| 摘要 |
PURPOSE:To sinter the compact of the raw powder for an oxide superconductor at low temp. and to obtain the title oxide superconductor having a high critical current density by heating the surface of the compact at a specified high temp. for a specified time prior to the sintering of the compact at a specified temp. in an oxidizing atmosphere. CONSTITUTION:The raw powder of the elements constituting an oxide supercon ductor is pressed into a compact, the surface of the compact is heated at 950-1100 deg.C for 1-60min in an oxidizing atmosphere, and then the compact is sintered at <195 deg.C. The oxide superconductor is expressed by the general formu la LnBa2Cu3Ox (Ln is rare-earth elements). When the surface is heated at <950 deg.C, the compact is not sintered. The crystal is decomposed at >1100 deg.C, and the characteristic is deteriorated. A heating effect is not produced at the heating time of <1min, and the compact is decomposed and molten at >60min. In addition, the surface is directly heated by IR, etc. |
