利用分子动力学的方法研究了Pb纳米线熔化温度的尺寸效应.研究表明,纳米线的熔化温度随着尺寸的减小而降低,纳米线的熔化过程从表面开始,并逐渐向中心趋近.纳米线在熔化过程中,温度也在逐渐升高,这不同于块体材料.Pb纳米线熔化温度的变化量与相同尺寸Pb纳米薄膜的变化量之比为2:1.另外,Pb纳米线的热力学稳定结构存在一个临界尺寸S(2nm＜S＜2.5nm),尺寸＜S,Pb纳米线的稳定结构是晶态,而＜S则为非晶态.
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