| 摘要 |
PURPOSE:To readily obtain a superconductor capable of exhibiting superconductivity especially at liquid N2 temperature or above, by temporarily firing a mixed powder of Y oxide powder and Ba hydroxide powder at a temperature below the normal firing temperature, adding copper oxide powder to the resultant processed powder, compacting the blended powder and normally firing the obtained compact. CONSTITUTION:A superconductor which is a sintered compact, consisting of Y, Ba, Cu and O and containing components at atomic ratios of 10<=Y<=60 atom.%, 20<=Ba<=50atom.% and 30<=Cu<=65atom.% in Y-Ba-Cu is produced by the following method. That is powder of Y oxide (Y2O3) and powder of Ba hydroxide [Ba(OH)2] are thoroughly mixed in a ball mill, etc. The resultant mixed powder is then temporarily fired at about 900 deg.C which is a lower temperature than that in normal firing and subsequently finely divided by a wet method. Powder of Cu oxide (CuO) is then added to the obtained processed powder and the resultant blended powder is sufficiently mixed in a ball mill to prepare a granular granulated powder, which is then compacted under about 700kg/cm<2> pressure and normally fired at about 1,050 deg.C temperature in an oxidizing atmosphere to afford the aimed superconductor consisting of the sintered compact. |
