：Ionics
• 出版年：2016
• 出版时间：February 2016
• 年：2016
• 卷：22
• 期：2
• 页码：251-260
• 全文大小：1,389 KB
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• 作者单位：K. Ghorbel (1)
  H. Litaiem (1)
  L. Ktari (1)
  S. Garcia-Granda (2)
  M. Dammak (1)
  
  1. Laboratoire de Chimie Inorganique (LCI), Faculté des Sciences de Sfax, Université de Sfax, BP 1171, Sfax, 3000, Tunisia
  2. Laboratoire de Chimie Physique et Analytique, Faculté de Chimie, Université d’Oviedo, Oviedo, 33006, Spain
  
• 刊物类别：Chemistry and Materials Science
• 刊物主题：Chemistry
  Electrochemistry
  Materials Science
  Physical Chemistry
  Condensed Matter
  Renewable Energy Sources
  Electrical Power Generation and Transmission
  
• 出版者：Springer Berlin / Heidelberg
• ISSN：1862-0760

文摘

The rubidium ammonium arsenate tellurate Rb_2.42(NH₄)_0.58H₂AsO₄HAsO₄.Te(OH)₆ compound was obtained by slow evaporation at room temperature. The differential scanning calorimetry (DSC) has shown three phase transitions at 453, 483, and 491 K, confirmed by the differential thermal analysis (D.T.A). As for the differential thermogravimetric analysis (TG) curve, it has revealed that no mass loss was detected before 475 K. So, the phase transition observed at 453 K does not correspond to the decomposition of this material. Rb_2.42(NH₄)_0.58H₂AsO₄HAsO₄.Te(OH)₆ was characterized by impedance spectroscopy technique measured in the 1 KHz–9.91 MHz frequency range from 298 to 483 K. Besides, the cole-cole (z” versus z’) plots were well fitted to an equivalent circuit built up by a parallel combination of resistance (R), fractal capacitance (CPE), and Warburg element (W). Furthermore, the conductivity evolution versus temperature has shown the presence of the ionic-protonic superconduction phase transition. The dielectric properties’ dependence on both temperature and frequencies of the compound has been reported. The ionic-protonic conductivity and conductivity relaxation calculated from the impedance and modulus spectra, respectively, were found to be thermally activated. Keywords Rubidium ammonium arsenate tellurate DSC Impedance spectroscopy Dielectric properties Modulus