Superconductivity in Multi-Phase Mg-B-O Compounds
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- 作者：Tatiana Prikhna ; Wolfgang Gawalek ; Michael Eisterer ; Harald W. Weber ; Jacques Noudem ; Vladimir Sokolovsky ; Xavier Chaud ; Viktor Moshchil ; Myroslav Karpets ; Valeriy Kovylaev ; Alex ; r Borimskiy ; Vasiliy Tkach ; Artem Kozyrev ; Roman Kuznietsov ; Jan Dellith ; Christa Shmidt ; Tetiana Basyuk ; Doris Litzkendorf ; Friedrich Karau ; Ulrich Dittrich ; et al.
- 关键词：Magnesium diboride ; higher magnesium borides ; nanostructure ; critical current density ; pinning force
- 刊名：Physics Procedia
- 出版年：2012
- 出版时间：2012
- 年：2012
- 卷：36
- 期：Complete
- 页码：475-478
- 全文大小：358 K
文摘
Structures of MgB2-based materials manufactured under pressure (up to 2 GPa) by different methods having high superconducting performance and connectivity are multiphase and contain different Mg-B-O compounds. Some oxygen can be incorporated into MgB2 and boron into MgO structures, MgBx (X=4-20) inclusions contain practically no oxygen. Regulating manufacturing temperature, pressure, introducing additions one can influence oxygen and boron distribution in the materials and thus, affect the formation, amount and sizes of Mg-B-O and MgBx inclusions and changing type of pinning, pinning force and so affect critical current density jc. The boron concentration increase in initial Mg and B mixture allows obtaining sample containing 88.5 wt % of MgB12 with TC of 37.4 K (estimated magnetically).