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Thermodynamic Analyses of the Solid-Liquid Interface and Growth Mode Transition in Undercooled Melts |
| LIU Ri-Ping |
| Key Laboratory of Metastable Materials Science and Technology, Yanshan University, Qinhuangdao 066004 |
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| Cite this article: |
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LIU Ri-Ping 2003 Chin. Phys. Lett. 20 1622-1625 |
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Abstract Free energy change for atoms transferred from liquid onto liquid-solid interface is calculated according to the structural model proposed by Jackson. Relationship among the change in free energy, the fraction of sites on the interface occupied by atoms and the interfacial undercooling is presented. This relationship can be used to judge the possible state that an interface may take, and to predict the corresponding crystal growth mode. For silicon and germanium, the experimentally observed growth mode transition from lateral growth at small undercooling to continuous growth at large undercooling is hardly to be explained by this thermodynamic calculation, which implies that the transition is possibly caused by some dynamic reasons. For nickel, crystallization is carried out only by the continuous mode, which is consistent with the experimental observations.
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| Keywords:
81.30.Fb
81.10.Aj
64.70.Dv
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Published: 01 September 2003
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| PACS: |
81.30.Fb
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(Solidification)
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81.10.Aj
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(Theory and models of crystal growth; physics and chemistry of crystal growth, crystal morphology, and orientation)
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64.70.Dv
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