Effect of Carbon Substitution on the Superconducting Properties of Nanocarbon-, Nanodiamond- and Nano-SiC-Doped MgB^sub 2

A comparative study on the effect of doping of nanocarbon (C), nanodiamond, and the well-established nano-SiC in MgB... is carried out under identical doping levels (C: 2.6 and 5.2 wt%) and processing conditions (800...C, 2 h). The bulk samples are prepared via powder-in-sealed-tube method. The XRD...

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Bibliographic Details
Published in:Journal of the American Ceramic Society 2011-04, Vol.94 (4), p.1133
Main Authors: Varghese, Neson, Vinod, Krishnankutty, Rahul, Sugathan, Anees, Pazhedath, Devadas, Kavazhikathu Mohandas, Thomas, Syju, Shipra, Sundaresan, Athinarayanan, Roy, Sindhunil Barman, Syamaprasad, Upendran
Format: Article
Language:English
Subjects:
Ceramics
Comparative studies
Materials science
Semiconductor doping
Superconductivity
Online Access:Get full text
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Summary:A comparative study on the effect of doping of nanocarbon (C), nanodiamond, and the well-established nano-SiC in MgB... is carried out under identical doping levels (C: 2.6 and 5.2 wt%) and processing conditions (800...C, 2 h). The bulk samples are prepared via powder-in-sealed-tube method. The XRD analysis shows no reacted or unreacted phases in the case of lightly nano-C-doped sample while all other doped samples show unreacted or/and reacted phases. The a-axis shrinkage is observed for all doped samples, among which nano-C-doped samples show maximum shrinkage, an evidence for C substitution at B sites. The C substitution is also confirmed by the analysis of full-width at half-maximum values for (100), (101), (002), and (110) peaks which are broadened. The C substitution together with the presence of nonsuperconducting phases decreases the ... to a small extent. The ... is significantly enhanced for all doped samples compared with the pure sample among which ... (nano-C) exhibits the best performance in ... enhancement up to a field of 8 T. (ProQuest: ... denotes formulae/symbols omitted.)
ISSN:0002-7820
1551-2916