Evidence for the existence of an unusual structure in the nanorods of InSb
Evidence for the existence of an unusual structure in the nanorods of InSb
复制标题
InSb 纳米棒中存在不寻常结构的证据
DOI：
10.1007/s00339-002-1444-2
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发表时间：
2003
期刊：
影响因子：
--
通讯作者：
E. Skelton
中科院分区：
文献类型：
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作者：
M. Yousuf;S. Qadri;E. Skelton
基于最近对InSb纳米直径长丝具有奇异物理性质的预测，我们合成了这种材料并对其进行了表征。在本报告中，我们描述了InSb的一个不寻常阶段的发现。当InSb灯丝的直径小于100纳米时，就会出现这个新阶段。半径为33.0 nm的InSb长丝的高分辨率x射线衍射研究表明，InSb晶格为四边形，为S.G. I4/mmm，单位胞体积比2.0 GPa以上InSb中观察到的β-锡相大12倍。根据x射线衍射数据计算，在环境条件下，InSb纳米棒的密度比InSb的锌-闪锌矿相的密度高~ 22%，这意味着纳米棒承受的压力为~ 2 GPa。而半径≥50.0 nm的InSb纳米棒则呈现出与体材基本相同的锌闪锌矿结构和密度。
Motivated by the recent prediction that InSb nanometer-diameter filaments can exhibit exotic physical properties, we have synthesized this material and have characterized the filaments. In this report, we describe the finding of an unusual phase of InSb. This new phase occurs when an InSb filament has a diameter of less than 100 nm. High-resolution X-ray-diffraction studies of InSb filaments, having radii ≅33.0 nm, indicate the InSb crystal lattice to be tetragonal, S.G. I4/mmm, with a unit-cell volume 12 times larger than that of the β-tin phase observed in bulk InSb above 2.0 GPa. The density of an InSb nanorod, as calculated from X-ray-diffraction data, is ∼22% more than that of the zinc-blende phase of InSb at ambient conditions, implying that the nanorod experiences a pressure of ∼2 GPa. In contrast, InSb nanorods with radii ≥50.0 nm are observed to show zinc-blende structure and densities nearly the same as that of the bulk.