Kinetics of the Topochemical Transformation of (PbSe)m(TiSe2)n(SnSe2)m(TiSe2)n to (Pb0.5Sn0.5Se)m(TiSe2)n
| Autor: | David W. Johnson, Jeffrey Ditto, Duncan R. Sutherland, Daniel B. Moore, Devin R. Merrill, Douglas L. Medlin |
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| Rok vydání: | 2018 |
| Předmět: |
Chemistry
Superlattice Kinetics Analytical chemistry 02 engineering and technology General Chemistry 010402 general chemistry 021001 nanoscience & nanotechnology 01 natural sciences Biochemistry Dark field microscopy Catalysis 0104 chemical sciences law.invention Chemical kinetics Colloid and Surface Chemistry law Scanning transmission electron microscopy Thin film Crystallization 0210 nano-technology Spectroscopy |
| Zdroj: | Journal of the American Chemical Society. 141:922-927 |
| ISSN: | 1520-5126 0002-7863 |
| DOI: | 10.1021/jacs.8b10681 |
| Popis: | Solid-state reaction kinetics on atomic length scales have not been heavily investigated due to the long times, high reaction temperatures, and small reaction volumes at interfaces in solid-state reactions. All of these conditions present significant analytical challenges in following reaction pathways. Herein we use in situ and ex situ X-ray diffraction, in situ X-ray reflectivity, high-angle annular dark field scanning transmission electron microscopy, and energy-dispersive X-ray spectroscopy to investigate the mechanistic pathways for the formation of a layered (Pb0.5Sn0.5Se)1+δ(TiSe2)m heterostructure, where m is the varying number of TiSe2 layers in the repeating structure. Thin film precursors were vapor deposited as elemental-modulated layers into an artificial superlattice with Pb and Sn in independent layers, creating a repeating unit with twice the size of the final structure. At low temperatures, the precursor undergoes only a crystallization event to form an intermediate (SnSe2)1+γ(TiSe2)m(PbS... |
| Databáze: | OpenAIRE |
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