8th Liquid Matter Conference September 6-10, 2011 Wien, Austria ...

P8.30Thu 811:10-14:00Vitrification and crystallization processes of amonatomic systemTomoko Mizuguchi 1 and Takashi Odagaki 21 Kyushu University, 6-10-1 Hakozaki, Higashi-ku, 812-8581, Fukuoka, Japan2 Tokyo Denki University, Saitama, JapanWe investigate vitrification and crystallization processes of a monatomic system by molecular dynamicssimulation, where atoms interact via Lennard-Jones-Gauss potential. We first determinethe time-temperature-transformation diagram by observing the crystallization time of the rapidlyquenched state from the melt. The crystallization time becomes shortest at a certain temperatureT ∗ . The glassy state at low temperatures is shown to be fairly long-lived. In order to examineatomic mechanism of the crystallization, we introduce a modified incoherent intermediate scatteringfunction which measures the structural correlation to a target structure. We show that thecrystallization above and below T ∗ take different paths. We also determine the free energy landscape(FEL) and show that the atomic dynamics is consistent with the FEL picture of the glasstransition.30