MgB₂/Fe superconducting tapes made using mechanically milled powders in Ar and H₂ atmospheres

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• 作者：T. Kondo ; P. Badica ; Y. Nakamori ; S. Orimo ; K. Togano ; G. Nishijima ; K. Watanabe
• 关键词：MgB₂-tapes ; Mechanical milling ; J_C ; Microstructure ; Reactivity
• 刊名：Physica C
• 出版年：2005
• 出版时间：1 October 2005
• 年：2005
• 卷：426-431
• 期：Complete
• 页码：1231-1237
• 全文大小：454 K

文摘

Fe-sheathed tapes of MgB₂ with addition of SiC have been prepared by the powder-in-tube (PIT) method using a powder mixture mechanically milled in an argon or hydrogen atmosphere. The reactivity of the component powders in the mixtures, Mg, B and SiC, was significantly enhanced by mechanical milling, so that MgB₂ formed faster than in tapes fabricated from a hand-milled mixture. At the same time the number of impurity phases was higher, and the impurity phases of Mg₂Si and Fe₂B were observed only in these tapes. Mechanical milling also induced a lower quality of MgB₂, especially for tapes produced from powders milled in a hydrogen atmosphere, with a significant influence on the values of the critical temperature T_C and critical field, J_C.