逆转掺杂悖论:石墨烯空间嵌套增强了mgb2超导体的晶间连通性,同时诱导最小的转变温度下降。

IF 2.8 4区 材料科学 Q3 MATERIALS SCIENCE, MULTIDISCIPLINARY
Wenbin Jin, Fang Cheng, Nan Liu, Ruxin Song, Qingwen Meng, Zongqing Ma, Qiong Wu, Hongliang Ge
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引用次数: 0

摘要

本研究系统研究了石墨烯(Gr)掺杂、预处理、Cu共掺杂、烧结温度对MgB 2微观结构和超导性能的影响。主要研究结果表明,Gr预处理提高了分散均匀性,但对包覆硼粉的影响很小。微量Cu低温烧结有利于晶粒细化控制;然而,Gr使主要的反应机制转向了固-固(Mg- b)途径,阻碍了Mg的扩散,即使在高温下也会导致不完全反应。系统平衡需要长时间的低温处理或优化掺杂。重要的是,在800°C烧结时,含有5 wt.% Gr + 5 wt.% Cu的样品显示声子态密度(PDOS)峰的半峰全宽度(FWHM)减小。这种降低源于高质量Gr引起的拉伸应变,它抵消了碳取代引起的残余应力和晶格畸变,正如拉曼和Tc测量中减轻的Tc降解所表明的那样。与传统的理解相反,我们提出了一种主要的增强机制,涉及MgB 2, Mg-Cu合金和非晶相在Gr微衬底上的共同生长。这种共同生长在MgB 2基质中形成了致密、互连和空间嵌套的结构,克服了掺杂引起的晶间连通性差,并防止了低场性能抑制。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Reversing the doping paradox: graphene spatial nesting enhances intergranular connectivity while inducing minimal transition temperature degradation in MgB2superconductors.

This study systematically investigates the influence of graphene (Gr) doping, pre-treatment, Cu co-doping, and sintering temperature on the microstructure and superconducting properties of MgB₂. Key findings reveal that Gr pre-treatment enhances dispersion homogeneity but only minimally affects coated boron powders. Low-temperature sintering with trace Cu facilitates finer grain control; however, Gr shifts the dominant reaction mechanism to the solid-solid (Mg-B) pathway, hindering Mg diffusion and causing incomplete reactions, even at elevated temperatures. System equilibrium necessitates prolonged low-temperature treatment or optimized doping. Crucially, the sample with 5 wt.% Gr + 5 wt.% Cu sintered at 800 °C shows a reduction in the full width at half maximum (FWHM) of the phonon density of states (PDOS) peak. This reduction arises from tensile strain induced by high-quality Gr, which counteracts residual stress and lattice distortion caused by carbon substitution, as indicated by mitigated Tc degradation in Raman and Tc measurements. Contrary to conventional understanding, we propose a primary enhancement mechanism involving the co-growth of MgB₂, Mg-Cu alloy, and amorphous phases on Gr micro-substrates. This co-growth fosters a dense, interconnected, and spatially nested architecture within the MgB₂ matrix, overcoming doping-induced poor intergranular connectivity and preventing low-field performance suppression.

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来源期刊
Nanotechnology
Nanotechnology 工程技术-材料科学:综合
CiteScore
7.10
自引率
5.70%
发文量
820
审稿时长
2.5 months
期刊介绍: The journal aims to publish papers at the forefront of nanoscale science and technology and especially those of an interdisciplinary nature. Here, nanotechnology is taken to include the ability to individually address, control, and modify structures, materials and devices with nanometre precision, and the synthesis of such structures into systems of micro- and macroscopic dimensions such as MEMS based devices. It encompasses the understanding of the fundamental physics, chemistry, biology and technology of nanometre-scale objects and how such objects can be used in the areas of computation, sensors, nanostructured materials and nano-biotechnology.
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