High-Performance Bulk MgB2 Superconductor Using Amorphous Nano-boron

SS Arvapalli, M Muralidhar, M Murakami - Journal of Superconductivity …, 2019 - Springer
MgB 2 bulks were produced by in situ solid-state reaction in Ar gas using high-purity
commercial powders of Mg metal and amorphous nano-B mixed in a fixed ratio of Mg: B= 1 …

Effects of Nano-Sized BN Doping on the Phase Formation, Tc and Critical Current Density of MgB2 Superconductor

S Soltanian, M Delfany, XL Wang, MJ Qin… - Journal of Metastable …, 2005 - Trans Tech Publ
MgB2 polycrystalline bulk samples with additions of 0, 5, 10 and 20% wt.% nano-sized BN
powders were prepared using the reaction in-situ method. All the samples were sintered at …

High critical current densities in bulk MgB2 fabricated using amorphous boron

M Muralidhar, N Kenta, MR Koblischka… - … status solidi (a), 2015 - Wiley Online Library
We prepared bulk MgB2 from high‐purity commercial powders of Mg metal (99.9% purity)
and amorphous B (99% purity) powders using a single‐step solid state reaction at 775° C for …

Synthesis and characterization of MgB2 superconductor

DK Aswal, S Sen, A Singh, TVC Rao, JC Vyas… - Physica C …, 2001 - Elsevier
Starting with Mg in two different forms, namely, powder and flakes, and B as powder, MgB2
superconductor has been synthesized using solid-state sintering method under atmospheric …

Progress in Critical Current Density (Jc) in Sintered MgB2 Bulks

M Muralidhar, M Murakami - Journal of superconductivity and novel …, 2018 - Springer
The present paper focuses on methods of further improving the flux pinning and critical
current density of disk-shaped MgB 2 bulk superconductors by adding excess Mg metal in …

Improved critical current densities of bulk MgB2 using carbon-coated amorphous boron

M Muralidhar, M Higuchi, M Jirsa, P Diko… - IEEE Transactions …, 2016 - ieeexplore.ieee.org
In this study, we report on a further improvement of the critical current density of the sintered
bulk MgB 2 material utilizing the optimized sintering temperature combined with a varying …

Optimization of sintering conditions in bulk MgB2 material for improvement of critical current density

M Muralidhar, K Nozaki, H Kobayashi, XL Zeng… - Journal of Alloys and …, 2015 - Elsevier
The present investigation focuses on methods to further improve the J c values of disk-
shaped bulk MgB 2 superconductors by optimizing the sintering conditions. We prepared …

Significant improvement of Jc in MgB2 bulk superconductor using ball-milled high-purity crystalline boron

Y Zhang, X Xu, Y Zhao, JH Kim, C Lu… - Superconductor …, 2008 - iopscience.iop.org
The particle size, purity and form of the starting boron powders play an important role in the
superconducting properties of MgB 2. In this paper high-purity (99.999%) boron powders …

Improved superconducting properties in nanocrystalline bulk

A Gümbel, J Eckert, G Fuchs, K Nenkov… - Applied physics …, 2002 - pubs.aip.org
High density nanocrystalline MgB 2 bulk superconductors with distinctly improved pinning
were prepared by mechanical alloying of Mg and B powders at ambient temperatures …

Superconducting properties of MgB2 prepared from attrition ball-milled boron powder

JH Lee, SY Shin, CJ Kim, HW Park - Journal of Alloys and Compounds, 2009 - Elsevier
We report superconducting properties of the MgB2 pellets prepared from the attrition ball-
milled boron, in order to control the grain size of the MgB2 that is formed from it. We …