Mechanism of Enhanced Carbon Substitution in CNT-MgB2 Superconductor Composite Using Ball Milling in a Methanol Medium: Positive Role of Boron Oxide
RIS ID
115985
Abstract
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 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 2 O 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 2 O 3 and ball-milling time are presented here. In addition, we present the J C (H, T) data, which show that approximately 3% of C substitution provides the best critical current density at 20 K.
Publication Details
Alghamdi, F. Saad., Shahabuddin, M., Alzayed, N. S., Madhar, N. Ahamad., Parakkandy, J. M., Khan, M. Majeed., Khan, A. & Hossain, M. Al. (2018). Mechanism of Enhanced Carbon Substitution in CNT-MgB2 Superconductor Composite Using Ball Milling in a Methanol Medium: Positive Role of Boron Oxide. Journal of Superconductivity and Novel Magnetism, 31 1119-1126.