Formation of MgB2 at low temperatures by reaction of Mg with B6Si

Details Formation of MgB2 at low temperatures by reaction of Mg with B6Si Formation of MgB2 at low temperatures by reaction of Mg with B6Si

2004-03-03

arxiv.org/abs/cond-mat/0403130v1

Physics

Condensed Matter

Superconductivity

Submitted to Supercond. Sci. Technol

Scientific paper

10.1088/0953-2048/17/7/020

Formation of MgB2 by reactions of Mg with B6Si and Mg with B were compared, the former also producing Mg2Si as a major product. Compared to the binary system, the ternary reactions for identical time and temperature were more complete at 750 C and below, as indicated by higher diamagnetic shielding and larger x-ray diffraction peak intensities relative to those of Mg. MgB2 could be produced at temperatures as low as 450 C by the ternary reaction. Analyses by electron microscopy, x-ray diffraction, and of the upper critical field show that Si does not enter the MgB2 phase.

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