[1Ca01-05] Micro analysis of new materials: Microbeam analysis (MBA) Division's Session

[1Ca04] Growth and structure of an ultra-thin oxide quasicrystal film and its crystalline approximant on Pt(111)

*Junji Yuhara¹ (1. School of Engineering, Nagoya University)

As a new family of quasicrystals (QCs), ultra-thin oxide quasicrystal films on Pt(111) were discovered by Förster in 2013. Identifying the geometrical structure is an inevitable challenge not only for fundamental studies of this material’s unique chemical and physical properties, but also for industrial applications. In general, QC structures can be expressed as cluster tiling. The clusters are arranged quasi-periodically for a QC, while clusters are arranged periodically for a crystalline approximant. We report the growth of well-ordered, large-area, ultra-thin Ba-Ti-O, Ce-Ti-O, and Yb-Ti-O films on Pt(111). We examined the elemental atomic density by STM, low-energy electron diffraction, Auger electron spectroscopy, and X-ray photoelectron spectroscopy (XPS). For quantitative analysis, Rutherford backscattering spectroscopy was employed to obtain calibration XPS intensity curves as a function of elemental atomic density.