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Abstract:
The monofilamentary MgB2/Fe superconducting tapes were fabricated by an ex-situ PIT method. The quantitative phase analysis was carried out using X-ray diffraction and differential thermal analysis on short samples heat treated at 700, 850 and 920°C in vacuum, respectively. The reaction mechanism of MgB2 core during the process of the heat treatment was discussed. The impurity phase of MgO was found in all MgB2 cores and the largest amount was detected near the Fe sheath of the sample annealed at the highest temperature. MgB4 appeares in the inner part of MgB2 core, which is possibly formed by the decomposition of MgB2. A reaction layer (Fe2B) is observed between MgB2 core and Fe sheath, which is decomposed by Fe23B6. The result indicates that the presence of the oxygen inside sheath material is the main obstacle to the further improvement of the phase purity and homogeneity of the ex-situ PIT MgB2/Fe tapes.
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Chinese Journal of Nonferrous Metals
ISSN: 1004-0609
Year: 2006
Issue: 10
Volume: 16
Page: 1698-1704
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30 Days PV: 0