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Title
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Synthesis of high-oxidation Y-Ba-Cu-O phases in superoxygenated thin films
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Author
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Abstract
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| It is known that solid-state reaction in high-pressure oxygen can stabilize high-oxidation phases of Y-Ba-Cu-O superconductors in powder form. We extend this superoxygenation concept of synthesis to thin films which, due to their large surface-to-volume ratio, are more reactive thermodynamically. Epitaxial thin films of YBa2Cu3O7-delta grown by pulsed laser deposition are annealed at up to 700 atm O-2 and 900 degrees C, in conjunction with Cu enrichment by solid-state diffusion. The films show the clear formation of Y2Ba4Cu7O15-delta and Y2Ba4Cu8O16 as well as regions of YBa2Cu5O9-delta and YBa2Cu6O10-delta phases, according to scanning transmission electron microscopy, x-ray diffraction, and x-ray absorption spectroscopy. Similarly annealed YBa2Cu3O7-delta powders show no phase conversion. Our results demonstrate a route of synthesis towards discovering more complex phases of cuprates and other superconducting oxides. |
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Language
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English
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Source (journal)
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Physical review materials / American Physical Society. - College Park, Md, 2017, currens
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Publication
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College Park, Md
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American Physical Society
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2018
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ISSN
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2475-9953
[online]
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DOI
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10.1103/PHYSREVMATERIALS.2.033803
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Volume/pages
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2
:3
(2018)
, 6 p.
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Article Reference
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033803
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ISI
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000428244900004
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Medium
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E-only publicatie
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Full text (Publisher's DOI)
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