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中文摘要：
本文采用化学溶液法制备了在不同热处理条件下葡萄糖掺杂的MgB2块材样品.并对样品的晶体结构及超导电性进行了系统分析.X射线衍射结果表明掺杂样品a轴方向上的晶格参数减小,说明MgB2晶格中部分硼原子被葡萄糖分解后的活性碳原子所替代.此外,在两种不同烧结温度下,5wt%C6H12O6掺杂量对Tc都有较小的抑制,但不可逆场和高场下的载流能力得到了提高.在10K,5T下,掺杂样品的临界电流密度可达104A/cm2,比纯样Jc值大2～3倍,这表明掺杂样品的磁通钉扎性能得到了有效改善.
英文摘要：
In this paper,glucose-doped MgB2 samples at different heat treatment conditions have been prepared by chemical solution method. The effects of 5 wt% C6H12O6 doping on structure,irreversibility field and critical current density of MgB2 are systematically studied by XRD and SQUID. It is found that a small depression in Tc,a certain decrease in the a-axis lattice parameter and grain refinement due to carbon substitution for boron occurs with C6H12O6 doping. As a result,Hirr,flux pining and Jc properties under high field have been significantly improved. The transport Jc of doped samples is still up to 104 orders of magnitude at 10K at 5T field,This value is higher than for un-doped MgB2 by a factor of 2~3. In addition,The flux pinning of doped sample has been effectively enhanced.
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