Temperature dependence of the elastic moduli of ScF3

ORAL

Abstract

Understanding Negative Thermal Expansion materials (NTE) is critical to develop materials with tunable volumetric changes as a function of temperature. ScF3 has attracted attention because of its simple chemical structure and the extended range where NTE is observed (up to 1100K). Measuring elastic moduli can bring light on the interatomic potentials being proposed to explain the NTE.
We use Resonant Ultrasound Spectroscopy measurements to determine the resonant spectra as function of temperature from 4 to 400K using a large single crystal of ScF3. We also measure sound attenuation extracted from the peak’s width of representative resonances where we find evidence of a dissipative process below 30K, which coincides with an upturn observed in the elastic moduli.

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Presenters

  • Boris Maiorov

    Los Alamos National Laboratory, Materials Physics and Applications Division, Los Alamos National Laboratory, Los Alamos Natl Lab

Authors

  • Boris Maiorov

    Los Alamos National Laboratory, Materials Physics and Applications Division, Los Alamos National Laboratory, Los Alamos Natl Lab

  • Yongkang Luo

    Department of Physics and Astronomy, UCLA, Physics and Astronomy, Univ of California - Los Angeles, Los Alamos Natl Lab, Los Alamos National Laboratory

  • Marcel Remillieux

    Los Alamos National Laboratory

  • Jonathan Betts

    Los Alamos National Laboratory, Los Alamos Natl Lab, NHMFL-PFF, Los Alamos National Laboratory, National High Magnetic Field Laboratory

  • Gian Guzman-Verri

    Materials Science Division, Argonne National Laboratory, Argonne National Laboratory

  • Vladimir Voronov

    Kirensky Institute

  • Sahan Handunkanda

    Univ of Connecticut - Storrs, University of Connecticut, Department of Physics, University of Connecticut

  • Connor Occhialini

    Department of Physics, University of Connecticut, University of Connecticut

  • Jason Hancock

    Department of Physics and Institute of Material Science, University of Connecticut, Univ of Connecticut - Storrs, Department of Physics, University of Connecticut, University of Connecticut

  • Peter Littlewood

    James Franck Institute, University of Chicago, Physics, Univ of Chicago, Argonne National Laboratory

  • Albert Migliori

    Los Alamos National Laboratory, Los Alamos Natl Lab