The inclusions of Mg–B (MgB12?) as potential pinning centres in high-pressure–high-temperature-synthesized or sintered magnesium diboride
The inclusions of Mg–B (MgB12?) as potential pinning centres in high-pressure–high-temperature-synthesized or sintered magnesium diboride
复制标题
Mg-B (MgB12?) 夹杂物作为高压高温合成或烧结二硼化镁中潜在的钉扎中心
DOI：
10.1088/0953-2048/20/9/s21
复制
发表时间：
2007
影响因子：
3.6
通讯作者：
V. Sverdun
中科院分区：
文献类型：
--
作者：
T. Prikhna;W. Gawalek;Y. Savchuk;T. Habisreuther;M. Wendt;N. Sergienko;V. Moshchil;P. Nagorny;C. Schmidt;J. Dellith;U. Dittrich;D. Litzkendorf;V. Melnikov;V. Sverdun
系统研究了在不添加不同初始粉末的情况下，合成和烧结的高压-高温（2 GPa, 700-1000℃）MgB2的结构和超导特性。在不同的次生相中，鉴定出了化学计量接近MgB12的Mg-B包裹体。随着这些夹杂物数量的增加，临界电流密度增大。因此这些内含物可能是MgB2中可行的钉住中心。最高jc值在零场1300 kA厘米−2 K, 10点780 kA厘米−2在20 K和62 kA厘米−2 35 K和1 T场1200 kA厘米−2 K, 10点515 kA厘米−2在20 K和0.1 kA厘米−2 35 K high-pressure-synthesized镁二硼化物和领域的不可逆性在20 K达到8 T的平均晶粒尺寸计算出x射线检查材料高jc样本是纳米。
A systematic study of the structure and superconductive characteristics of high-pressure–high-temperature (2 GPa, 700–1000 °C)-synthesized and sintered MgB2 without additions from different initial powders was performed. Among various secondary phases Mg–B inclusions with a stoichiometry close to MgB12 were identified. With an increasing amount of these inclusions the critical current density increased. So these inclusions can be feasible pinning centres in MgB2. The highest jc values in zero field were 1300 kA cm−2 at 10 K, 780 kA cm−2 at 20 K and 62 kA cm−2 at 35 K and in 1 T field were 1200 kA cm−2 at 10 K, 515 kA cm−2 at 20 K and 0.1 kA cm−2 at 35 K for high-pressure-synthesized magnesium diboride and the field of irreversibility at 20 K reached 8 T. The average grain sizes calculated from x-ray examinations in materials having high jc were 15–37 nm.