Nano-sized amorphous/semi-crystalline boron ratio and external Mg effects on transport and structural properties in MgB2 IMD wires
Yükleniyor...
Dosyalar
Tarih
2021
Dergi Başlığı
Dergi ISSN
Cilt Başlığı
Yayıncı
Elsevier B.V.
Erişim Hakkı
info:eu-repo/semantics/closedAccess
Özet
In the present study, Mg diffusion process has been investigated by transport measurements and surface morphology analysis in round MgB2 wires made with internal Mg diffusion (IMD) method. These wires were produced using semi-amorphous boron, nano-sized amorphous boron or mixtures of them via cold drawing process. In addition to the conventional IMD wire production technique, a thin layer of magnesium was initially coated on the interior of the iron sheath and diffused into the boron powder during sintering. It has been found that Mg coating is effective on improving the engineering current density of IMD wires having relatively thick MgB2 cores. Surprisingly, Mg coating is also effective in non-stoichiometric hybrid IMD wires containing highly excessive amount of Mg.
Açıklama
Anahtar Kelimeler
Boron, Crystallinity, IMD, MgB2 Wire, Porosity
Kaynak
Physica C: Superconductivity and its Applications
WoS Q Değeri
Q4
Scopus Q Değeri
Q2
Cilt
581
