In situ resistance measurement of superconducting MgB2 in flowing argon atmosphere

In situ resistance measurement of MgB2 sample was performed in flowing argon atmosphere. This set of measuring curve was compared with the in situ resistance measurement result of MgB2 sample performed in vacuum. This measurement result presents a resistance decreasing taken as a whole as increasing...

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Bibliographic Details
Published in:Physica. C, Superconductivity Superconductivity, 2003-04, Vol.386 (1-4), p.653-656
Main Authors: Feng, Qing-rong, Chen, Xun, Wang, Yu-hao, Wang, Xin, Xiong, Guang-cheng, Gao, Zheng-xiang
Format: Article
Language:English
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Summary:In situ resistance measurement of MgB2 sample was performed in flowing argon atmosphere. This set of measuring curve was compared with the in situ resistance measurement result of MgB2 sample performed in vacuum. This measurement result presents a resistance decreasing taken as a whole as increasing temperature from room temperature to 800DGC, and it indicated that the Mg powder began to melt at about 530DGC. At this temperature the resistance values of MgB2 sample presented a sharp down, and it is lower than MgB2 sample prepared in vacuum conditions that appeared at 638DGC. This indicated that the phase formation of MgB2 in argon atmosphere was at lower temperature than in vacuum.
ISSN:0921-4534
DOI:10.1016/S0921-4534(02)02184-6