High-Performance Bulk MgB2 Superconductor Using Amorphous Nano-boron

Sai Srikanth Arvapalli, Muralidhar Miryala, Masato Murakami

Research output: Contribution to journalArticle

1 Citation (Scopus)

Abstract

MgB2 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 = 1:2. Single-phase materials have been obtained and grain structure and its implications are reported. All samples were sintered at 775 °C for 3 h in Ar atmosphere. X-ray diffraction results show that high-purity MgB2 phase has been fabricated, which as well is reflected in critical temperature (Tc = 37.8 K). Magnetic measurements reveal a high critical current density (Jc) value such as 408 kA/cm2 when nano-amorphous boron is used. SEM studies show that nano-ordered MgB2 grains are formed, thereby creating large number of grain boundaries responsible for high critical current densities. Analysis of normalized pinning force curve as a function of reduced magnetic field indicates that dominant pinning is caused by grain boundaries.

Original languageEnglish
JournalJournal of Superconductivity and Novel Magnetism
DOIs
Publication statusAccepted/In press - 2018 Jan 1

Fingerprint

Boron
Superconducting materials
critical current
purity
Grain boundaries
boron
grain boundaries
current density
Crystal microstructure
Magnetic variables measurement
Solid state reactions
Powders
magnetic measurement
critical temperature
Gases
Metals
Magnetic fields
solid state
atmospheres
X ray diffraction

Keywords

  • Bulk MgB
  • High critical current density
  • Microstructural analysis
  • Nano-amorphous boron

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics

Cite this

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title = "High-Performance Bulk MgB2 Superconductor Using Amorphous Nano-boron",
abstract = "MgB2 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 = 1:2. Single-phase materials have been obtained and grain structure and its implications are reported. All samples were sintered at 775 °C for 3 h in Ar atmosphere. X-ray diffraction results show that high-purity MgB2 phase has been fabricated, which as well is reflected in critical temperature (Tc = 37.8 K). Magnetic measurements reveal a high critical current density (Jc) value such as 408 kA/cm2 when nano-amorphous boron is used. SEM studies show that nano-ordered MgB2 grains are formed, thereby creating large number of grain boundaries responsible for high critical current densities. Analysis of normalized pinning force curve as a function of reduced magnetic field indicates that dominant pinning is caused by grain boundaries.",
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AU - Arvapalli, Sai Srikanth

AU - Miryala, Muralidhar

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N2 - MgB2 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 = 1:2. Single-phase materials have been obtained and grain structure and its implications are reported. All samples were sintered at 775 °C for 3 h in Ar atmosphere. X-ray diffraction results show that high-purity MgB2 phase has been fabricated, which as well is reflected in critical temperature (Tc = 37.8 K). Magnetic measurements reveal a high critical current density (Jc) value such as 408 kA/cm2 when nano-amorphous boron is used. SEM studies show that nano-ordered MgB2 grains are formed, thereby creating large number of grain boundaries responsible for high critical current densities. Analysis of normalized pinning force curve as a function of reduced magnetic field indicates that dominant pinning is caused by grain boundaries.

AB - MgB2 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 = 1:2. Single-phase materials have been obtained and grain structure and its implications are reported. All samples were sintered at 775 °C for 3 h in Ar atmosphere. X-ray diffraction results show that high-purity MgB2 phase has been fabricated, which as well is reflected in critical temperature (Tc = 37.8 K). Magnetic measurements reveal a high critical current density (Jc) value such as 408 kA/cm2 when nano-amorphous boron is used. SEM studies show that nano-ordered MgB2 grains are formed, thereby creating large number of grain boundaries responsible for high critical current densities. Analysis of normalized pinning force curve as a function of reduced magnetic field indicates that dominant pinning is caused by grain boundaries.

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