Time-dependent melting and superheating of lead crystallites
Time-dependent melting and superheating of lead crystallites
复制标题
铅微晶随时间变化的熔化和过热
DOI：
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发表时间：
1982
期刊：
影响因子：
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通讯作者：
G. Spiller
中科院分区：
文献类型：
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作者：
G. Spiller
摘要用原位电子显微镜研究了小颗粒铅的熔化过程。不同形状的颗粒进行了检查，发现有定性不同的熔化行为。特别是，具有广泛{111}表面的薄片状形式具有在本体熔点附近每单位时间熔化的概率，这是先前在铋颗粒中报道的现象（Peppiatt 1975）。因此，一些颗粒可能会过热高达2 K以上的本体熔点。相比之下，多面体铅粒子没有表现出异常的影响。时间依赖性行为归因于液体在{111}表面上成核的困难。观测结果可作为研究表面熔化的基础。
Abstract The melting of small lead particles was studied by in situ electron microscopy. Particles of different shapes were examined and found to have qualitatively different melting behaviours. In particular, a thin platelet form with extensive {111} surfaces had a probability of melting per unit time near the bulk melting point, a phenomenon previously reported in bismuth particles (Peppiatt 1975). Some particles could be superheated by up to 2 K above the bulk melting point as a consequence. In contrast, polyhedral lead particles showed no anomalous effects. The time-dependent behaviour is attributed to the difficulty in nucleating the liquid on the {111} surface. The observation could be used as the basis for a study of surface melting.