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YBa2Cu3Ox superconducting ceramic containing various oxides were prepared. The superconducting properties such as critic al temperature and current density were measured, and degradation in moisture was discussed. A sample containing 1 to 5 wt% of Ag2O showed increases both in relative density up to 95% of the theoretical density and in the critical current density by 2-3 times than that without addition. The sample containing Ag2O was improved the degradation in moisture compared the without addition sample. A superconducting wire was prepared using Ag pipe and a superconducting powder containing Ag2O. The critical current density of the obtained superconducting wire was 92A/cm2 , about 2 times larger than that with out addition. [Received May 25, 1989; Accepted July 14, 1989] Key-words: Superconducting ceramics, YBa2Cu3Ox ceramics, Superconducting wire

nihon seramikkusu kyoukai gakujyutsu rombunshi/nippon seramikkusu kyōkai gakujutsu rombunshi

Superconducting Properties of YBa&lt;sub&gt;2&lt;/sub&gt;Cu&lt;sub&gt;3&lt;/sub&gt;O&lt;sub&gt;&lt;i&gt;x&lt;/i&gt;&lt;/sub&gt; Ceramics Containing Ag&lt;sub&gt;2&lt;/sub&gt;O and Degradation in Moisture