Synthesis and characterization of LRE1+xBa2-xCu3Oy (LRE: Nd, Eu, Gd, NEG) superconductors: A low oxygen partial pressure (0.05% O2+Ar)

Miryala Muralidhar; M. Murakami

doi:10.1088/0953-2048/15/5/309

Synthesis and characterization of LRE_1+xBa_2-xCu₃O_y (LRE: Nd, Eu, Gd, NEG) superconductors: A low oxygen partial pressure (0.05% O₂+Ar)

Miryala Muralidhar, M. Murakami

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

9 Citations (Scopus)

Abstract

We have investigated the effect of low oxygen partial pressure (pO₂ of 0.05%) on the microstructure and magnetic properties of NdBa₂Cu₃O_y, EuBa₂Cu₃O_y, GdBa₂Cu₃O_y, and (Nd, Eu, Gd)Ba₂Cu₃O_y. 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 T_c 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 ΔT_c 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 J_c of 65 000 A cm^-2 was achieved in Nd123 at 1 T and 77 K for the H ∥c-axis.

Original language	English
Pages (from-to)	683-687
Number of pages	5
Journal	Superconductor Science and Technology
Volume	15
Issue number	5
DOIs	https://doi.org/10.1088/0953-2048/15/5/309
Publication status	Published - 2002 May 1
Externally published	Yes

ASJC Scopus subject areas

Ceramics and Composites
Condensed Matter Physics
Metals and Alloys
Electrical and Electronic Engineering
Materials Chemistry

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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 = "Miryala Muralidhar and M. Murakami",

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doi = "10.1088/0953-2048/15/5/309",

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T2 - Nd, Eu, Gd, NEG) superconductors: A low oxygen partial pressure (0.05% O2+Ar)

AU - Muralidhar, Miryala

AU - Murakami, M.

PY - 2002/5/1

Y1 - 2002/5/1

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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Synthesis and characterization of LRE_1+xBa_2-xCu₃O_y (LRE: Nd, Eu, Gd, NEG) superconductors: A low oxygen partial pressure (0.05% O₂+Ar)

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