Aging and environmental effects on YBa2Cu3O6.95 superconductor
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The effect of aging and environmental degrading on a YBa2Cu3O6.95 ceramic superconductor has been studied by x-ray diffraction, scanning electron microscopy, infrared spectroscopy, and electrical resistivity measurements. The superconductor prepared by solid state reaction was well characterized and then exposed to the normal laboratory environment for more than three years. The material showed substantial microstructural degradation with a small decrease in the transition temperature from normal to superconducting state (Tc). IR spectroscopy reveals the presence of water and carbonate. The damage in oxygen content can be restored by reannealing in oxygen for about six hours at 470 °C, but the restoration of exactly the same microstructural and electrical characteristics is not possible.
Keywordsaging cuprates high-temperature superconductors x-ray diffraction
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