SPECTROSCOPIC STUDIES OF ATMOSPHERIC DEGRADATION OF Y-BA-CU-O SUPERCONDUCTING MATERIALS
- Atmospheric degradation reactions of the ceramic superconducting oxides YBa2Cu3O7 and YBa2Cu4O8 and of (YBa2Cu3O7)1-xAgx (0 < x < 0.5) composites have been studied by infrared reflectance spectroscopy. Buildup of BaCO3 on the sample surfaces is accompanied by development of Reststrahlen features associated with internal modes of the carbonate ion. The rate of degradation of the YBa2Cu4O8 and the silver composites (YBa2Cu3O7)1-xAgx under exposure to water vapour saturated air is much lower than for YBa2Cu3O7 itself. © 1990.
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