Optimization of intergrain connection in high-temperature superconductor Bi2Sr2CaCu2Ox
Optimization of intergrain connection in high-temperature superconductor Bi2Sr2CaCu2Ox
复制标题
高温超导体Bi2Sr2CaCu2Ox晶间连接的优化
DOI：
10.1088/1674-1056/24/7/077401
复制
发表时间：
2015
期刊：
影响因子：
--
通讯作者：
张平祥
中科院分区：
文献类型：
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作者：
李成山;张胜楠;郝清滨;马小波;卢天倪;张平祥
提出了一种改进的火花等离子烧结（SPS）技术，用于制备具有良好晶间连接的bi2sr2cacuox （Bi-2212）超导块体。系统分析了改性SPS工艺对复合材料显微组织、晶间连接及相关超导性能的影响。改进后的SPS工艺不仅可以提高体样的最终密度，而且可以改善体样的织构结构。获得了干净的晶界，而非晶间非晶层。因此，晶粒间性能得到明显改善。由于改进的SPS工艺获得的Bi-2212块体的晶间连接更好，磁通钉接性能更强，临界电流密度大大提高。所获得的改进意味着改进的SPS技术有可能用于增强Bi-2212带的超导性能。
A modified spark plasma sintering (SPS) technique was developed for the fabrication of Bi2Sr2CaCu2Ox (Bi-2212) superconducting bulks with better intergrain connections. The influences of the modified SPS process on the microstructures, intergrain connections, and related superconducting properties were systematically analyzed. The modified SPS process can not only increase the final density of the bulk samples but also enhance the texture structures. Clean grain boundaries were obtained instead of the intergrain amorphous layers. Therefore the intergranular properties were obviously improved. Due to the better intergrain connections and the stronger flux pinning properties, the critical current densities of the Bi-2212 bulks obtained via the modified SPS process were greatly increased. The obtained improvements imply the possibility for the modified SPS technique to be used for enhancing the superconducting properties of the Bi-2212 tapes.