Effect of Adding on the Critical Current Density and Lateral Levitation Force of Bulk
JOURNAL OF LOW TEMPERATURE PHYSICS, cilt.181, ss.38-48, 2015 (SCI-Expanded, Scopus)
- Yayın Türü: Makale / Tam Makale
- Cilt numarası: 181
- Basım Tarihi: 2015
- Doi Numarası: 10.1007/s10909-015-1325-7
- Dergi Adı: JOURNAL OF LOW TEMPERATURE PHYSICS
- Derginin Tarandığı İndeksler: Science Citation Index Expanded (SCI-EXPANDED), Scopus
- Sayfa Sayıları: ss.38-48
- Anahtar Kelimeler: MgB2 superconductor, Malic acid adding, Critical current density, Lateral levitation force, MGB2 BULKS, SUPERCONDUCTOR, OPTIMIZATION, BEHAVIOR, FIELD, TI
- Karadeniz Teknik Üniversitesi Adresli: Evet
Özet
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.