利用交流磁化率无接触测量Bi-2223/Ag高温超导带材的E-J特性  

Contact-Free Measurement of E-J Characteristics in Bi-2223/Ag Superconducting Tapes by Means of AC Susceptibility

作　　者：瞿体明[1,2] 李小汾[1] 顾晨[1] 陈笃行 韩征和[1] 曾攀[1,2] 

机构地区：[1]清华大学,北京100084 [2]先进成形制造教育部重点实验室,北京100084 [3]ICREA and Grupd'Electromagnetisme,Departament de Fisica

出　　处：《稀有金属材料与工程》2008年第A04期301-305,共5页Rare Metal Materials and Engineering

基　　金：国家自然科学基金重点项目(50635050)

摘　　要：对Bi-2223/Ag超导带材的交流磁化率(χ=χ′+jχ″)随交流磁场的峰值(μ0Hm=0.01～60mT)以及频率(f=1～540Hz)的变化进行了系统的研究,发现通过在不同频率下测量χ″最大值所对应的磁场Hm(χ″),结合临界态模型的假设,可以对带材的E-J特性进行推导。在单芯带材情况下,所得结果和由传输测量得到的E-J关系相符合;而在多芯带材情况下则需要对磁化电流进行修正。这可以作为一种非接触测量单芯Bi-2223/Ag带材E-J特性的方法。The ac susceptibility （χ=χ′＋jχ″） of Bi-2223/Ag superconducting tapes as a function of applied field amplitude （μ0Hm = 0.01～60 mT） and frequency （f = 1～540 Hz） was studied systematically. It was found that the χ″ peak position （Hm（χ″）） increased with f increasing, which could be used to calculate the E-J characteristic of tapes, if considering the critical state model. The calculated magnetic E-J curve had a good conformation with the result of transport measurements in case of monofilament tapes. The method proposed in this article could be used for contact-free measurement of E-J characteristics in Bi-2223/Ag superconducting tapes.

关 键 词：交流磁化率 临界电流 BI-2223/AG超导带材 无接触 

分 类 号：TM26[一般工业技术—材料科学与工程]