Structure, conductance and strength of iridium wires of single atom width
Structure, conductance and strength of iridium wires of single atom width
复制标题
DOI：
10.1143/jjap.45.8952
复制
发表时间：
2006-11-01
期刊：
影响因子：
--
通讯作者：
Kizuka, Tokushi
中科院分区：
文献类型：
--
作者：
Ryu, Minoru;Kizuka, Tokushi
通过原位透射电子显微镜同时测量电导和力，观察了两个纳米尺寸的Ir尖端在接触和随后的缩回过程中形成的单原子宽度的铱（It）线。Ir线由少量原子组成，原子间距为0.21-0.30 nm，沿原子收缩方向沿着直线生长。机械性能，即，弹性极限，杨氏模量和强度，个别铱线的原子尺度上的材料力学的基础上进行了分析。结果发现，在对比粗晶粒的Ir晶体，单原子宽度的Ir线的强度和弹性极限分别增加到25 +/- 17 GPa和0.21 +/- 0.04，而杨氏模量下降到90 - 55 GPa。在室温下，即使对于相同的宽度，单个原子，Ir线的电导范围也在0.2 - 3.0G（0）（G（0）= 2 e（2）/h，其中e是电子的电荷，h是普朗克常数）。
The formation of iridium (It) wires of single-atom width during the contact and subsequent retraction of two nanometer-sized Ir tips was observed by in situ transmission electron microscopy with simultaneous measurements of conductance and force. The Ir wires, composed of a few atoms, grew straight along the retraction direction with an interatomic distance of 0.21-0.30 nm. The mechanical properties, i.e., elastic limit, Young's modulus and strength, of individual Ir wires were analyzed on the basis of the mechanics of materials on an atomic scale. It was found that in contrast to coarse-grained Ir crystals, the strength and elastic limit of the single-atom-width Ir wires increased to 25 +/- 17 GPa and 0.21 +/- 0.04, respectively, while Young's modulus decreased to 90 55 GPa. The conductance of the Ir wires at room temperature ranged from 0.2 - 3.0G(0) (G(0) = 2e(2)/h, where e is the charge of an electron and h is Planck's constant), even for the same width, a single atom.