Orientation variation of surface strain
Orientation variation of surface strain
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DOI：
10.1103/physrevb.76.115425
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发表时间：
2007-09-01
影响因子：
3.7
通讯作者：
Robinson, I. K.
中科院分区：
文献类型：
--
作者：
Harder, R.;Pfeifer, M. A.;Robinson, I. K.
据报道，在略低于熔点的温度下，面状半球形Pb纳米晶体的表面层膨胀。相干x射线衍射图的反演从其平衡晶格间距得到晶体变形的定量三维图。晶体的大部分表面有明显的向外位移，并呈指数衰减成整体。这在（111）面本身被抑制，而在球面区域更强，这表明它是由下伏表面应力的方向变化引起的。
Expansion of the surface layers of a facetted hemispherical nanocrystal of Pb is reported at a temperature just below the melting point. Inversion of the coherent x-ray diffraction pattern yields quantitative three-dimensional maps of the deformation of the crystal from its equilibrium lattice spacing. Most of the surface of the crystal has a clear outward displacement, which decays exponentially into the bulk. This is suppressed on the (111) facet itself and is stronger on the spherical regions, suggesting that it arises from the orientational variation of the underlying surface stress.