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扭转了兴奋剂悖论:石墨烯空间嵌套增强了颗粒间的连接性,同时在MgB2超导体中诱导了最小的过渡温度降解

Jin Wenbin¹, Cheng Fang¹, Liu Nan²

¹Materials and Chemistry College, International Exchange and Cooperation Office of China Jiliang University, Hangzhou, People's Republic of China.

|September 30, 2025

概括

在MgB2中合石墨烯可以通过诱导拉伸应变来增强超导特性,从而改善微观结构. 优化的兴奋剂和低温烧结创造了一个独特的相互连接的架构,克服了性能抑制.

科学领域:

材料科学材料科学材料科学
超导电性超导电性超导电性
纳米技术纳米技术

背景情况:

二化物 (MgB2) 是一个有前途的超导体.
兴奋剂MgB2对于增强其超导特性至关重要.
石墨烯兴奋剂对MgB2的微观结构和性能带来了独特的挑战和机会.

研究的目的:

调查预处理的石墨烯兴奋剂对MgB2微观结构和超导性的影响.
分析预处理,兴奋剂度 (石墨烯和) 和烧结温度的影响.
阐明石墨烯对MgB2特性影响背后的机制.

主要方法:

在MgB2中对预处理的石墨烯兴奋剂进行系统的调查.
不同的石墨烯和铜兴奋剂含量和烧结温度.
对微观结构变化和超导性质的分析 (例如,Tc,状态的声子密度).
拉曼光谱用于应变和格子扭曲分析.

主要成果:

石墨烯预处理改善了分散性,但对粉的影响有限.
使用铜的低温烧结有助于控制谷物.
石墨烯改变了反应机制,可能阻碍了Mg的扩散.
在800°C的优化剂 (5重量%Gr + 5重量%Cu) 减少了由于石墨烯诱导的拉伸应变而导致的声子峰幅.
应变可以抵消剩余应力和碳替代效应,减轻Tc降解.

结论:

在特定条件下,石墨烯兴奋剂可以增强MgB2的超导特性.
一个拟议的机制涉及在石墨烯微基基板上共同生长,形成密集的,相互连接的架构.
这种架构克服了兴奋剂诱导的细胞间连接问题和低场性能抑制.

关键词:

超导体MgB2 超导体晶体间的连接性晶体间的连接性微观结构的微观结构预先处理的石墨烯进行了兴奋剂.烧结温度是烧结的温度.

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