高温超导氧化物YBCO中添加BaF2的研究

Study on HTS YBCO Adding BaF2

摘要:

研究了BaF2添加对高温超导氧化物YBCO先驱粉末的热力学行为及对织构组织和超导性能的影响。DTA分析结果表明，添加BaF2使YBCO先驱粉末升温过程中的包晶分解温度有所降低，同时使YBCO的包晶反应温度降低，对织构生长的温度区间影响不是很明显。SEM测量发现，YBCO的显微组织结构基本不变，说明BaF2的添加没有显著影响YBCO的织构生长和Y211在基体中的分布。磁化率测景表明，当BaF2含量小于10％（质量分数）时超导转变温度略有降低。

Abstract:

The effects of adding BaF2 on the thermodynamic behavior of YBCO precursory powders,melt-textured microstructure and properties of YBCO superconductors have been investigated.The differential thermal analysis(DTA) results showed that the peritectic decomposition and reaction temperature of YBCO precursory powder were lowered when BaF2 is added,but the temperature range for melting texture growth did not significantly change by the addition of BaF2.The microstructures of the doped samples have been observed by scanning electron microscopy(SEM).The results show that the appropriate addition amounts of BaF2 were not affect the microstructure of YBCO and the distribution of Y211 in the matrix.The transition temperature Tc was measured by susceptibility method without obviously decrease for the samples with an addition amount lower than 10wt% of BaF2.