1. Characterization of Electrospun Bi2Sr2CaCu2O8+δ Nanowires With Reduced Preparation Temperature
- Author
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XianLin Zeng, Crosby Chang, Oliver Eibl, Uwe Hartmann, Praveen Kumar, Thomas Karwoth, Fabian Laurent, Michael Rudolf Koblischka, and Anjela Koblischka-Veneva
- Subjects
Superconductivity ,Materials science ,Doping ,Nanowire ,02 engineering and technology ,Thermal treatment ,021001 nanoscience & nanotechnology ,Condensed Matter Physics ,Microstructure ,01 natural sciences ,Electrospinning ,Electronic, Optical and Magnetic Materials ,Chemical engineering ,Phase (matter) ,0103 physical sciences ,Crystallite ,Electrical and Electronic Engineering ,010306 general physics ,0210 nano-technology - Abstract
Bi2Sr2CaCu2O8+δ (Bi-2212) nanowires were fabricated employing electrospinning. A subsequent thermal treatment based on thermal gravity analysis is required to obtain the final crystal structure and superconductivity; however, if this preparation temperature is too high, the nanowire structure may completely collapse during the treatment, which is even more pronounced when aligning the nanowires. Therefore, Li acetate was added in various amounts to the starting composition, which enabled to produce the desired Bi-2212 phase already at about 750 °C instead of 840 °C. An X-ray and a TEM analysis proved that the resulting nanowires were single-phase Bi-2212. After the electro-spinning process, the resulting samples form fabric-like networks, and in the heat treatment, the nanowire structure was found to survive. The nanowires exhibited a polycrystalline structure with grain sizes of 20–50 nm, an average wire diameter of ∼100 nm, and a length of up to several micrometers. The resulting nanowire network samples were characterized by magnetic measurements and electric transport measurements in fields up to 9 and 4 T, respecitively.
- Published
- 2018
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