The effect of the nanodiamonds additive on ionic conductivity of silver iodide

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Composite solid electrolytes AgI-CND (CND is nanodiamonds powder) were prepared and their properties were investigated by methods of X-ray diffraction, differential scanning calorimetry (DSC) and impedance spectroscopy. It was found that the addition of CND results in a strong increase in the ionic conductivity of AgI at temperatures below phase transition to the α-AgI phase. According to the results of DSC, no strong changes in thermodynamic properties of the salt in the composites occur. Therefore, in contrast to the AgI-oxide composites, the most probable reason of the conductivity increase in AgI-CND composites is formation of stable network of intergrains and anti-phase domain boundaries acting as conductivity pathways in the composites. Due to the particle-reinforcement effect on nanodiamond particles the AgI matrix in the composites may undergo strong local stresses leading to the stabilization of the polytypes. The peaks of such phases are detected in X-ray diffractograms of the composites. The maximum conductivity of AgI-CND composites, 5.6·10-4 S/cm at 31 °C observed in the composites containing 80 mol % CND, is comparable to the best values obtained for oxide-based composites with silver iodide. Thus, nanodiamonds is the first non-oxide additive which caused a strong enhancement of the ionic conductivity of AgI low temperatures.

Original languageEnglish
Pages (from-to)373-376
Number of pages4
JournalMaterials Today: Proceedings
Publication statusPublished - 1 Oct 2019
Event3rd All-Russian Conference, with International Participation Hot Topics of Solid State Chemistry : From New Ideas to New Materials, HTSSC 2019 - Novosibirsk, Russian Federation
Duration: 1 Oct 20195 Oct 2019


  • Article reinforcement effect
  • Composite solid electrolyte
  • Enhanced ionic conductivity
  • Nanodiamonds
  • Silver iodide
  • AGI


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