Low Temperature Fabrication of MgB2

Abstract

We report the fabrication of MgB2 with bulk superconducting properties by conventional solid state methods at temperatures as low as 550 C. Mg deficiencies of the type Mg1-xB2 were tested. Tc was found to decrease by about 1K at large x, though the amount of non-stoichiometry, if any, is likely to be very small. For specific processing conditions, indications of the 25-30 K transition often seen in thin films were seen in the bulk materials. The lower temperature transition may be associated with the grain boundaries. These results indicate that it should be possible to fabricate MgB2 with bulk properties in in-situ thin films at temperatures of 600 C or less.

3 pages, 5 figures (submitted to Journal of Applied Physics)

References in corpus (7)

• Beyond Eliashberg superconductivity in MgB2: anharmonicity, two-phonon scattering, and multiple gaps
• Thin Film Magnesium Boride Superconductor with Very High Critical Current Density and Enhanced Irreversibility Field
• Thermodynamic and Transport Properties of Superconducting $M{g}^{10}{B}_2$
• Enhancement of the high-field critical current density of superconducting MgB2 by proton irradiation
• Thermodynamics of the Mg-B system: Implications for the deposition of MgB2 thin films
• Experimental study of MgB2 decomposition
• Growth mechanism of superconducting MgB2 films prepared by various methods

Cited by in corpus (8)

• Critical Current Density and Resistivity of MgB2 Films
• Study of Ag and Cu / MgB2 powder-in-tube composite wires fabricated by in-situ reaction at low temperature
• Crystal growth and characterization of MgB2: Relation between structure and superconducting properties
• The Reactivity of MgB2 with Common Substrate and Electronic Materials
• Influence of Mg deficiency in MgB2 single crystals on crystal structure and superconducting properties
• Improved Current Densities in MgB2 By Liquid-Assisted Sintering
• Formation of MgB2 at low temperatures by reaction of Mg with B6Si
• Electrical transport properties of bulk MgB2 materials synthesized by the electrolysis on fused mixtures of MgCl2, NaCl, KCl and MgB2O4