Properties of superconducting MgB_2 wires: "in-situ" versus "ex-situ" reaction technique

Simple item page
dc.creatorPan, Alexey V
dc.creatorZhou, Sihai
dc.creatorLiu, Huakun
dc.creatorDou, Shixue
dc.date2003-02-13
dc.date.accessioned2026-07-07T02:49:39Z
dc.date.available2026-07-07T02:49:39Z
dc.descriptionWe have fabricated a series of iron-sheathed superconducting wires prepared by the powder-in-tube technique from (MgB_2)_{1-x}:(Mg+2B)_x initial powder mixtures taken with different proportions, so that x varies from 0 to 1. It turned out that "ex-situ" prepared wire (x = 0) has considerable disadvantages compared to all the other wires in which "in-situ" assisted (0 < x < 1) or pure "in-situ" (x = 1) preparation was used due to weaker inter-grain connectivity. As a result, higher critical current densities J_c were measured over the entire range of applied magnetic fields B_a for all the samples with x > 0. Pinning of vortices in MgB_2 wires is shown to be due to grain boundaries. J_c(B_a) behavior is governed by an interplay between the transparency of grain boundaries and the amount of "pinning" grain boundaries. Differences between thermo-magnetic flux-jump instabilities in the samples and a possible threat to practical applications are also discussed.
dc.descriptionTo be published in Supercond. Sci. Technol. (2003), in press
dc.identifierhttps://arxiv.org/abs/cond-mat/0302249
dc.identifierhttp://arxiv.org/abs/cond-mat/0302249
dc.identifierSupercond. Sci. Technol. 16, 639-644 (2003)
dc.identifierdoi:10.1088/0953-2048/16/5/317
dc.identifier.urihttp://salesiana.dossiersoluciones.com/handle/123456789/20881
dc.subjectSuperconductivity
dc.titleProperties of superconducting MgB_2 wires: "in-situ" versus "ex-situ" reaction technique
dc.typetext

Files

Collections

arXiv