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首页> 外文期刊>Journal of Alloys and Compounds: An Interdisciplinary Journal of Materials Science and Solid-state Chemistry and Physics >Surface structure induced by Ar~+-bombardment of decagonal AlNiCo
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Surface structure induced by Ar~+-bombardment of decagonal AlNiCo

机译：十方AlNiCo的Ar〜+轰击诱导的表面结构

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摘要

We have investigated the surfaces of decagonal AlNiCo single quasicrystals in UHV by Reflection High Energy Electron Diffraction (RHEED), Atomic Force Microscopy (AFM) and Auger Electron Spectroscopy (AES). The surfaces were prepared by Ar~+-sputtering and annealing. We observe well-defined RHEED patterns directly after sputtering at room temperature, revealing a ten-fold symmetry with respect to the azimuthal angle of the incident beam. Two patterns occur, alternating every 18 deg. This symmetry behaviour is probably caused by a bcc overlayer consisting of multiple domains in different orientations. The RHEED patterns show a strong temperature dependence. A spontaneous phase transition into a quasiperiodic structure is observed upon annealing to about 350 deg C. RHEED patterns of a flat, quasicrystalline surface of good structural quality are observed after sputtering at 400 deg C. As indicated by AES, the influence of oxygen on the structural behaviour seems to be important.
机译：我们已经通过反射高能电子衍射（RHEED），原子力显微镜（AFM）和俄歇电子能谱（AES）研究了超高压中十边形AlNiCo单准晶体的表面。通过Ar〜+溅射和退火制备表面。我们在室温下溅射后立即观察到清晰定义的RHEED图案，揭示了相对于入射光束方位角的十倍对称性。出现两种模式，每18度交替一次。这种对称行为可能是由包含不同方向的多个域的密件抄送覆盖层引起的。 RHEED模式显示出强烈的温度依赖性。在退火至约350摄氏度时，观察到自发相转变为准周期性结构。在400摄氏度下溅射后，观察到具有良好结构质量的平坦，准晶体表面的RHEED图案。结构行为似乎很重要。

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