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
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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10.1109/77.919825

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@article{97f25d861a054129bd6365ec03bbf89c,

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",

note = "Funding Information: Received September 17, 2000. This work was supported by New Energy and Industrial Technology Development Organization (NEDO) as Collaborative Research and Development of Fundamental Technology for Superconductivity Applications under the New Sunshine Program administered by the Agency of Industrial Science and Technology (AIST) of the Ministry of International and Industry (MITI) of Japan. K. lida is with the International Superconductivity Technology Center, Superconductivity Research Laboratory, Div. 111, 3-35-2 Iioka-Shinden, Morioka, lwate 020-0852 Japan (telephone: 81-19-635-9015, e-mail: iida@istec.or.jp). J. Yoshioka is with the International Superconductivity Technology Center, Superconductivity Research Laboratory, Div. 111, 3-35-2 Iioka-Shinden, Morioka, Iwate 020-0852 Japan (telephone: 8 1-19-635-9015, e-mail: yoshioka@istec.or.jp). M. Murakami is with the International Superconductivity Technology Center, Superconductivity Research Laboratory, Div. Ill, 1-16-25 Shibaura, Minato-ku, Tokyo 105-0023 Japan (telephone: 8 1-3-3454-9284, e-mail: murakami@istec.or.jp). Copyright: Copyright 2008 Elsevier B.V., All rights reserved.; 2000 Applied Superconductivity Conference ; Conference date: 17-09-2000 Through 22-09-2000",

year = "2001",

month = mar,

doi = "10.1109/77.919825",

language = "English",

volume = "11",

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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.

N1 - Funding Information: Received September 17, 2000. This work was supported by New Energy and Industrial Technology Development Organization (NEDO) as Collaborative Research and Development of Fundamental Technology for Superconductivity Applications under the New Sunshine Program administered by the Agency of Industrial Science and Technology (AIST) of the Ministry of International and Industry (MITI) of Japan. K. lida is with the International Superconductivity Technology Center, Superconductivity Research Laboratory, Div. 111, 3-35-2 Iioka-Shinden, Morioka, lwate 020-0852 Japan (telephone: 81-19-635-9015, e-mail: iida@istec.or.jp). J. Yoshioka is with the International Superconductivity Technology Center, Superconductivity Research Laboratory, Div. 111, 3-35-2 Iioka-Shinden, Morioka, Iwate 020-0852 Japan (telephone: 8 1-19-635-9015, e-mail: yoshioka@istec.or.jp). M. Murakami is with the International Superconductivity Technology Center, Superconductivity Research Laboratory, Div. Ill, 1-16-25 Shibaura, Minato-ku, Tokyo 105-0023 Japan (telephone: 8 1-3-3454-9284, e-mail: murakami@istec.or.jp). Copyright: Copyright 2008 Elsevier B.V., All rights reserved.

PY - 2001/3

Y1 - 2001/3

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

KW - J

KW - Nd-123

KW - Nd-422

KW - T

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DO - 10.1109/77.919825

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EP - 3532

JO - IEEE Transactions on Applied Superconductivity

JF - IEEE Transactions on Applied Superconductivity

SN - 1051-8223

IS - 1 III

T2 - 2000 Applied Superconductivity Conference

Y2 - 17 September 2000 through 22 September 2000

ER -

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

Abstract

Keywords

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