钽
流离失所(心理学)
无定形固体
Crystal(编程语言)
格子(音乐)
热力学
材料科学
熔化温度
晶体结构
凝聚态物理
结晶学
化学
物理
复合材料
心理治疗师
程序设计语言
冶金
计算机科学
声学
心理学
作者
Fan Xue,Deng Pan,Mo Li
标识
DOI:10.1088/1361-648x/aaf7f1
摘要
Understanding of melting is deeply rooted in the Lindemann criterion which predicts that the transition occurs when the mean vibrational atomic displacement reaches a universal value. The criterion also finds its way in atomic description of kinetics of various structural phase transitions involving liquid and amorphous phases. Here we show using atomistic modeling in bcc crystal tantalum that neither the universal displacement exists nor melting occurs at the anticipated value from the Lindemann criterion. Instead, before and at melting a series of strongly correlated atomic diffusional motions are set in with the atomic displacement far more complicated than that predicted by Lindemann based on independent atomic vibrations. The displacement leads to formation of new extended atomic configurations composed of lattice chains and loops of Ta atoms still residing on the crystal lattice. It is the proliferation of these lattice chains that leads to melting.
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