Enhancement in critical current density and irreversibility field of bulk MgB2 by C and CaCO3 co-addition

Tan, Kean Sheng and Chen, Soo Kien and Jun, B. H. and Kim, C. J. (2008) Enhancement in critical current density and irreversibility field of bulk MgB2 by C and CaCO3 co-addition. Superconductor Science and Technology, 21 (10). ISSN 0953-2048

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Official URL: http://dx.doi.org/10.1088/0953-2048/21/10/105013

Abstract

Paper ash, a source of C and CaCO3, was used for the first time as a cheap form of sub-micron particles for doping. 0–10 wt% of the ash was added to Mg + 2B and in situ reacted at 850 ◦C for 30 min in flowing Ar atmosphere. The CaCO3 decomposed and reacted with B to form CaB6 as an impurity phase. Also, the Tc and the a-axis lattice parameter decreased with increasing ash content, which suggests that C substitution at boron sites occurred. Enhancement of high-field Jc(H), Hirr(T ) and Hc2(T ) was observed with an optimum level of about 5 wt% ash addition

Item Type:Article
Keyword:Paper ash, C and CaCO3, superconductor
Faculty or Institute:Faculty of Science
Publisher:Institute of Physics
DOI Number:10.1088/0953-2048/21/10/105013
ID Code:6647
Deposited By: Najwani Amir Sariffudin
Deposited On:20 May 2010 01:40
Last Modified:28 Jul 2010 04:08

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