Unusual freezing and melting of gallium encapsulated in carbon nanotubes
Unusual freezing and melting of gallium encapsulated in carbon nanotubes
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DOI：
10.1103/physrevlett.93.095504
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发表时间：
2004-08-27
影响因子：
8.6
通讯作者：
Zhan, JH
中科院分区：
文献类型：
--
作者：
Liu, ZW;Bando, Y;Zhan, JH
利用透射电子显微镜对碳纳米管中镓的凝固和熔化行为进行了原位观察。结果表明，镓保持液体高达-80 degreesC时，封装在碳纳米管。详细的电子衍射分析结果表明，封装Ga可以结晶在β相或γ相，而不是共同的α相冷冻。β-Ga和γ-Ga都在-20 ℃左右熔化。虽然这非常接近本体β-Ga的熔点（-16 ℃），但它比本体γ-Ga的熔点（-35.6 ℃）高得多。据观察，在固化时，Ga相对于主体碳纳米管具有其独特的晶体取向。
The freezing and melting behavior of gallium (Ga) encapsulated in carbon nanotubes was investigated through in situ observation in a transmission electron microscope. It is shown that Ga remains liquid up to -80 degreesC when encapsulated in carbon nanotubes. Results of detailed electron diffraction analysis show that the encapsulated Ga can crystallize in either beta phase or gamma phase rather than the common alpha phase upon freezing. Both beta-Ga and gamma-Ga melt at around -20degreesC. While this is very close to the melting point of bulk beta-Ga (-16degreesC), it is considerably higher than that of bulk gamma-Ga (-35.6degreesC). It was observed that upon solidification, Ga has its unique crystallographic orientation relative to the host carbon nanotube.