Synthesis and characterization of LRE1+xBa2-xCu3Oy (LRE

Nd, Eu, Gd, NEG) superconductors: A low oxygen partial pressure (0.05% O2+Ar)

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Abstract

We have investigated the effect of low oxygen partial pressure (pO2 of 0.05%) on the microstructure and magnetic properties of NdBa2Cu3Oy, EuBa2Cu3Oy, GdBa2Cu3Oy, and (Nd, Eu, Gd)Ba2Cu3Oy. The heat treatment profiles for the melt processes were determined according to the peritectic decomposition temperature obtained by thermal analysis. All the samples showed relatively high Tc in the range of 93.6-96.1 K. Optical and scanning electron microscopy showed that in the Gd-123 matrix the secondary phase particles formed sub-micron-sized bundles. The scaling study of the normalized volume pinning forces showed that ΔTc type pinning is dominant in all the samples. The Gd-123 sample exhibits the highest zero-field critical current density of 88 000 A cm-2 at 77 K for the H ∥c-axis, while the highest secondary peak Jc of 65 000 A cm-2 was achieved in Nd123 at 1 T and 77 K for the H ∥c-axis.

Original languageEnglish
Pages (from-to)683-687
Number of pages5
JournalSuperconductor Science and Technology
Volume15
Issue number5
DOIs
Publication statusPublished - 2002 May
Externally publishedYes

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Partial pressure
Thermoanalysis
Superconducting materials
partial pressure
Magnetic properties
Heat treatment
Oxygen
Decomposition
Microstructure
Scanning electron microscopy
oxygen
synthesis
Temperature
bundles
critical current
thermal analysis
heat treatment
current density
magnetic properties
decomposition

ASJC Scopus subject areas

  • Physics and Astronomy (miscellaneous)
  • Condensed Matter Physics
  • Electronic, Optical and Magnetic Materials

Cite this

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title = "Synthesis and characterization of LRE1+xBa2-xCu3Oy (LRE: Nd, Eu, Gd, NEG) superconductors: A low oxygen partial pressure (0.05{\%} O2+Ar)",
abstract = "We have investigated the effect of low oxygen partial pressure (pO2 of 0.05{\%}) on the microstructure and magnetic properties of NdBa2Cu3Oy, EuBa2Cu3Oy, GdBa2Cu3Oy, and (Nd, Eu, Gd)Ba2Cu3Oy. The heat treatment profiles for the melt processes were determined according to the peritectic decomposition temperature obtained by thermal analysis. All the samples showed relatively high Tc in the range of 93.6-96.1 K. Optical and scanning electron microscopy showed that in the Gd-123 matrix the secondary phase particles formed sub-micron-sized bundles. The scaling study of the normalized volume pinning forces showed that ΔTc type pinning is dominant in all the samples. The Gd-123 sample exhibits the highest zero-field critical current density of 88 000 A cm-2 at 77 K for the H ∥c-axis, while the highest secondary peak Jc of 65 000 A cm-2 was achieved in Nd123 at 1 T and 77 K for the H ∥c-axis.",
author = "Muralidhar Miryala and Masato Murakami",
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AU - Miryala, Muralidhar

AU - Murakami, Masato

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N2 - We have investigated the effect of low oxygen partial pressure (pO2 of 0.05%) on the microstructure and magnetic properties of NdBa2Cu3Oy, EuBa2Cu3Oy, GdBa2Cu3Oy, and (Nd, Eu, Gd)Ba2Cu3Oy. The heat treatment profiles for the melt processes were determined according to the peritectic decomposition temperature obtained by thermal analysis. All the samples showed relatively high Tc in the range of 93.6-96.1 K. Optical and scanning electron microscopy showed that in the Gd-123 matrix the secondary phase particles formed sub-micron-sized bundles. The scaling study of the normalized volume pinning forces showed that ΔTc type pinning is dominant in all the samples. The Gd-123 sample exhibits the highest zero-field critical current density of 88 000 A cm-2 at 77 K for the H ∥c-axis, while the highest secondary peak Jc of 65 000 A cm-2 was achieved in Nd123 at 1 T and 77 K for the H ∥c-axis.

AB - We have investigated the effect of low oxygen partial pressure (pO2 of 0.05%) on the microstructure and magnetic properties of NdBa2Cu3Oy, EuBa2Cu3Oy, GdBa2Cu3Oy, and (Nd, Eu, Gd)Ba2Cu3Oy. The heat treatment profiles for the melt processes were determined according to the peritectic decomposition temperature obtained by thermal analysis. All the samples showed relatively high Tc in the range of 93.6-96.1 K. Optical and scanning electron microscopy showed that in the Gd-123 matrix the secondary phase particles formed sub-micron-sized bundles. The scaling study of the normalized volume pinning forces showed that ΔTc type pinning is dominant in all the samples. The Gd-123 sample exhibits the highest zero-field critical current density of 88 000 A cm-2 at 77 K for the H ∥c-axis, while the highest secondary peak Jc of 65 000 A cm-2 was achieved in Nd123 at 1 T and 77 K for the H ∥c-axis.

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