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晶界对GdBCO超导块材磁悬浮力的影响

发表时间:2017-07-13  浏览量:162  下载量:62
全部作者: 张春艳,杨万民
作者单位: 陕西师范大学物理学与信息技术学院
摘 要: 根据单畴REBCO(其中,RE为稀土元素,即Y、Gd、Sm、Nd等)超导块材具有5个亚畴区的特征,采用Auto CAD软件,在籽晶晶向、间距、夹角相同的情况下,模拟出了单籽晶和多籽晶(n=1,2,3,4)REBCO超导块材各个畴区的晶体形貌及晶界变化规律。采用Gd+011顶部籽晶熔渗生长(top-seeded infiltration and grouth,TSIG)技术,成功制备出一组直径30 mm、籽晶数不同的GdBCO超导块材。根据Auto CAD绘制的关于多籽晶样品晶界变化图,推测样品的磁悬浮力大小与样品的晶界和亚畴界有关,样品的晶界和亚畴界越多,感应环流越不易通过,样品的超导性能就越差。通过对样品的微观结构和临界电流密度进行深入研究、分析,并结合样品磁悬浮力的测试结果,发现实测结果与本文推测结果完全一致。
关 键 词: 凝聚态物理学;多籽晶;GdBCO块材;临界电流密度;微观结构;磁悬浮力
Title: Effect of grain boundary on levitation forces of GdBCO superconducting bulks
Author: ZHANG Chunyan, YANG Wanmin
Organization: School of Physics and Information Technology, Shaanxi Normal University
Abstract: Based on the feature of five secondary domains of the single domain REBCO superconducting bulks (RE=Y, Gd, Sm, Nd, et al.), the crystal morphology and grain boundary change rule of the single seed crystal and multi-seed crystal (n=1, 2, 3, 4) REBCO superconducting bulks are simulated in each domain by using Auto CAD software under the condition of same seed orientation, seed distance and seed angle. By Gd+011 top-seed infiltration and growth technique, a group of GdBCO superconducting bulks of 30 mm in diameter with different numbers of seeds (n=1, 2, 3, 4) have been fabricated successfully. Based on grain boundary variation chart of multi-seed crystal samples drew by Auto CAD, we speculate that the grain and domain boundary will impact the levitation force of GdBCO superconducting bulks. Experiment results indicate that the more available grain boundary is, the worse critical current of superconducting properties is. The sample’s microstructure, critical current density and the test results of the magnetic levitation force are found in exact accordance with our projections after an in-depth research and analysis.
Key words: condensed matter physics; multi-seed crystal; GdBCO bulks; critical current density; microstructure; levitation force
发表期数: 2017年7月第13期
引用格式: 张春艳,杨万民. 晶界对GdBCO超导块材磁悬浮力的影响[J]. 中国科技论文在线精品论文,2017,10(13):1499-1505.
 
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