Abstract
The arrangement of yttrium atoms in YB56with YB66structure was determined by high-resolution electron microscopy (HREM) using a slow-scan CCD camera. Digital HREM images recorded along the [100], [110], and [111] directions of the YB56crystals showed “averaged” yttrium atom positions in the boron clusters, which were also confirmed by image simulation. Digital HREM images recorded from thin regions (<5 nm) directly showed the local yttrium atom arrangements in the YB56. In particular, the Y-hole, which consists of a single yttrium vacancy and a single yttrium atom, was detected in the boron clusters. The calculated images based on the proposed local structure model for yttrium atom arrangements agreed well with the observed images.
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