Single Crystal Quasielastic Neutron Study of Ionic Conduction in Cu2Se

ORAL

Abstract

Ionic conductivity plays a role in a wide range of energy technologies such as solid-state batteries, super capacitors, and fuel cell technology. We investigated ionic conductivity mechanisms in Cu2Se, a fast ion conductor, above its transition point at T = 400 K using single crystal Quasi-Elastic Neutron Scattering measurements covering volumes of reciprocal space, known as 4D-QENS. The Chudley-Elliott jump diffusion model was employed to analyze the QENS linewidth broadening, providing insights into the mechanisms of ionic conductivity, such as average residency times and diffusion coefficients. Different neutron beam energies were used in our investigations which aided in the separation of incoherent scattering and coherent scattering. This separation enabled us obtain details about the vacancy hopping and the correlated diffusion mechanisms which contribute to the ionic conductivity in this fast ion conductor which will be discussed.

*This work was supported by the U.S. Department of Energy, Office of Science, Basic Energy Sciences, Materials Sciences and Engineering Division.

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Presenters

  • Jared Coles

    • Northern Illinois University and Argonne National Laboratory

Authors

  • Jared Coles

    • Northern Illinois University and Argonne National Laboratory

  • Alex Rettie

    • University College London

  • Fabrizia Foglia

    • University College London

  • Jacques Ollivier

    • ILL
    • Institute Laue-Langevin
    • Institut Laue-Langevin

  • Omar Chmaissem

    • Northern Illinois University and Argonne National Laboratory

  • Stephan Rosenkranz

    • Argonne National Laboratory

  • Raymond Osborn

    • Argonne National Laboratory