Pinning behavior in bulk MgB2 prepared using boron powder refined via high-energy ultra-sonication

Sai Srikanth Arvapalli; Muralidhar Miryala; Milos Jirsa; Naomichi Sakai; Masato Murakami

doi:10.1007/s10948-021-05885-z

Pinning behavior in bulk MgB₂ prepared using boron powder refined via high-energy ultra-sonication

Sai Srikanth Arvapalli, Muralidhar Miryala, Milos Jirsa, Naomichi Sakai, Masato Murakami

Research output: Contribution to journal › Article › peer-review

5 Citations (Scopus)

Abstract

We successfully refined a cheap commercial boron powder by means of high-energy ultra-sonication and utilized it in synthesis of bulk MgB₂. Rietveld phase analysis of X-ray diffraction pattern revealed completely formed MgB₂ with a low amount of MgO. MgB₂ bulk prepared of boron ultra-sonicated in ethanol for 15 min showed self-field J_c of around 300 kA/cm² at 20 K without any compromise in T_c (~39 K). Pinning analysis based on Dew-Hughes expression showed major pinning contribution from grain-boundary pinning (~95.5%), along with a slight contribution from point pinning (4.5%). The microstructure study detected a system of large MgB₂ grains (hundreds nm large) and 10–20 nm sized particles, possibly Mg-B-O, formed at MgB₂ grain boundaries.

Original language	English
Pages (from-to)	1297-1301
Number of pages	5
Journal	Journal of Superconductivity and Novel Magnetism
Volume	34
Issue number	5
DOIs	https://doi.org/10.1007/s10948-021-05885-z
Publication status	Published - 2021 May

Keywords

Boron refinement
Bulk MgB
Flux pinning
Ultrasonication

ASJC Scopus subject areas

Electronic, Optical and Magnetic Materials
Condensed Matter Physics

Access to Document

10.1007/s10948-021-05885-z

Cite this

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title = "Pinning behavior in bulk MgB2 prepared using boron powder refined via high-energy ultra-sonication",

abstract = "We successfully refined a cheap commercial boron powder by means of high-energy ultra-sonication and utilized it in synthesis of bulk MgB2. Rietveld phase analysis of X-ray diffraction pattern revealed completely formed MgB2 with a low amount of MgO. MgB2 bulk prepared of boron ultra-sonicated in ethanol for 15 min showed self-field Jc of around 300 kA/cm2 at 20 K without any compromise in Tc (~39 K). Pinning analysis based on Dew-Hughes expression showed major pinning contribution from grain-boundary pinning (~95.5%), along with a slight contribution from point pinning (4.5%). The microstructure study detected a system of large MgB2 grains (hundreds nm large) and 10–20 nm sized particles, possibly Mg-B-O, formed at MgB2 grain boundaries.",

keywords = "Boron refinement, Bulk MgB, Flux pinning, Ultrasonication",

author = "Arvapalli, {Sai Srikanth} and Muralidhar Miryala and Milos Jirsa and Naomichi Sakai and Masato Murakami",

note = "Funding Information: This work was partly supported by the Shibaura Institute of Technology (SIT) Research Center for Green Innovation and Grant-in-Aid FD research budget code: 112282. One of the authors (SSA) received support from SIT for his doctoral program. Milos Jirsa received support from the program Strategy AV 21-VP3 “Energy storage in flywheels.” Publisher Copyright: {\textcopyright} 2021, The Author(s).",

year = "2021",

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doi = "10.1007/s10948-021-05885-z",

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AU - Arvapalli, Sai Srikanth

AU - Miryala, Muralidhar

AU - Jirsa, Milos

AU - Sakai, Naomichi

AU - Murakami, Masato

N1 - Funding Information: This work was partly supported by the Shibaura Institute of Technology (SIT) Research Center for Green Innovation and Grant-in-Aid FD research budget code: 112282. One of the authors (SSA) received support from SIT for his doctoral program. Milos Jirsa received support from the program Strategy AV 21-VP3 “Energy storage in flywheels.” Publisher Copyright: © 2021, The Author(s).

PY - 2021/5

Y1 - 2021/5

N2 - We successfully refined a cheap commercial boron powder by means of high-energy ultra-sonication and utilized it in synthesis of bulk MgB2. Rietveld phase analysis of X-ray diffraction pattern revealed completely formed MgB2 with a low amount of MgO. MgB2 bulk prepared of boron ultra-sonicated in ethanol for 15 min showed self-field Jc of around 300 kA/cm2 at 20 K without any compromise in Tc (~39 K). Pinning analysis based on Dew-Hughes expression showed major pinning contribution from grain-boundary pinning (~95.5%), along with a slight contribution from point pinning (4.5%). The microstructure study detected a system of large MgB2 grains (hundreds nm large) and 10–20 nm sized particles, possibly Mg-B-O, formed at MgB2 grain boundaries.

AB - We successfully refined a cheap commercial boron powder by means of high-energy ultra-sonication and utilized it in synthesis of bulk MgB2. Rietveld phase analysis of X-ray diffraction pattern revealed completely formed MgB2 with a low amount of MgO. MgB2 bulk prepared of boron ultra-sonicated in ethanol for 15 min showed self-field Jc of around 300 kA/cm2 at 20 K without any compromise in Tc (~39 K). Pinning analysis based on Dew-Hughes expression showed major pinning contribution from grain-boundary pinning (~95.5%), along with a slight contribution from point pinning (4.5%). The microstructure study detected a system of large MgB2 grains (hundreds nm large) and 10–20 nm sized particles, possibly Mg-B-O, formed at MgB2 grain boundaries.

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KW - Ultrasonication

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