Growth and characterization of YBa₂(Cu_1−XA_X)₃O_7−δ (A=Mg, Zn, Ni) bars as switching elements for faul

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• 作者：Mendoza ; E. ; Teva ; J. ; Puig ; T. ; Granados ; X. ; Obradors ; X.
• 关键词：74.72.Bk ; 74.60.Jg ; 74.62.Dh ; 84.70.+p ; Bulk YBCO ; Current limitation ; High current characterization ; Doping
• 刊名：Physica C
• 出版年：2002
• 出版时间：August, 2002
• 年：2002
• 卷：372-376
• 期：Part 3
• 页码：1622-1625
• 全文大小：101 K

文摘

Single domain melt textured YBCO ceramics have a high interest as switching elements for fault current limiters. The high amount of energy accumulated in the hot spot together with the low thermal conductivity leads to material damage. A reduction of the critical current density (J_C) is a way to minimise the accumulated energy in the hot spot. Our approach for the reduction of the J_C is to dope the material to lower the T_C. Single domain melt textured bars have been obtained by the Bridgman method with different dopants. Pulsed currents have been applied to the samples in order to study the quench current that induces transition to the normal state. This measurements show that with the appropriate dopant level, and thus, by tuning the optimal J_C, it is possible to get a transition of the 100 % of the superconducting volume.