Mechanism of Enhanced Carbon Substitution in CNT-MgB{sub 2} Superconductor Composite Using Ball Milling in a Methanol Medium: Positive Role of Boron Oxide
- King Abdulaziz City for Science and Technology (KACST), National Center for Nanotechnology (Saudi Arabia)
- King Saud University (KSU), Department of Physics and Astronomy, College of Science (Saudi Arabia)
- Prince Sattam bin Abdulaziz University, Department of Physics, College of Science and Humanity Studies (Saudi Arabia)
- King Saud University, King Abdullah Institute for Nanotechnology (KAIN) (Saudi Arabia)
- University of Wollongong, Institute for Superconducting and Electronic Materials, Australian Institute for Innovative Materials (Australia)
In the present work, we report on the role of the methanol medium and ball-milling time in the substitution of carbon in carbon nanotube CNT-MgB{sub 2} superconductors. In our samples, we find that the CNTs are intact and well dispersed. However, the liquid medium (methanol) used for dispersion of the constituent materials is also acting as a source of C for substitution. However, the substitution of C from methanol is not direct; rather, B{sub 2}O{sub 3}, which had been considered as just an impurity, plays a positive role in binding the methanol molecules to the surface of B. The detailed mechanism of methanol absorption and the role of B{sub 2}O{sub 3} and ball-milling time are presented here. In addition, we present the J{sub C}(H, T) data, which show that approximately 3% of C substitution provides the best critical current density at 20 K.
- OSTI ID:
- 22776973
- Journal Information:
- Journal of Superconductivity and Novel Magnetism, Vol. 31, Issue 4; Other Information: Copyright (c) 2018 Springer Science+Business Media, LLC, part of Springer Nature; Article Copyright (c) 2017 Springer Science+Business Media, LLC; http://www.springer-ny.com; Country of input: International Atomic Energy Agency (IAEA); ISSN 1557-1939
- Country of Publication:
- United States
- Language:
- English
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