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Q-dependent collective relaxation dynamics of glass-forming liquid Ca0.4K0.6(NO3)1.4 investigated by wide-angle neutron spin-echo

Author

Listed:
  • Peng Luo

    (University of Illinois at Urbana-Champaign)

  • Yanqin Zhai

    (University of Illinois at Urbana-Champaign
    University of Illinois at Urbana-Champaign)

  • Peter Falus

    (Institut Laue-Langevin (ILL))

  • Victoria García Sakai

    (Rutherford Appleton Laboratory, Science & Technology Facilities Council)

  • Monika Hartl

    (European Spallation Source)

  • Maiko Kofu

    (J-PARC Center, Japan Atomic Energy Agency, Tokai)

  • Kenji Nakajima

    (J-PARC Center, Japan Atomic Energy Agency, Tokai)

  • Antonio Faraone

    (NIST Center for Neutron Research, National Institute of Standards and Technology, 100 Bureau Drive)

  • Y Z

    (University of Illinois at Urbana-Champaign
    University of Illinois at Urbana-Champaign
    University of Illinois at Urbana-Champaign)

Abstract

The relaxation behavior of glass formers exhibits spatial heterogeneity and dramatically changes upon cooling towards the glass transition. However, the underlying mechanisms of the dynamics at different microscopic length scales are not fully understood. Employing the recently developed wide-angle neutron spin-echo spectroscopy technique, we measured the Q-dependent coherent intermediate scattering function of a prototypical ionic glass former Ca0.4K0.6(NO3)1.4, in the highly viscous liquid state. In contrast to the structure modulated dynamics for Q 2.4 Å−1, beyond the first minimum above the structure factor main peak, the stretching exponent exhibits no temperature dependence and concomitantly the relaxation time shows smaller deviations from Arrhenius behavior. This finding indicates a change in the dominant relaxation mechanisms around a characteristic length of 2π/(2.4 Å−1) ≈ 2.6 Å, below which the relaxation process exhibits a temperature independent distribution and more Arrhenius-like behavior.

Suggested Citation

  • Peng Luo & Yanqin Zhai & Peter Falus & Victoria García Sakai & Monika Hartl & Maiko Kofu & Kenji Nakajima & Antonio Faraone & Y Z, 2022. "Q-dependent collective relaxation dynamics of glass-forming liquid Ca0.4K0.6(NO3)1.4 investigated by wide-angle neutron spin-echo," Nature Communications, Nature, vol. 13(1), pages 1-9, December.
    • Handle: RePEc:nat:natcom:v:13:y:2022:i:1:d:10.1038_s41467-022-29778-4
    DOI: 10.1038/s41467-022-29778-4
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    References listed on IDEAS

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    1. Pablo G. Debenedetti & Frank H. Stillinger, 2001. "Supercooled liquids and the glass transition," Nature, Nature, vol. 410(6825), pages 259-267, March.
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