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The instability of the YBaCuO superconductor and the recovery of superconducting characteristics

We have studied the instability of YBa 2 Cu 3 O 7 superconductors by x-ray diffraction, IR absorption, scanning electron microscopy and superconductivity characteristics (T c ,J c ). The results show that the instability of YB 2 Cu 3 O 7 is essentially a chemical reaction and the process is reversible. The major factors which induce the instability are water and carbon dioxide in the ambient atmosphere of YBa 2 Cu 3 O 7 . For the YBa 2 Cu 3 O 7 superconductor, by protecting the sample from H 2 O and Co 2 the instability can be avoided, and by adopting re-sintering T c and J c can be recovered