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

Luo, Peng; Zhai, Yanqin; Falus, Peter; García Sakai, Victoria; Hartl, Monika; Kofu, Maiko; Nakajima, Kenji; Faraone, Antonio; Z, Y.

doi:10.1038/s41467-022-29778-4

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

Journal Article · 19 April 2022 · Nature Communications

DOI: https://doi.org/10.1038/s41467-022-29778-4 · OSTI ID:1863656

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; Hartl, Monika;

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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 Ca _0.4 K _0.6 (NO ₃ ) _1.4 , in the highly viscous liquid state. In contrast to the structure modulated dynamics for Q < 2.4 Å ⁻¹ , i.e., at and below the structure factor main peak, 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.

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Research Organization:: University of Illinois at Urbana-Champaign, IL (United States)

Sponsoring Organization:: National Science Foundation (NSF); USDOE; USDOE Office of Science (SC), Basic Energy Sciences (BES). Materials Sciences & Engineering Division (MSE)

Grant/Contract Number:: SC0014084

OSTI ID:: 1863656

Journal Information:: Nature Communications, Journal Name: Nature Communications Journal Issue: 1 Vol. 13; ISSN 2041-1723

Publisher:: Nature Publishing GroupCopyright Statement

Country of Publication:: United Kingdom

Language:: English

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

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