Effect of Er doping on the superconducting properties of porous MgB2
Küçük Resim Yok
Tarih
2015
Dergi Başlığı
Dergi ISSN
Cilt Başlığı
Yayıncı
Indian Academy of Sciences
Erişim Hakkı
info:eu-repo/semantics/closedAccess
Özet
MgB2 bulk sample with porous structure was produced by using the in-situ solid-state reaction method under argon (Ar) atmosphere of 10 bar. Elemental Er in powder form was doped into MgB2 with different compositions (Mg1-xErx)B2, where x = 0.00, 0.03 and 0.05, in order to investigate the effect of rare-earth (RE) element Er on the structural and electromagnetic properties of porous MgB2. The Er-doped samples result in small grain size structure compared to the undoped one. The lattice constants a and c of the doped samples, determined from X-ray diffraction (XRD) analysis, increase with the increasing Er content, and consequently the superconducting transition temperature (Tonsetc) of MgB2, determined from resistivity measurements, is slightly suppressed. Also, the upper critical field (Bc2), the irreversibility field (Birr) and the critical current density (Jc) values are significantly enhanced in the doped samples. For the best sample (x = 0.03), at 15 K under a magnetic field of 4 T, the Jc value reaches 2.4×104 A cm-2, which is higher than that of the porous sample by an order of 103, and the Birr value at 20 K reaches 9.7 T. These results imply that the RE element Er fills the pores, enhances the density and the grain connectivity. Hence, the superconducting properties of the porous MgB2 sample improve by Er doping.
Açıklama
Anahtar Kelimeler
(Mg1-xErx)B2, Critical current density, Irreversibility field, Superconductivity, Upper critical field, Critical current density (superconductivity), Erbium compounds, Lattice constants, Magnesium, Solid state reactions, Superconducting transition temperature, Superconductivity, (Mg<sub>1-x</sub>Er<sub>x</sub>)B<sub>2</sub>, Electromagnetic properties, Grain connectivity, Irreversibility fields, Resistivity measurement, Solid state reaction method, Superconducting properties, Upper critical fields, Erbium, (Mg1-xErx)B2, Critical current density, Irreversibility field, Superconductivity, Upper critical field, Critical current density (superconductivity), Erbium compounds, Lattice constants, Magnesium, Solid state reactions, Superconducting transition temperature, Superconductivity, (Mg<sub>1-x</sub>Er<sub>x</sub>)B<sub>2</sub>, Electromagnetic properties, Grain connectivity, Irreversibility fields, Resistivity measurement, Solid state reaction method, Superconducting properties, Upper critical fields, Erbium
Kaynak
Bulletin of Materials Science
WoS Q Değeri
Q4
Scopus Q Değeri
Q3
Cilt
38
Sayı
1
