Gd-Ba-Cu-O bulk superconductors fabricated by a seeded infiltration growth technique under reduced oxygen partial pressure

K. Iida, N. H. Babu, Y. H. Shi, D. A. Cardwell, Masato Murakami

Research output: Contribution to journalArticle

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Abstract

Single-grain Gd-Ba-Cu-O (GdBCO) bulk superconductors have been grown by a seeded infiltration and growth (SIG) technique under a 1% O2+N 2 atmosphere using a generic MgO-doped Nd-Ba-Cu-O (MgO-NdBCO) seed placed on the sample surface at room temperature (the so-called the cold-seeding method). Partial melting of the MgO-NdBCO seeds fabricated in air under notionally identical thermal processing conditions, however, limited the reliability of this bulk GdBCO single-grain process. The observed seed decomposition is attributed to the dependence of the peritectic temperature Tp of MgO-doped Nd1+xBa2-xCu3O y solid solution (MgO-doped Nd-123ss, where ss indicates solid solution) compounds on both oxygen partial pressure during the melt process and the level of solid solution (x). The peritectic decomposition temperature of MgO-doped Nd-123ss, with x ranging from 0 to 0.5 under p(O2) ≤ 1.00 atm, was observed to remain constant at 1120 °C. Tp was observed to decrease linearly as a function of solid solution level, on the other hand, under oxygen partial pressures of both p(O2) ≤ 0.21 and 0.01 atm. Based on these results, MgO-doped NdBCO seed crystals should be grown under reduced oxygen partial pressure in order to obtain a stable MgO-doped NdBCO seed crystal suitable for cold-seeding processes of large-grain (RE)BCO bulk superconductors (where RE is a rare earth element).

Original languageEnglish
Pages (from-to)641-647
Number of pages7
JournalSuperconductor Science and Technology
Volume19
Issue number6
DOIs
Publication statusPublished - 2006 Jun

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infiltration
Infiltration
Partial pressure
Superconducting materials
partial pressure
seeds
Solid solutions
Oxygen
Seed
solid solutions
oxygen
inoculation
Thermal processing (foods)
Decomposition
Crystals
decomposition
Rare earth elements
Temperature
Melting
crystals

ASJC Scopus subject areas

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

Cite this

Gd-Ba-Cu-O bulk superconductors fabricated by a seeded infiltration growth technique under reduced oxygen partial pressure. / Iida, K.; Babu, N. H.; Shi, Y. H.; Cardwell, D. A.; Murakami, Masato.

In: Superconductor Science and Technology, Vol. 19, No. 6, 06.2006, p. 641-647.

Research output: Contribution to journalArticle

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