To employ Al stabilizer on Fe sheathed MgB2 wire the hot aluminizing technique was used. The present technique allows us to form MgB2 superconductor by an in-situ reaction technique and apply Al stabilizer simultaneously, because the processing temperature of MgB2 is similar to the melting temperature of Al. Two types of Fe sheathed MgB2 wires—“reacted” and “green” (unreacted)—were immersed in ...

Superconducting MgB2 crystallites having a size up to 3 X 2 X 1 mm have been grown using a liquidassisted-sintering process under atmospheric pressure of argon. The magnetization measurements have been carried out on MgB2 samples to determine upper critical field, critical current density and irreversibility line. The obtained values of critical current density and upper critical field were ~10...

Composites consisting of Mg and MgB2 phases were fabricated by liquid-metal infiltration following two routes. First, a preform of MgB2 powders was pressure infiltrated at 800 °C with liquid Mg, which was subsequently solidified. Second, a preform of B powders was pressure infiltrated with liquid Mg at 700 °C, resulting in partial, in situ formation of the MgB2 phase. Subsequent annealing at 95...

The superconductivity at 39 K discovered in MgB2 among simple binary chemical composition attracted much interest in its fabrication techniques and practical applications [1]. MgB2 superconductor exhibits many impressive properties such as highest critical temperature amongst intermetallic superconductors which means low cooling costs, impressive grain boundary transparency to the flow of curre...

The newly discovered 39-K superconductor MgB2 holds great promise for superconducting electronics. Like the conventional superconductor Nb, MgB2 is a phonon-mediated superconductor, with a relatively long coherence length. These properties make the prospect of fabricating reproducible uniform Josephson junctions, the fundamental element of superconducting circuits, much more favourable for MgB2...

The rapid progress in developing MgB2 superconductors since its relatively recent discovery has made this material a strong competitor to other lowand high-temperature superconductor (HTS) materials for technological applications, especially in niche markets such as magnetic resonance imaging (MRI). Thanks to the lack of weak links and the two-gap superconductivity of MgB2, [2,3] a number of di...

We report the successful manufacture and characterization of a microwave resonant cylindrical cavity made of bulk MgB2 superconductor (Tc ≈ 38.5 K), which has been produced by the Reactive Liquid Mg Infiltration technique. The quality factor of the cavity for the TE011 mode, resonating at 9.79 GHz, has been measured as a function of the temperature. At T = 4.2 K, the unloaded quality factor is ...

130 LLE Review, Volume 91 The recent discovery of superconductivity at 39 K in hexagonal magnesium diborides1 has stimulated very intensive investigations of the fundamental mechanism of superconductivity in MgB2 as well as the possible practical applications of this new superconductor. In comparison with high-temperature cuprates, MgB2 superconductors have more than two-timeslower anisotropy, ...

The MgB2 bulks were prepared by high energy milling of Mg and B powder. The correlations among milling times, microstructure and superconducting properties were investigated in MgB2 bulks. Samples were characterized by x-ray diffraction (XRD), energy dispersive spectrometry (EDX) and scanning electron microscope (SEM), and the magnetization properties were examined by a Superconducting quantum ...