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Inelastic Electron Tunneling Spectroscopy at High-Temperatures.

Prosper Ngabonziza1, Yi Wang1, Peter A van Aken1

  • 1Max Planck Institute for Solid State Research, Heisenbergstraße 1, Stuttgart, 70569, Germany.

Advanced Materials (Deerfield Beach, Fla.)
|January 18, 2021
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Summary
This summary is machine-generated.

High-temperature inelastic tunneling spectroscopy now analyzes ion conductors. This breakthrough enables real-time, high-resolution studies of ion movement in solids above room temperature.

Keywords:
high-temperature tunneling spectroscopyinelastic tunneling spectroscopyionic diffusion, nanoionics, tunnel junctions

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Area of Science:

  • Solid-state ionics
  • Materials science
  • Spectroscopy

Background:

  • Ion conducting materials are vital for energy storage and electronic devices.
  • Current analytical methods for ion behavior in solids often lack spatial resolution or real-time capabilities.
  • Inelastic tunneling spectroscopy (ITS) offers potential but is typically limited to cryogenic temperatures due to spectral resolution constraints.

Purpose of the Study:

  • To develop and demonstrate inelastic tunneling spectroscopy (ITS) for analyzing ion conductors at temperatures above room temperature.
  • To overcome the limitations of spectral resolution in ITS at elevated temperatures.
  • To establish ITS as a viable tool for studying dynamic ion behavior in solid-state systems.

Main Methods:

  • Fabrication of high-temperature-stable tunnel junctions with ultrathin layers for efficient proton conduction.
  • Utilizing BaZrO3-based heterostructures for proton conduction studies.
  • Performing inelastic tunneling spectroscopy (ITS) measurements at 400 K (127 °C).

Main Results:

  • Demonstrated the first inelastic tunneling spectroscopy (ITS) studies of ion conductors above room temperature.
  • Achieved a spectral resolution of 20 meV at 400 K, significantly surpassing the predicted limit of 186 meV.
  • Successfully detected protons by analyzing the vibrational modes of O-H bonds.

Conclusions:

  • High-temperature inelastic tunneling spectroscopy (ITS) is now feasible for studying ion conductors.
  • The developed method provides high spatial resolution and real-time analysis of ion dynamics.
  • ITS is established as a novel and valuable analytical tool for the field of solid-state ionics.