Q-dependent collective relaxation dynamics of glass-forming liquid Ca_0.4K_0.6(NO₃)_1.4 investigated by wide-angle neutron spin-echo.

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_0.4K_0.6(NO₃)_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 n

SUBMITTER: Luo P 

PROVIDER: S-EPMC9018732 | biostudies-literature | 2022 Apr

REPOSITORIES: biostudies-literature