Effects of second phase and platinum additions on the microstructure and the critical current density of OCMG processed (Nd, Eu, Gd)-Ba-Cu-O

Muralidhar Miryala, T. Saitoh, K. Segawa, Masato Murakami

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Abstract

We have investigated the effects of second phase (Nd, Eu, Gd)2BaCuO5 (NEG211) and platinum addition on the superconducting properties for (Nd, Eu, Gd)Ba2CUsOy (NEG123) composite prepared by the oxygen-controlled melt-growth (OCMG) process. The addition of NEG211 slightly decreased the critical temperature (Tc) and increased the critical current density (Jc), particularly in a low field region. The secondary peak effect, which is commonly observed in OCMG processed Nd123, was reduced with the NEG211 addition of >10%. Refinement of the NEG211 second phase was achieved by Pt addition, which led to a dramatic increase in both Jc values and the irreversibility field. Low field Jc varied as Vf/d, where Vfis the volume fraction and d is the mean diameter of NEG211, supporting the idea that the 211/123 matrix is responsible for the pinning-like melt-processed Y-Ba-Cu -O. However, in a high field region, due to the presence of additional pinning by field-induced pinning centers, such a relationship is not observed. Our results suggests that fine distribution of the second phase is effective in improving pinning properties in the (Nd, Eu, Gd)-Ba-Cu-O composite.

Original languageEnglish
Pages (from-to)535-546
Number of pages12
JournalApplied Superconductivity
Volume4
Issue number10-11
DOIs
Publication statusPublished - 1996 Oct 1
Externally publishedYes

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Platinum
critical current
platinum
current density
microstructure
Microstructure
Oxygen
Composite materials
oxygen
Volume fraction
composite materials
critical temperature
Temperature
matrices

ASJC Scopus subject areas

  • Engineering(all)
  • Physics and Astronomy(all)

Cite this

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title = "Effects of second phase and platinum additions on the microstructure and the critical current density of OCMG processed (Nd, Eu, Gd)-Ba-Cu-O",
abstract = "We have investigated the effects of second phase (Nd, Eu, Gd)2BaCuO5 (NEG211) and platinum addition on the superconducting properties for (Nd, Eu, Gd)Ba2CUsOy (NEG123) composite prepared by the oxygen-controlled melt-growth (OCMG) process. The addition of NEG211 slightly decreased the critical temperature (Tc) and increased the critical current density (Jc), particularly in a low field region. The secondary peak effect, which is commonly observed in OCMG processed Nd123, was reduced with the NEG211 addition of >10{\%}. Refinement of the NEG211 second phase was achieved by Pt addition, which led to a dramatic increase in both Jc values and the irreversibility field. Low field Jc varied as Vf/d, where Vfis the volume fraction and d is the mean diameter of NEG211, supporting the idea that the 211/123 matrix is responsible for the pinning-like melt-processed Y-Ba-Cu -O. However, in a high field region, due to the presence of additional pinning by field-induced pinning centers, such a relationship is not observed. Our results suggests that fine distribution of the second phase is effective in improving pinning properties in the (Nd, Eu, Gd)-Ba-Cu-O composite.",
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T1 - Effects of second phase and platinum additions on the microstructure and the critical current density of OCMG processed (Nd, Eu, Gd)-Ba-Cu-O

AU - Miryala, Muralidhar

AU - Saitoh, T.

AU - Segawa, K.

AU - Murakami, Masato

PY - 1996/10/1

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N2 - We have investigated the effects of second phase (Nd, Eu, Gd)2BaCuO5 (NEG211) and platinum addition on the superconducting properties for (Nd, Eu, Gd)Ba2CUsOy (NEG123) composite prepared by the oxygen-controlled melt-growth (OCMG) process. The addition of NEG211 slightly decreased the critical temperature (Tc) and increased the critical current density (Jc), particularly in a low field region. The secondary peak effect, which is commonly observed in OCMG processed Nd123, was reduced with the NEG211 addition of >10%. Refinement of the NEG211 second phase was achieved by Pt addition, which led to a dramatic increase in both Jc values and the irreversibility field. Low field Jc varied as Vf/d, where Vfis the volume fraction and d is the mean diameter of NEG211, supporting the idea that the 211/123 matrix is responsible for the pinning-like melt-processed Y-Ba-Cu -O. However, in a high field region, due to the presence of additional pinning by field-induced pinning centers, such a relationship is not observed. Our results suggests that fine distribution of the second phase is effective in improving pinning properties in the (Nd, Eu, Gd)-Ba-Cu-O composite.

AB - We have investigated the effects of second phase (Nd, Eu, Gd)2BaCuO5 (NEG211) and platinum addition on the superconducting properties for (Nd, Eu, Gd)Ba2CUsOy (NEG123) composite prepared by the oxygen-controlled melt-growth (OCMG) process. The addition of NEG211 slightly decreased the critical temperature (Tc) and increased the critical current density (Jc), particularly in a low field region. The secondary peak effect, which is commonly observed in OCMG processed Nd123, was reduced with the NEG211 addition of >10%. Refinement of the NEG211 second phase was achieved by Pt addition, which led to a dramatic increase in both Jc values and the irreversibility field. Low field Jc varied as Vf/d, where Vfis the volume fraction and d is the mean diameter of NEG211, supporting the idea that the 211/123 matrix is responsible for the pinning-like melt-processed Y-Ba-Cu -O. However, in a high field region, due to the presence of additional pinning by field-induced pinning centers, such a relationship is not observed. Our results suggests that fine distribution of the second phase is effective in improving pinning properties in the (Nd, Eu, Gd)-Ba-Cu-O composite.

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