Refinement of Nd-422 particles in Nd-Ba-Cu-O bulk superconductor

K. Iida; J. Yoshioka; M. Murakami

doi:10.1109/77.919825

Refinement of Nd-422 particles in Nd-Ba-Cu-O bulk superconductor

K. Iida, J. Yoshioka, M. Murakami

Research output: Contribution to journal › Conference article › peer-review

2 Citations (Scopus)

Abstract

We have investigated the effect of oxygen partial pressure, the initial composition, and the addition of CeO₂ and/or Pt on the grain growth of Nd₄Ba₂Cu₂O₁₀ (Nd-422) in the Ba-Cu-O liquid. Logarithmic plots of the mean diameter of Nd-422 under various oxygen levels as a function of the holding time showed the power law behavior with the slope of 1/3, which suggested that the grain growth of Nd-422 could be explained in terms of the Ostwald ripening theory. A reduction of oxygen partial pressure, the shift of the initial composition toward Barich direction, and a combined addition of Pt and CeO₂ could suppress the coarsening of Nd-422. Furthermore, a combination of these techniques was found to be effective in refining the Nd-422 in the Nd-123 matrix, which led to an enhancement of J_c values.

Original language	English
Pages (from-to)	3529-3532
Number of pages	4
Journal	IEEE Transactions on Applied Superconductivity
Volume	11
Issue number	1 III
DOIs	https://doi.org/10.1109/77.919825
Publication status	Published - 2001 Mar 1
Externally published	Yes
Event	2000 Applied Superconductivity Conference - Virginia Beach, VA, United States Duration: 2000 Sep 17 → 2000 Sep 22

Keywords

Coarsening
Fine dispersion
J
Nd-123
Nd-422
T

ASJC Scopus subject areas

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

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title = "Refinement of Nd-422 particles in Nd-Ba-Cu-O bulk superconductor",

abstract = "We have investigated the effect of oxygen partial pressure, the initial composition, and the addition of CeO2 and/or Pt on the grain growth of Nd4Ba2Cu2O10 (Nd-422) in the Ba-Cu-O liquid. Logarithmic plots of the mean diameter of Nd-422 under various oxygen levels as a function of the holding time showed the power law behavior with the slope of 1/3, which suggested that the grain growth of Nd-422 could be explained in terms of the Ostwald ripening theory. A reduction of oxygen partial pressure, the shift of the initial composition toward Barich direction, and a combined addition of Pt and CeO2 could suppress the coarsening of Nd-422. Furthermore, a combination of these techniques was found to be effective in refining the Nd-422 in the Nd-123 matrix, which led to an enhancement of Jc values.",

keywords = "Coarsening, Fine dispersion, J, Nd-123, Nd-422, T",

author = "K. Iida and J. Yoshioka and M. Murakami",

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T1 - Refinement of Nd-422 particles in Nd-Ba-Cu-O bulk superconductor

AU - Iida, K.

AU - Yoshioka, J.

AU - Murakami, M.

PY - 2001/3/1

Y1 - 2001/3/1

N2 - We have investigated the effect of oxygen partial pressure, the initial composition, and the addition of CeO2 and/or Pt on the grain growth of Nd4Ba2Cu2O10 (Nd-422) in the Ba-Cu-O liquid. Logarithmic plots of the mean diameter of Nd-422 under various oxygen levels as a function of the holding time showed the power law behavior with the slope of 1/3, which suggested that the grain growth of Nd-422 could be explained in terms of the Ostwald ripening theory. A reduction of oxygen partial pressure, the shift of the initial composition toward Barich direction, and a combined addition of Pt and CeO2 could suppress the coarsening of Nd-422. Furthermore, a combination of these techniques was found to be effective in refining the Nd-422 in the Nd-123 matrix, which led to an enhancement of Jc values.

AB - We have investigated the effect of oxygen partial pressure, the initial composition, and the addition of CeO2 and/or Pt on the grain growth of Nd4Ba2Cu2O10 (Nd-422) in the Ba-Cu-O liquid. Logarithmic plots of the mean diameter of Nd-422 under various oxygen levels as a function of the holding time showed the power law behavior with the slope of 1/3, which suggested that the grain growth of Nd-422 could be explained in terms of the Ostwald ripening theory. A reduction of oxygen partial pressure, the shift of the initial composition toward Barich direction, and a combined addition of Pt and CeO2 could suppress the coarsening of Nd-422. Furthermore, a combination of these techniques was found to be effective in refining the Nd-422 in the Nd-123 matrix, which led to an enhancement of Jc values.

KW - Coarsening

KW - Fine dispersion

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