Observation of a dodecagonal oxide quasicrystal and its complex approximant in the SrTiO 3 -Pt(1 1 1) system

2017/02/23 by Sebastian Schenk, Stefan Förster, Klaus Meinel +7 · 2 citations

paper · doi:10.1088/1361-648x/aa5bdb

Abstract

Abstract We report on the formation of a SrTiO 3 -derived dodecagonal oxide quasicrystal (OQC) at the interface to Pt(1 1 1). This is the second observation of a two-dimensional quasicrystal in the class of oxides. The SrTiO 3 -derived OQC exhibits strong similarities to the BaTiO 3 -derived OQC with respect to the local tiling geometry. However, the characteristic length scale of the SrTiO 3 -derived OQC is 1.8% smaller. Coexisting with the OQC a large scale approximant structure with a monoclinic unit cell is identified. It demonstrates the extraordinary level of complexity that oxide approximant structures can reach.

Cited by

• Flat quasicrystalline tilings in terms of density wave approach
• Host-atom-driven transformation of a honeycomb oxide into a dodecagonal quasicrystal

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