Structural-microstructural characteristics and its correlations with the superconducting properties of in situ PIT-processed MgB2 tapes with ethyltoluene and SiC powder added

Anjana Asthana, A. Matsumoto, H. Kitaguchi, Y. Matsui, T. Hara, K. Watanabe, H. Yamada, N. Uchiyama, H. Kumakura

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12 Citations (Scopus)

Abstract

We performed structural-microstructural investigations of pure MgB 2, ethyltoluene and both ethyltoluene-and SiC-added MgB 2/Fe tapes. The analysis of the microstructure shows that the grain size for the pure and ethyltoluene-added MgB2 tape sample is in the range of 10-100nm. However, with the addition of both ethyltoluene and SiC, the grain size decreases to about 5-80nm. The a-axis length of the ethyltoluene-added tape samples is slightly decreased, whereas for both ethyltoluene-and SiC-added samples, the a-axis length is decreased by 0.4% as compared to the pure MgB2 tape sample, showing the amount of carbon substitution is less in ethyltoluene-added tape samples. The reason for the higher Jc values of the ethyltoluene-added MgB2 tape sample as compared to the pure MgB2 tapes is the presence of a lesser amount of the impurity phase, MgO. The large improvement in Jc-B properties for the ethyltoluene-and SiC-added MgB2 tape sample is attributed to (1)the enhancement of upper critical field, Bc2, by the substitution of carbon for boron, (2)pinning by nanosized (5-20nm) particles of Mg2Si and other silicides, (3)enhanced grain boundary pinning due to the smaller grain size and (4)the presence of a lesser amount of impurity phase, MgO, as compared to the pure sample.

Original languageEnglish
Article number115013
JournalSuperconductor Science and Technology
Volume21
Issue number11
DOIs
Publication statusPublished - 2008 Nov 1

ASJC Scopus subject areas

  • Ceramics and Composites
  • Condensed Matter Physics
  • Metals and Alloys
  • Electrical and Electronic Engineering
  • Materials Chemistry

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