This paper reports a novel process for preparing well-textured bulk Y 1 Ba 2 Cu 3 O 7-δ (YBCO) superconductors. It is found that the addition of ZrO 2 has been very effective in acting as the nucleation sites for promoting the oriented growth of superconducting YBCO during peritectic solidification. Extended regions of well-textured YBCO grains with the superior superconducting properties of the YBCO bulk are readily obtained by a single-step melt process at much lower process temperatures, as compared to other processes such as melt-texturing-growth (MTG) and melt-quench-melt-growth (MQMG) previously reported. At 77 K, the plate-like Josephson weak-link behaviors observed in pure melt-processed YBCO have been effectively eliminated by the present method, indicating that the coherency between the spherulitic superconducting YBCO grains may have been greatly improved ZrO 2 additions. It is anticipated that, with further optimizations on process parameters, the present much simplified process will have important implications for obtaining the much desired grain structures for practical applications of this material.
|Number of pages||8|
|Journal||Proceedings of the National Science Council, Republic of China, Part A: Physical Science and Engineering|
|State||Published - 1 May 1995|