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Superconducting composites of MgB2 with Additions obtained by Spark Plasma Sintering

Published online by Cambridge University Press:  11 July 2012

P. Badica ,
G. Aldica  and
M. Burdusel
P. Badica
Affiliation:
National Institute of Materials Physics, str. Atomistilor 105 bis, Magurele, 077125, Romania
G. Aldica
Affiliation:
National Institute of Materials Physics, str. Atomistilor 105 bis, Magurele, 077125, Romania
M. Burdusel
Affiliation:
National Institute of Materials Physics, str. Atomistilor 105 bis, Magurele, 077125, Romania
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Abstract

Sb2O3, Sb-metal, Bi2O3 or Bi-metal, powders were mixed with MgB2 powder. Starting compositions were ((MgB2)(M2O3)x, x = 0.0025, 0.005, 0.015, and (MgB2)(M)y, y = 0.01, M = Sb, Bi. Mixtures were processed by Spark Plasma Sintering (SPS) technique. As obtained composite samples show high density, above 94% of the theoretical density. While the secondary phases indicate on similar reactions, samples show different behavior vs. addition type and amount. This does not directly correlate with the melting temperature of the addition. From the critical current density (Jc) and irreversibility field (Hirr) enhancement viewpoints, optimum additions are oxides for x=0.025, 0.005. Both oxides are improving Jc at high fields, but Sb2O3 is effective up to 10 K, while Bi2O3 is up to 30 K. Metal additions are decreasing Jc and Hirr when compared to pristine MgB2sample.

Keywords

superconductingcompositesintering
Type
Articles
Information
MRS Online Proceedings Library (OPL) , Volume 1454: Symposium HH – Nanocomposites, Nanostructures and Heterostructures of Correlated Oxide Systems , 2012 , pp. 115 - 121
Copyright
Copyright © Materials Research Society 2012

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