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Effect of nano-Al2O3 doping on formation and superconductivity of bulk MgB2

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Abstract

Bulk materials of MgB2 have been prepared with the stoichiometry of MgB2(Al2O3) x (x = 0, 2, 5, 10 and 20% nano-Al2O3 powders), by using solid-state reaction route. All samples were sintered at 750 °C for 30 min in a calorimeter to monitor the sintering reaction process. It is found that the onset temperatures of reaction between Mg and B powders increase significantly with increasing the amount of Al2O3. However, the reaction time is shortened for the nano-Al2O3 powders can effectively activate the reaction as a catalyst. The critical transition temperature decreases from 38.5 to 31.6 K, and the corresponding temperature window becomes narrow (less than 2.6 K). Furthermore, the amount of MgO impurity was found to increase with the increase of Al2O3, which probably indicates that partial Mg was replaced by Al.

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Acknowledgments

The authors are grateful to the Natural Science Foundation of Tianjin City for grant and financial support.

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Authors and Affiliations

  1. Department of Technology, Tianjin Pipe (Group) Corporation, 300301, Tianjin, People’s Republic of China

    Qing Zhi Shi & Ze Sheng Yan

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  1. Qing Zhi Shi
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  2. Ze Sheng Yan
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Correspondence to Ze Sheng Yan.

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Shi, Q.Z., Yan, Z.S. Effect of nano-Al2O3 doping on formation and superconductivity of bulk MgB2 . J Mater Sci: Mater Electron 21, 656–658 (2010). https://doi.org/10.1007/s10854-009-9972-6

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  • DOI: https://doi.org/10.1007/s10854-009-9972-6

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