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Formation of MgB 2 at low temperatures by reaction of Mg with B 6 Si

2004; IOP Publishing; Volume: 17; Issue: 7 Linguagem: Inglês

10.1088/0953-2048/17/7/020

1361-6668

L. D. Cooley, Kyongha Kang, Robert F. Klie, Qiang Li, A. R. Moodenbaugh, R. L. Sabatini,

Magnesium Alloys: Properties and Applications

Formation of MgB 2 by reactions of Mg with B 6 Si and Mg with B were compared, the former also producing Mg 2 Si 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.MgB 2 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 MgB 2 phase.