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Effects of B Powder on the MgB2 Superconductor Prepared by Two-Step PIT
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    Abstract:

    MgB2 superconductors were prepared by two-step PIT with B (crystalline or amorphous) and Mg as starting materials. The first step was mixing B (crystalline or amorphous) and Mg with the molar ratio of Mg:B=1:4. For the doping samples, 5wt% and 8wt% SiC were added to the mixture. Pressed pellets were treated at 900 oC for 30 min or 800 oC for 1 h. The second step was adding Mg to get the molar ratio of Mg:B=1:2. The tubes filled with the ground powders were treated at 750 oC for 2.5 h. The phase identities and the microstructure were investigated by X-ray diffraction (XRD) and Scanning Electronic Microscopy (SEM), respectively. Voltage dependence of the current of MgB2 wire was measured by a standard four-probe method. The results demonstrate that lots of MgB4 in low energy is synthesized by crystalline B and Mg at the first step. The sample prepared from crystalline B exhibits an excellent grain connection and stable I-V characteristics.

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[Shan Di, Wang Qingyang, Liu Guoqing, Xiong Xiaomei, Li Jinshan, Yan Guo, Zhou Lian. Effects of B Powder on the MgB2 Superconductor Prepared by Two-Step PIT[J]. Rare Metal Materials and Engineering,2013,42(6):1278~1281.]
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  • Received:June 20,2012
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