Abstract
A molecular-dynamics simulation of lithium metasilicate (${\mathrm{Li}}_{2}$${\mathrm{SiO}}_{3}$) has been performed. A clear two-step relaxation was observed at 700 K in a density correlation function (self-part) for Li ions following an exponential decay by vibrational motion. Oscillation is found in the second (\ensuremath{\beta} relaxation) region of the function, which is attributed to the so-called ``boson peak.'' The oscillation is clearer for O and Si than for Li. T he slowest relaxation (\ensuremath{\alpha} relaxation) can be well fitted to a stretched exponential form, and an origin of this type of decay is confirmed to be a waiting time distribution of jump motions. Both the \ensuremath{\beta} relaxation and the boson peak are found to be due to correlated motion.
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