Synthesis and Characterization of Excess Magnesium MgB2 Superconductor under Inert Carbon Environment

Details Synthesis and Characterization of Excess Magnesium MgB2 Superconductor under Inert Carbon Environment Synthesis and Characterization of Excess Magnesium MgB2 Superconductor under Inert Carbon Environment

2009-09-30

arxiv.org/abs/0909.5526v2

Physica C 470, 25-30 (2010)

Physics

Condensed Matter

Superconductivity

21 pages Text + Figs, comments/auggestions (awana@mail.nplindia.ernet.in) (www.freewebs.com/vpsawana)

Scientific paper

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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