Epitaxial TiO x Surface in Ferroelectric BaTiO 3 : Native Structure and Dynamic Patterning at the Atomic Scale
| Autor: | Andrew M. Rappe, Maya Barzilay, Tian Qiu, Yachin Ivry |
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| Rok vydání: | 2019 |
| Předmět: |
Materials science
Nanotechnology 02 engineering and technology Crystal structure 010402 general chemistry 021001 nanoscience & nanotechnology Condensed Matter Physics Epitaxy 01 natural sciences Atomic units Ferroelectricity 0104 chemical sciences Electronic Optical and Magnetic Materials Biomaterials chemistry.chemical_compound chemistry Nano Barium titanate Electrochemistry 0210 nano-technology Lithography Layer (electronics) |
| Zdroj: | Advanced Functional Materials. 30:1902549 |
| ISSN: | 1616-3028 1616-301X |
| Popis: | Surfaces and interfaces of ferroelectric oxides exhibit enhanced functionality, and therefore serve as a platform for novel nano and quantum technologies. Experimental and theoretical challenges associated with examining the subtle electro-chemo-mechanical balance at metal-oxide surfaces have hindered the understanding and control of their structure and behavior. Here, we combine advanced electron-microscopy and first-principles thermodynamics methods to reveal the atomic-scale chemical and crystallographic structure of the surface of the seminal ferroelectric BaTiO3. We show that the surface is composed of a native < 2-nm thick TiOx rock-salt layer in epitaxial registry with the BaTiO3. Using electron-beam irradiation, we successfully patterned artificially TiOx sites with sub-nanometer resolution, by inducing Ba escape. Therefore, our work offers electro-chemo-mechanical insights into ferroelectric surface behavior in addition to a method for scalable high-resolution beam-induced chemical lithography for selectively driving surface phase transitions, and thereby functionalizing metal-oxide surfaces. |
| Databáze: | OpenAIRE |
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