惰性碳环境下过量镁MgB2超导体的合成与表征
Synthesis and Characterization of Excess Magnesium MgB2 Superconductor under Inert Carbon Environment
摘要：
研究了重掺Mg的MgB_2超导体的结构、输运和磁性。采用新的方法在加压碳气氛和流动氩气气氛中合成了样品。观察到所使用的过量镁起双重作用：一个是在合成过程中防止Mg损失并因此维持MgB 2相的化学计量，第二个是可能在MgB 2晶粒周围形成Mg环境以给出延展性和致密结构。过量的Mg还通过进入孔隙并在那里通过使绝缘结最小化来改善晶粒连通性。
英文摘要：
The structural, transport and magnetic properties of MgB2 superconductor heavily blended with Mg is studied. The samples are synthesized with a new approach in both, pressed carbon environment and in flowing argon. The excess magnesium used is observed to play dual role: one being the prevention of Mg losses during the synthesis process and hence maintaining the stoichiometry of MgB2 phase, and second being the formation of Mg milieu probably all around the MgB2 grains to give a ductile and dense structure. Excess Mg also improves the grain connectivity by going in to the pores and there by minimizing the insulating junctions.
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