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- W2035321377 abstract "High resolution electron microscopy is performed on a number of samples of YBa2Cu3O7 before and after heating at several temperatures between 20 and 450 °C, and in three different atmospheres: oxygen, air, and vacuum. By comparison studies of the same crystals it is shown that in all atmospheres the surface decomposes rapidly at temperatures above approximately 150 °C. Below 150 °C the rate of decomposition is much lower; crystals exposed to air for one week show several planar defects indicating the onset of the decomposition. The decomposition reaction proceeds by the insertion of extra CuO planes into the original structure resulting in (CuO)2 double layers between BaO planes. This reaction induces large lattice strains at the exposed surfaces, sometimes resulting in fragmentation and spalling. Mit Hilfe hochauflösender Elektronenmikroskopie werden eine Reihe von YBa2Cu3O7-Proben untersucht vor und nach Aufheizen auf verschiedene Temperaturen zwischen 20 und 450 °C in drei verschiedenen Atmosphären: Sauerstoff, Luft und Vakuum. Durch vergleichende Untersuchungen an denselben Kristallen wird gezeigt, daß sich in allen Atmosphären die Oberfläche bei Temperaturen über 150 °C schnell zersetzt. Unter 150 °C ist die Zersetzungsrate viel geringer; trotzdem zeigen Kristalle, die eine Woche lang der Luft ausgesetzt waren, mehrere Flächendefekte, die den Anfang der Zersetzung anzeigen. Die Zersetzungsreaktion geht vor sich durch Einschieben von zusatzlichen CuO-Ebenen, die zu (CuO)2-Doppellagen zwischen BaO-Ebenen der ursprünglichen Struktur führen. Diese Reaktion verursacht große Gitterdehnungen an der ausgesetzten Oberfläche, die manchmal zu Fragmentierung und Abspaltung führen." @default.
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- W2035321377 date "1988-01-16" @default.
- W2035321377 modified "2023-09-25" @default.
- W2035321377 title "Surface decomposition of superconducting YBa2Cu3O7" @default.
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- W2035321377 doi "https://doi.org/10.1002/pssa.2211050122" @default.
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