Pinning in $\hbox{MgB}_{2}$- and YBaCuO-Based Superconductors: Effect of Manufacturing Pressure and Temperature
Pinning in $\hbox{MgB}_{2}$- and YBaCuO-Based Superconductors: Effect of Manufacturing Pressure and Temperature
复制标题
$hbox{MgB}_{2}$- 和 YBaCuO 基超导体中的钉扎：制造压力和温度的影响
DOI：
10.1109/tasc.2013.2237736
复制
发表时间：
2013
影响因子：
1.8
通讯作者：
A. Shaternik
中科院分区：
文献类型：
--
作者：
T. Prikhna;M. Eisterer;H. Weber;W. Gawalek;X. Chaud;V. Sokolovsky;V. Moshchil;A. Kozyrev;V. Sverdun;R. Kuznietsov;T. Habisreuther;M. Karpets;V. Kovylaev;J. Noudem;J. Rabier;A. Joulain;W. Goldacker;T. Basyuk;V. Tkach;J. Dellith;C. Schmidt;A. Shaternik
块状 MgB<sub>2</sub> 和 YBaCuO 基材料是具有竞争力的应用候选材料。通过高温高压制备方法可以显着改善两种化合物的性能。在 0.1 MPa 至 2 GPa 的压力下，随着制造温度从 800<sup>°</sup>C 升高至 1050<sup>°</sup>C，MgB<sub>2</sub> 基材料中晶界钉扎向点钉扎的转变与中低磁场中临界电流密度的增加以及材料结构中硼和氧的重新分布密切相关。随着制造温度升高（至2 GPa），不连续的富氧层转变为明显的Mg-B-O夹杂物，并且高硼化物MgB<sub>X</sub> (X>;2)夹杂物的尺寸和数量减少。添加 Ti 或 SiC 可以增强氧和硼重新分布的效果。熔融织构YBa<sub>2</sub>Cu<sub>3</sub>O<sub>7 - δ</sub>（MT-YBaCuO）在氧气压力（16 MPa）下发生氧化反应，可以将氧化温度从440℃提高到700-800℃，从而增加Y123基体中的孪晶密度，减少位错、堆垛层错和密度。微裂纹，从而导致临界电流密度 <i>J</i><sub>c</sub> 和捕获磁场的增加。在MT-YBaCuO中，已经实现了几乎自由形式的位错和堆垛层错，孪晶密度为22-35 μm<sup>-1</sup>，<i>J</i><sub>c</sub>为100 kA/cm<sup>2</sup>（77 K，0 T），并通过实验证明了Y123中孪晶对于钉扎的重要性。
Bulk MgB<sub>2</sub>- and YBaCuO-based materials are competitive candidates for applications. The properties of both compounds can be significantly improved by high temperature-high pressure preparation methods. The transformation of grain boundary pinning to point pinning in MgB<sub>2</sub>-based materials with increasing manufacturing temperature from 800 to 1050<sup>°</sup>C under pressures from 0.1 MPa to 2 GPa correlates well with an increase in critical current density in low and intermediate magnetic fields and with the redistribution of boron and oxygen in the material structure. As the manufacturing temperature increases (to 2 GPa), the discontinuous oxygen-enriched layers transform into distinct Mg-B-O inclusions, and the size and amount of inclusions of higher borides MgB<sub>X</sub> (X>;2) are reduced. The effect of oxygen and boron redistribution can be enhanced by Ti or SiC addition. The oxygenation of melt-textured YBa<sub>2</sub>Cu<sub>3</sub>O<sub>7 - δ</sub> (MT-YBaCuO) under oxygen pressure (16 MPa) allows one to increase the oxygenation temperature from 440°C to 700-800°C, which leads to an increase of the twin density in the Y123 matrix and to a decrease of dislocations, stacking faults, and the density of microcracks, and as a result, to an increase of the critical current density, <i>J</i><sub>c</sub>, and the trapped magnetic field. In MT-YBaCuO, practically free form dislocations and stacking faults and with a twin density of 22-35 μm<sup>-1</sup>, <i>J</i><sub>c</sub> of 100 kA/cm<sup>2</sup> (at 77 K, 0 T) has been achieved, and the importance of twins in Y123 for pinning was demonstrated experimentally.
超导线材和超导带的基础知识
DOI：
--
发表时间：
2017
期刊：
影响因子：
--
作者：
S. Kobayashi;S. Yamada;K. Arima and K. Hamaya;B. M. Kurkoski;Takanobu Kiss
通讯作者：
Takanobu Kiss