- The Phase Analysis of MgB2 Fabricated by Spark Plasma Sintering after Ball Milling
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Deuk-Kyun Kang, Sung-Hyun Choi, In-Shup Ahn
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J Korean Powder Metall Inst. 2008;15(5):371-377.
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DOI: https://doi.org/10.4150/KPMI.2008.15.5.371
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 Abstract
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- This paper deals with the phase analysis of MgB_2 bulk using spark plasma sintering process after ball milling. Mg and amorphous B powders were used as raw materials, and milled by planetary-mill for 9 hours at argon atmosphere. In order to confirm formation of MgB_2 phase, DTA and XRD were used. The milled powders were fabricated to MgB_2 bulk at the various temperatures by Spark Plasma Sintering. The fabricated MgB_2 bulk was evaluated with XRD, EDS, FE-SEM and PPMS. In the DTA result, reaction on formation of MgB_2 phase started at 340°C. This means that ball milling process improves reactivity on formation of MgB_2 phase. The MgB_2 MgO and FeB phases were characterized from XRD result. MgO and FeB were undesirable phases which affect formation of MgB_2 phase, and it's distribution could be confirmed from EDS mapping result. Spark Plasma Sintered sample for 5 min at 700°C was relatively densified and it's density and transition temperature showing super conducting property were 1.87;g/cm3 and 21K.
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