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A substance that reaches superconductivity, a state in which magnetic fields cannot penetrate, and there is no electrical resistance, is referred to as a superconductor. In 1911, Heike Kamerlingh Onnes of Leiden University, a Dutch physicist, observed a relation between the temperature and the resistance of the element mercury. The mercury sample was then cooled in liquid helium to study the linear dependence of resistance on temperature. It was observed that, as the temperature decreased, the...
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Anharmonic Phonon Scattering Triggering Multi-ion Migration in Oxide-Based Superionic Conductors.

Jae-Bum Kim1, Chihun Kim1,2, Wootack Chung1

  • 1Department of Materials Science and Engineering, Korea University, Seoul 02841, Republic of Korea.

Journal of the American Chemical Society
|September 6, 2025
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Summary
This summary is machine-generated.

Anharmonic lattice vibrations drive ultrafast lithium ion migration in solid electrolytes, challenging equilibrium models. This discovery offers a new framework for designing highly conductive solid-state electrolytes.

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Area of Science:

  • Solid-state chemistry
  • Materials science
  • Condensed matter physics

Background:

  • Thermodynamic equilibrium models are insufficient for Li ion migration in superionic conductors.
  • Less-crystalline materials show anomalously high Li ion conductivity, defying classical frameworks.
  • A lattice dynamics perspective is needed to understand nonequilibrium phonon interactions and structural responses.

Purpose of the Study:

  • To uncover the phonon-governed Li ion migration mechanism in garnet-structured superionic conductors.
  • To compare Ta-doped LLZTO4 with undoped LLZO to elucidate doping effects on ion migration.
  • To establish a link between lattice thermodynamics and superionic conduction.

Main Methods:

  • Terahertz time-domain spectroscopy (THz-TDS)
  • 7Li magic-angle spinning nuclear magnetic resonance (MAS-NMR)
  • Raman spectroscopy

Main Results:

  • Ta doping softens the lattice and enhances anharmonic phonons in LLZTO4.
  • Anharmonic phonons enable collective, multi-ion migration, surpassing single-ion hopping models.
  • Lattice softening creates a disordered energy landscape, lowering activation barriers and increasing Li ion conductivity.

Conclusions:

  • Anharmonic lattice vibrations are the driving force for ultrafast Li ion migration in solid electrolytes.
  • This study provides a new paradigm linking lattice dynamics to superionic conduction.
  • Findings offer a framework for designing advanced solid-state electrolytes with high conductivity.