TY - JOUR
T1 - Superconducting properties of sintered bulk MgB2 prepared from hexane-mediated high-energy-ultra-sonicated boron
AU - Arvapalli, S. S.
AU - Miryala, M.
AU - Sunsanee, P.
AU - Jirsa, M.
AU - Murakami, Masato
N1 - Funding Information:
This work was partly supported by Shibaura Institute of Technology (SIT) Research Center for Green Innovation and Grant-in-Aid FD research budget code: 112282. One of the authors (Sai Srikanth Arvapalli) acknowledges support from SIT for his doctoral program.
Publisher Copyright:
© 2020
PY - 2021/3
Y1 - 2021/3
N2 - Recently, novel low cost techniques have been employed to improve critical current density of MgB2. Ultra-sonication is one such technique. We report on the influence of hexane dispersant on particle size of ultra-sonicated cheap commercial boron and the superconducting properties of MgB2 bulks prepared using this new precursor. XRD showed major peaks corresponding to MgB2, with small fractions of MgO and unreacted Mg. Tc was close to 39 K, with a sharp transition. The highest Jc was found in the sample with boron ultra-sonicated for 30 min as high as 375, 328, and 270 kA/cm2 at 10, 15, and 20 K, respectively. SEM analysis revealed tiny particles and layers randomly dispersed in the microstructure, while EDX indicated that these particles were secondary phases of Mg, B, and O. Flux pinning diagrams showed the peak of normalized pinning force located close to b = 0.2, depicting dominance of grain boundary pinning mechanism.
AB - Recently, novel low cost techniques have been employed to improve critical current density of MgB2. Ultra-sonication is one such technique. We report on the influence of hexane dispersant on particle size of ultra-sonicated cheap commercial boron and the superconducting properties of MgB2 bulks prepared using this new precursor. XRD showed major peaks corresponding to MgB2, with small fractions of MgO and unreacted Mg. Tc was close to 39 K, with a sharp transition. The highest Jc was found in the sample with boron ultra-sonicated for 30 min as high as 375, 328, and 270 kA/cm2 at 10, 15, and 20 K, respectively. SEM analysis revealed tiny particles and layers randomly dispersed in the microstructure, while EDX indicated that these particles were secondary phases of Mg, B, and O. Flux pinning diagrams showed the peak of normalized pinning force located close to b = 0.2, depicting dominance of grain boundary pinning mechanism.
KW - Bulk MgB
KW - Cheap commercial boron
KW - Hexane dispersant
KW - High-energy ultra-sonication
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U2 - 10.1016/j.mseb.2020.115030
DO - 10.1016/j.mseb.2020.115030
M3 - Article
AN - SCOPUS:85098848515
SN - 0921-5107
VL - 265
JO - Materials Science and Engineering B: Solid-State Materials for Advanced Technology
JF - Materials Science and Engineering B: Solid-State Materials for Advanced Technology
M1 - 115030
ER -