Effect of platinum addition on the microstructure and critical current density in (Nd, Eu, Gd)-Ba-Cu-O

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Abstract

We have studied the microstructure and magnetic properties of oxygen-controlled-melt-growth (OCMG) processed (Nd, Eu, Gd)-Ba-Cu-O superconductors, which contain about 40 mol% of (Nd, Eu, Gd)2BaCuO5 (NEG211) second phase by varying the amount of Pt from 0.25 to 3 mol%. Scanning electron and transmission electron microscopic observations demonstrate that 0.5 mol% Pt is the optimum quantity to refine the 211 particles, leading to a dramatic increase in the critical current density. An addition of 2-3 mol% Pt results in the formation of relatively large NEG211 particles. Jc values increase with increasing Pt content up to 0.5 mol% and then decrease thereafter. A high critical current density of 70 000 A cm-2 at T = 77 K and an applied field of 2.2 T (H ∥ c axis) is achieved in the sample with 0.5 mol% Pt. Our results demonstrate that the Pt addition is critical to the refinement of the 211 particle size and thus for the enhancement of the critical current density.

Original languageEnglish
Pages (from-to)105-109
Number of pages5
JournalSuperconductor Science and Technology
Volume12
Issue number2
DOIs
Publication statusPublished - 1999 Feb
Externally publishedYes

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Platinum
critical current
platinum
current density
microstructure
Microstructure
Electrons
Superconducting materials
Magnetic properties
Particle size
Oxygen
Scanning
electrons
magnetic properties
scanning
augmentation
oxygen

ASJC Scopus subject areas

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

Cite this

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title = "Effect of platinum addition on the microstructure and critical current density in (Nd, Eu, Gd)-Ba-Cu-O",
abstract = "We have studied the microstructure and magnetic properties of oxygen-controlled-melt-growth (OCMG) processed (Nd, Eu, Gd)-Ba-Cu-O superconductors, which contain about 40 mol{\%} of (Nd, Eu, Gd)2BaCuO5 (NEG211) second phase by varying the amount of Pt from 0.25 to 3 mol{\%}. Scanning electron and transmission electron microscopic observations demonstrate that 0.5 mol{\%} Pt is the optimum quantity to refine the 211 particles, leading to a dramatic increase in the critical current density. An addition of 2-3 mol{\%} Pt results in the formation of relatively large NEG211 particles. Jc values increase with increasing Pt content up to 0.5 mol{\%} and then decrease thereafter. A high critical current density of 70 000 A cm-2 at T = 77 K and an applied field of 2.2 T (H ∥ c axis) is achieved in the sample with 0.5 mol{\%} Pt. Our results demonstrate that the Pt addition is critical to the refinement of the 211 particle size and thus for the enhancement of the critical current density.",
author = "Muralidhar Miryala and Koblischka, {Michael Rudolf} and Masato Murakami",
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TY - JOUR

T1 - Effect of platinum addition on the microstructure and critical current density in (Nd, Eu, Gd)-Ba-Cu-O

AU - Miryala, Muralidhar

AU - Koblischka, Michael Rudolf

AU - Murakami, Masato

PY - 1999/2

Y1 - 1999/2

N2 - We have studied the microstructure and magnetic properties of oxygen-controlled-melt-growth (OCMG) processed (Nd, Eu, Gd)-Ba-Cu-O superconductors, which contain about 40 mol% of (Nd, Eu, Gd)2BaCuO5 (NEG211) second phase by varying the amount of Pt from 0.25 to 3 mol%. Scanning electron and transmission electron microscopic observations demonstrate that 0.5 mol% Pt is the optimum quantity to refine the 211 particles, leading to a dramatic increase in the critical current density. An addition of 2-3 mol% Pt results in the formation of relatively large NEG211 particles. Jc values increase with increasing Pt content up to 0.5 mol% and then decrease thereafter. A high critical current density of 70 000 A cm-2 at T = 77 K and an applied field of 2.2 T (H ∥ c axis) is achieved in the sample with 0.5 mol% Pt. Our results demonstrate that the Pt addition is critical to the refinement of the 211 particle size and thus for the enhancement of the critical current density.

AB - We have studied the microstructure and magnetic properties of oxygen-controlled-melt-growth (OCMG) processed (Nd, Eu, Gd)-Ba-Cu-O superconductors, which contain about 40 mol% of (Nd, Eu, Gd)2BaCuO5 (NEG211) second phase by varying the amount of Pt from 0.25 to 3 mol%. Scanning electron and transmission electron microscopic observations demonstrate that 0.5 mol% Pt is the optimum quantity to refine the 211 particles, leading to a dramatic increase in the critical current density. An addition of 2-3 mol% Pt results in the formation of relatively large NEG211 particles. Jc values increase with increasing Pt content up to 0.5 mol% and then decrease thereafter. A high critical current density of 70 000 A cm-2 at T = 77 K and an applied field of 2.2 T (H ∥ c axis) is achieved in the sample with 0.5 mol% Pt. Our results demonstrate that the Pt addition is critical to the refinement of the 211 particle size and thus for the enhancement of the critical current density.

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