Effect of Adding on the Critical Current Density and Lateral Levitation Force of Bulk

SAVAŞKAN B., Koparan E. T., GUNER S. B., Celik S., ÖZTÜRK K., YANMAZ E.

JOURNAL OF LOW TEMPERATURE PHYSICS, vol.181, pp.38-48, 2015 (SCI-Expanded) identifier identifier

  • Publication Type: Article / Article
  • Volume: 181
  • Publication Date: 2015
  • Doi Number: 10.1007/s10909-015-1325-7
  • Journal Name: JOURNAL OF LOW TEMPERATURE PHYSICS
  • Journal Indexes: Science Citation Index Expanded (SCI-EXPANDED), Scopus
  • Page Numbers: pp.38-48
  • Keywords: MgB2 superconductor, Malic acid adding, Critical current density, Lateral levitation force, MGB2 BULKS, SUPERCONDUCTOR, OPTIMIZATION, BEHAVIOR, FIELD, TI
  • Karadeniz Technical University Affiliated: No

Abstract

We fabricated malic acid -added bulks by wet mixing and "Two-step solid state reaction method". The effects of adding malic acid on , behaviour and lateral levitation force features of bulk have been investigated. A systematic decrease in the critical temperature with increasing adding level confirms the substitution of C at the B site of . While the 4 wt% sample showed the best of at 4 T and 5 K, 15 wt% sample showed uncompetitive lower critical current density , which ascribes the poor connectivity due to the excessive unsubstituted C distribution at grain boundaries and the presence of high MgO amount. At 24 and 28 K, the 4 and 6 wt% malic-acid-added samples exhibit a higher lateral force than pure sample. Based on the observed values of M-H, (H) and lateral levitation force , it can be concluded that the 4 wt% malic-acid-added sample is the best of the studied samples.