Degradation of superconducting properties in MgB2 by formation of the MgB4 phase
Küçük Resim Yok
Tarih
2002
Yazarlar
Dergi Başlığı
Dergi ISSN
Cilt Başlığı
Yayıncı
Springer/Plenum Publishers
Erişim Hakkı
info:eu-repo/semantics/closedAccess
Özet
Superconducting MgB2 polycrystalline samples have been fabricated under two different conditions in order to determine the effect of MgB4 phase. A series of samples was placed in an alpha-alumina container closed with a cup and fired under high purity argon gas. The other series of samples was placed in an a-alumina boot without any lid and fired under similar conditions. For the first series of samples, we have found pure MgB2 phase formation and a narrow transition width at 0.4 K. For the second series of samples, significant amount of MgB4 phase were formed and the T-zero was decreased to 27 K. For both the group of samples magnetization hysteresis loops obtained at various temperature range and applied field up to 2 T. The best J(cmag) for the first series of samples was 1.9 x 10(5) x A/cm(2) at 10 K and 0 T, and for the second series of samples was 0.7 x 10(4) x A/cm(2) at 10 K and 0 T.
Açıklama
Anahtar Kelimeler
MgB2, MgB4 phase
Kaynak
Journal of Superconductivity
WoS Q Değeri
Q3
Scopus Q Değeri
N/A
Cilt
15
Sayı
6
