Optimization of Mg Precursor Concentration to Obtain High Jc in MgB2 Synthesized with Ag Addition and Carbon Encapsulated Boron

Sai Srikanth Arvapalli, Muralidhar Miryala, Masato Murakami

Research output: Contribution to journalArticle

Abstract

In this work, we report an optimum amount of Mg precursor required for obtaining high critical current density (Jc) of bulk MgB2 superconductor synthesized via solid state sintering. We add a slight excess of Mg precursor to balance its losses while formation of pinning phases and impurities such as Ag-Mg phases and MgO, respectively. Several amounts of Mg had been varied such as x = 1.05, 1.075, 1.1, 1.125, and 1.15 in MgxB2. To obtain the best critical current density values, we used carbon encapsulated boron (1.5% carbon) and added 4 wt% Ag. The X-ray diffraction analysis showed the presence of AgMg and AgMg3 phases and a minute amount of MgO. The SQUID measurements indicated that highest Jc of 350 kA/cm2 at 20 K and self-field in sample with x = 1.075. All results analyzed explain the improved critical current performance based on nanometer-sized Ag-Mg particles in the final product.

Original languageEnglish
Article number8000904
JournalIEEE Transactions on Applied Superconductivity
Volume29
Issue number5
DOIs
Publication statusPublished - 2019 Jan 1

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Boron
critical current
boron
Carbon
Critical current density (superconductivity)
optimization
carbon
Critical currents
SQUIDs
X ray diffraction analysis
current density
Superconducting materials
Sintering
Impurities
sintering
solid state
impurities
products
diffraction
x rays

Keywords

  • Ag addition
  • critical current density (Jc)
  • MgB
  • precursor optimization

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics
  • Electrical and Electronic Engineering

Cite this

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title = "Optimization of Mg Precursor Concentration to Obtain High Jc in MgB2 Synthesized with Ag Addition and Carbon Encapsulated Boron",
abstract = "In this work, we report an optimum amount of Mg precursor required for obtaining high critical current density (Jc) of bulk MgB2 superconductor synthesized via solid state sintering. We add a slight excess of Mg precursor to balance its losses while formation of pinning phases and impurities such as Ag-Mg phases and MgO, respectively. Several amounts of Mg had been varied such as x = 1.05, 1.075, 1.1, 1.125, and 1.15 in MgxB2. To obtain the best critical current density values, we used carbon encapsulated boron (1.5{\%} carbon) and added 4 wt{\%} Ag. The X-ray diffraction analysis showed the presence of AgMg and AgMg3 phases and a minute amount of MgO. The SQUID measurements indicated that highest Jc of 350 kA/cm2 at 20 K and self-field in sample with x = 1.075. All results analyzed explain the improved critical current performance based on nanometer-sized Ag-Mg particles in the final product.",
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author = "Arvapalli, {Sai Srikanth} and Muralidhar Miryala and Masato Murakami",
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AU - Arvapalli, Sai Srikanth

AU - Miryala, Muralidhar

AU - Murakami, Masato

PY - 2019/1/1

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N2 - In this work, we report an optimum amount of Mg precursor required for obtaining high critical current density (Jc) of bulk MgB2 superconductor synthesized via solid state sintering. We add a slight excess of Mg precursor to balance its losses while formation of pinning phases and impurities such as Ag-Mg phases and MgO, respectively. Several amounts of Mg had been varied such as x = 1.05, 1.075, 1.1, 1.125, and 1.15 in MgxB2. To obtain the best critical current density values, we used carbon encapsulated boron (1.5% carbon) and added 4 wt% Ag. The X-ray diffraction analysis showed the presence of AgMg and AgMg3 phases and a minute amount of MgO. The SQUID measurements indicated that highest Jc of 350 kA/cm2 at 20 K and self-field in sample with x = 1.075. All results analyzed explain the improved critical current performance based on nanometer-sized Ag-Mg particles in the final product.

AB - In this work, we report an optimum amount of Mg precursor required for obtaining high critical current density (Jc) of bulk MgB2 superconductor synthesized via solid state sintering. We add a slight excess of Mg precursor to balance its losses while formation of pinning phases and impurities such as Ag-Mg phases and MgO, respectively. Several amounts of Mg had been varied such as x = 1.05, 1.075, 1.1, 1.125, and 1.15 in MgxB2. To obtain the best critical current density values, we used carbon encapsulated boron (1.5% carbon) and added 4 wt% Ag. The X-ray diffraction analysis showed the presence of AgMg and AgMg3 phases and a minute amount of MgO. The SQUID measurements indicated that highest Jc of 350 kA/cm2 at 20 K and self-field in sample with x = 1.075. All results analyzed explain the improved critical current performance based on nanometer-sized Ag-Mg particles in the final product.

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