Analysis of interdiffusion between SmFeAsO0.92F0.08 and metals for exsitu fabrication of superconducting wire

M. Fujioka, M. Matoba, T. Ozaki, Y. Takano, H. Kumakura, Y. Kamihara

研究成果: Article査読

8 被引用数 (Scopus)


To find good sheath materials that react minimally with the superconducting core of iron-based superconducting wires, we investigated the reaction between polycrystalline SmFeAsO0.92F0.08 and the following seven metals: Cu, Fe, Ni, Ta, Nb, Cr and Ti. Each of the seven metals was prepared as a sheath-material candidate. The interfacial microstructures of SmFeAsO 0.92F0.08 and these metal-sheath samples were analysed by an electron probe microanalyzer after annealing at 1000 °C for 20h. Amongst the seven metal-sheath samples, we found that Cu was the best, because it reacted only very weakly with polycrystalline SmFeAsO0.92F 0.08. Moreover, Cu is essential for superconducting wires as a stabilizing material. Metal sheaths made of Fe and Ni do not give rise to reaction layers, but large interdiffusion between these metals and polycrystalline SmFeAsO0.92F0.08 occurs. In contrast, metal sheaths made of Ta, Nb, Cr and Ti do form reaction layers. Their reaction layers apparently prevent electric current from flowing from the sheath material to the superconducting core. In general, through this research, Cu will be expected to be suitable not only as a stabilizing material but also as a sheath material for superconducting Sm-1111 wire fabricated by the exsitu PIT method.

ジャーナルSuperconductor Science and Technology
出版ステータスPublished - 2011 7

ASJC Scopus subject areas

  • セラミックおよび複合材料
  • 凝縮系物理学
  • 金属および合金
  • 電子工学および電気工学
  • 材料化学


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