Synthesis and Processing of $Mg{B}_2$ powders and wires

Abstract

Sintered powders and wires of superconducting $Mg{B}_2$ have been fabricated under a variety of conditions in order to determine details of the diffusion of the $Mg$ into $B$ and to study the types of defects that arise during growth. For samples prepared by exposure of boron to $Mg$ vapor at $950^{\circ }C$, the conversion of particles of less than $100\mu m$ size particles to $Mg{B}_2$ is complete in about $2h$. The lattice parameters of the $Mg{B}_2$ phase determined from X-ray are independent of the starting stoichiometry and the time of reaction. Wire segments of $Mg{B}_2$ with very little porosity have been produced by reacting $141\mu m$ diameter boron fibers in an atmosphere of excess $Mg$ vapor at $950^{\circ }C$. Defects in the reacted fibers are predominantly the voids left as the boron is converted to $Mg{B}_2$.

References in corpus (4)

• Strongly linked current flow in polycrystalline forms of the new superconductor MgB2
• Boron Isotope Effect in Superconducting MgB${}_2$
• Superconductivity in Dense $Mg{B}_2$ Wires
• Thermodynamic and Transport Properties of Superconducting $M{g}^{10}{B}_2$

Cited by in corpus (8)

• Specific heat in the superconducting and normal state (2-300 K, 0-16 Teslas), and magnetic susceptibility of the 38-K superconductor MgB2: evidence for a multicomponent gap
• Correlation between the residual resistance ratio and magnetoresistance in MgB2
• Effects of stoichiometry, purity, etching and distilling on resistance of MgB2 pellets and wire segments
• Flux dynamics and vortex phase diagram of the new superconductor $Mg{B}_2$
• Magnetization studies on superconducting MgB${}_2$ - lower and upper critical fields and critical current density
• Titanium additions to MgB2 conductors
• Electrical transport properties of bulk MgB2 materials synthesized by the electrolysis on fused mixtures of MgCl2, NaCl, KCl and MgB2O4
• Effects of Neutron Irradiation on Carbon Doped MgB2 Wire Segments