Superior MgB_2 Superconducting Wire Performance through Oxygen-Free Pyrene Additive
Superior MgB_2 Superconducting Wire Performance through Oxygen-Free Pyrene Additive
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通过无氧芘添加剂实现卓越的 MgB_2 超导线性能
DOI：
10.1143/apex.5.013101
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发表时间：
2012
影响因子：
2.3
通讯作者：
et al
中科院分区：
文献类型：
--
作者：
Minoru Maeda;Jung Ho Kim;Yoon-Uk Heo;et al
进一步提高mgb2线的临界电流密度（J c）性能有很大的潜力。本文以无氧芘为掺杂剂制备了mgb2金属丝，并系统地研究了jc对电场和温度的依赖性。此外，烧结温度、结构参数、微观结构和超导性能之间存在很强的相关性。以芘为添加剂，采用低温烧结工艺，获得了较高的晶格畸变。这是由空位形成引起的，第一性原理计算证实了这一点。微观缺陷引入杂质散射，导致不可逆性场和jc增强。
There is great potential to further enhance the critical current density (J c) performance of MgB 2 wires. Herein, MgB 2 wires were fabricated by using oxygen-free pyrene as dopant, and field and temperature dependences of J c were systematically evaluated. In addition, a strong correlation among sintering temperature, structural parameters, microstructure, and superconducting performance was established. High lattice distortion was obtained by using pyrene as an additive as well as by using a low-temperature sintering process. This arises from vacancy formation, as confirmed by first-principles calculations. The microscopic defects introduce impurity scattering, resulting in the enhancement of the irreversibility field and J c.