Cockayne, E.
, Mihalkovic, M.
and Henley, C.
(2016),
Structure of Periodic Crystals and Quasicrystals in Ultrathin Films of Ba-Ti-O, Physical Review B, [online], https://doi.org/10.1103/PhysRevB.93.020101
(Accessed December 9, 2024)
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Structure of Periodic Crystals and Quasicrystals in Ultrathin Films of Ba-Ti-O
Published
Author(s)
, Marek Mihalkovic, Christopher L. Henley
Abstract
We model the remarkable thin-film Ba-Ti-O structures formed by heat treatment of an initial perovskite BaTiO$_3$ thin film on a Pt(111) surface. All structures contain a rumpled Ti-O network with all Ti threefold coordinated with O, and with Ba occupying the larger. mainly Ti_7O_7, pores. The quasicrystal structures is a simple decoration of three types of tiles: square, triangle and 30^o rhombus, with edge lengths 6.85 Angstroms, joined edge-to-edge in a quasicrystalline pattern; observed crystalline Ba-Ti-O structures are built from these and other tiles. Simulated scanning tunneling microscopy images reproduce the patterns seen experimentally, and identify the bright protrusions as Ba atoms. The models are consistent with all experimental observations.Citation
Physical Review B
Volume
93
Pub Type
Journals
Download Paper
Keywords
quasicrystals, thin films, barium titanate, dodecagonal
Citation
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Created January 7, 2016, Updated November 10, 2018