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Pressure induced ionic-superionic transition in silver iodide at ambient temperature.

Y H Han1, H B Wang1, I A Troyan1

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High pressure induces a superionic state in silver iodide (AgI-V) at room temperature. This discovery offers a new pathway to achieving high ionic conductivity in materials.

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Area of Science:

  • Materials Science
  • Solid State Chemistry
  • Ionic Conductivity

Background:

  • Silver iodide (AgI) is a model system for superionic state research.
  • Superionic conductivity in AgI typically requires high temperatures.

Purpose of the Study:

  • To investigate the effect of high pressure on silver iodide's ionic conductivity.
  • To explore the potential for inducing a superionic state at ambient temperature.

Main Methods:

  • Electrochemical impedance spectroscopy was used to study Ag(+) ion diffusion.
  • Analysis of the Warburg diffusion process under high pressure (12-17 GPa).

Main Results:

  • High pressure induced a superionic state in AgI-V at ambient temperature.
  • AgI-V exhibited ionic conductivity around 0.1 Ω(-1)cm(-1), three orders of magnitude higher than AgI-III.
  • Ag(+) ion diffusion coefficients in AgI-V were comparable to other superionic AgI phases.

Conclusions:

  • High pressure is a viable method to achieve superionic conductivity in AgI-V at room temperature.
  • The study provides evidence for disordered Ag(+) ion states in AgI-V under pressure.
  • This finding opens new avenues for designing superionic materials.