Phase stability of MgO-doped Nd-Ba-Cu-O seed crystals for cold-seeded, OCMG processing

K. Iida; N. H. Babu; Y. Shi; L. S. Matthews; T. Miyazaki; N. Sakai; M. Murakami; D. A. Cardwell

doi:10.1016/j.physc.2007.01.037

Phase stability of MgO-doped Nd-Ba-Cu-O seed crystals for cold-seeded, OCMG processing

K. Iida, N. H. Babu, Y. Shi, L. S. Matthews, T. Miyazaki, N. Sakai, M. Murakami, D. A. Cardwell

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

4 Citations (Scopus)

Abstract

The thermodynamic stability of MgO-doped Nd_1+xBa_2-xCu₃O_y (x = 0-0.5) has been investigated as a function of solid solution level (x) under various oxygen partial pressures for use as a seed crystal composition in the melt growth of (LRE)-Ba-Cu-O (where LRE = light rare earth) bulk superconductors. The gradient of decomposition temperature, T_p, against solid solution level increases significantly with decreasing oxygen partial pressure, indicating that MgO-doped Nd-Ba-Cu-O (NdBCO) seed crystals should be grown under reduced pO₂ to obtain seeds with high T_p. Based on these results, the optimum cold-seeded processing conditions for the fabrication of single grain GdBCO bulk superconductors containing silver (GdBCO/Ag) under a controlled oxygen partial pressure of 0.01 atm have been determined. The onset T_c of GdBCO/Ag samples grown in air with the optimized seed crystal composition is improved significantly with increasing Ag content, indicating that silver addition to the precursor powder suppresses the formation of Gd-Ba solid solution.

Original language	English
Pages (from-to)	340-343
Number of pages	4
Journal	Physica C: Superconductivity and its applications
Volume	463-465
Issue number	SUPPL.
DOIs	https://doi.org/10.1016/j.physc.2007.01.037
Publication status	Published - 2007 Oct 1

Keywords

Cold-seeding
GdBCO/Ag
MgO-doped NdBCO
Single grain

ASJC Scopus subject areas

Electronic, Optical and Magnetic Materials
Condensed Matter Physics
Energy Engineering and Power Technology
Electrical and Electronic Engineering

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10.1016/j.physc.2007.01.037

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@article{8995623caba44f9ab73a5d43d6030b08,

title = "Phase stability of MgO-doped Nd-Ba-Cu-O seed crystals for cold-seeded, OCMG processing",

abstract = "The thermodynamic stability of MgO-doped Nd1+xBa2-xCu3Oy (x = 0-0.5) has been investigated as a function of solid solution level (x) under various oxygen partial pressures for use as a seed crystal composition in the melt growth of (LRE)-Ba-Cu-O (where LRE = light rare earth) bulk superconductors. The gradient of decomposition temperature, Tp, against solid solution level increases significantly with decreasing oxygen partial pressure, indicating that MgO-doped Nd-Ba-Cu-O (NdBCO) seed crystals should be grown under reduced pO2 to obtain seeds with high Tp. Based on these results, the optimum cold-seeded processing conditions for the fabrication of single grain GdBCO bulk superconductors containing silver (GdBCO/Ag) under a controlled oxygen partial pressure of 0.01 atm have been determined. The onset Tc of GdBCO/Ag samples grown in air with the optimized seed crystal composition is improved significantly with increasing Ag content, indicating that silver addition to the precursor powder suppresses the formation of Gd-Ba solid solution.",

keywords = "Cold-seeding, GdBCO/Ag, MgO-doped NdBCO, Single grain",

author = "K. Iida and Babu, {N. H.} and Y. Shi and Matthews, {L. S.} and T. Miyazaki and N. Sakai and M. Murakami and Cardwell, {D. A.}",

note = "Funding Information: The IRC acknowledges the support of the Engineering and Physical Sciences Research Council (EPSRC) and The Newton Trust.",

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T1 - Phase stability of MgO-doped Nd-Ba-Cu-O seed crystals for cold-seeded, OCMG processing

AU - Iida, K.

AU - Babu, N. H.

AU - Shi, Y.

AU - Matthews, L. S.

AU - Miyazaki, T.

AU - Sakai, N.

AU - Murakami, M.

AU - Cardwell, D. A.

N1 - Funding Information: The IRC acknowledges the support of the Engineering and Physical Sciences Research Council (EPSRC) and The Newton Trust.

PY - 2007/10/1

Y1 - 2007/10/1

N2 - The thermodynamic stability of MgO-doped Nd1+xBa2-xCu3Oy (x = 0-0.5) has been investigated as a function of solid solution level (x) under various oxygen partial pressures for use as a seed crystal composition in the melt growth of (LRE)-Ba-Cu-O (where LRE = light rare earth) bulk superconductors. The gradient of decomposition temperature, Tp, against solid solution level increases significantly with decreasing oxygen partial pressure, indicating that MgO-doped Nd-Ba-Cu-O (NdBCO) seed crystals should be grown under reduced pO2 to obtain seeds with high Tp. Based on these results, the optimum cold-seeded processing conditions for the fabrication of single grain GdBCO bulk superconductors containing silver (GdBCO/Ag) under a controlled oxygen partial pressure of 0.01 atm have been determined. The onset Tc of GdBCO/Ag samples grown in air with the optimized seed crystal composition is improved significantly with increasing Ag content, indicating that silver addition to the precursor powder suppresses the formation of Gd-Ba solid solution.

AB - The thermodynamic stability of MgO-doped Nd1+xBa2-xCu3Oy (x = 0-0.5) has been investigated as a function of solid solution level (x) under various oxygen partial pressures for use as a seed crystal composition in the melt growth of (LRE)-Ba-Cu-O (where LRE = light rare earth) bulk superconductors. The gradient of decomposition temperature, Tp, against solid solution level increases significantly with decreasing oxygen partial pressure, indicating that MgO-doped Nd-Ba-Cu-O (NdBCO) seed crystals should be grown under reduced pO2 to obtain seeds with high Tp. Based on these results, the optimum cold-seeded processing conditions for the fabrication of single grain GdBCO bulk superconductors containing silver (GdBCO/Ag) under a controlled oxygen partial pressure of 0.01 atm have been determined. The onset Tc of GdBCO/Ag samples grown in air with the optimized seed crystal composition is improved significantly with increasing Ag content, indicating that silver addition to the precursor powder suppresses the formation of Gd-Ba solid solution.

KW - Cold-seeding

KW - GdBCO/Ag

KW - MgO-doped NdBCO

KW - Single grain

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Phase stability of MgO-doped Nd-Ba-Cu-O seed crystals for cold-seeded, OCMG processing

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Keywords

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