Effect of sintering time on superconductivity in MgB2

Authors

Yun Zhang, University of WollongongFollow
Sihai Zhou, University of WollongongFollow
Cheng Lu, University of WollongongFollow
K C. Chung, korea Institute of Materials Science, South Korea
S. X. Dou, University of WollongongFollow

RIS ID

31485

Publication Details

Zhang, Y., Zhou, S. H., Lu, C., Chung, K. C. Dou, S. X. (2009). Effect of sintering time on superconductivity in MgB₂. International Journal of Modern Physics B, 23 (17), 3476-3481.

Abstract

We studied the effect of sintering time on microstrain, critical current density (J_c), and resistivity (ρ) in MgB₂ bulks. All samples were fabricated by solid state reaction and sintered within a time range of 30 minutes – 60 hours. It has been found that microstrain increases as the sintering time increases, while the connectivity decreases with sintering time from 30 minutes to 20 hours, and then increases to 60 hours. Both the irreversibility field, H_irr, and the upper critical field, H_c2, were increased with microstrain. This indicates that the disorder significantly affects H_irr and H_c2. The sample with the sintering time of 30 minutes exhibited the highest J_c at all fields, due to its having the highest connectivity. When the sample is sintered for a very long time (60 hours), J_c at high fields can be improved. This is mainly attributed to increased H_c2.

Grant Number

ARC/DP0770205

Additional Grant Number

http://purl.org/au-research/grants/ARC/DP0770205