[2P01-53] Poster Presentation

[2P39] Growth of oxide quasicrystal-related structures of ultrathin Ce-Ti-O films on Pt(111)

*Xu Li¹, Lap Hong Chan¹, Sho-ichi Takakura², Masashi Nakatake², Tsunetomo Yamada³, Ryuji Tamura⁴, Junji Yuhara¹ (1. Department of Energy Engineering, Nagoya University, 2. Aichi Synchrotron Radiation Center, 3. Department of Applied Physics, Tokyo University of Science, 4. Department of Materials Science and Technology, Tokyo University of Science)

Oxide quasicrystal (OQC) with dodecagonal clusters was reported to be prepared from ultrathin Ba-Ti-O and Sr-Ti-O films on Pt(111). Here, the rare earth element Ce is used to replace the Ba/Sr metallic elements, to prepare the OQC ultrathin films on Pt(111). The Ce-Ti-O ultrathin film was prepared by depositing 0.5 ML Ce and 1 ML Ti on Pt(111), following with annealing in oxygen atmosphere and vacuum. An arrangement of dodecagonal clusters consisted of triangles and squares were locally observed. In addition, the triangles in the center of the dodecagons, which have an unequal distance to the clusters, leading to the appearance of trapezoids. Thus, it is recognized as a OQC-related structure. The valence states and atomic density have proposed the relevant ideal possible schematic structural models, where the Ce atoms occupy the tiling corners. The stoichiometry of the OQC-related structure model is Ce₁₈Ti₁₄O₄₁ per unit cell.