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, Naomichi Sakai, Masato Murakami, D. A. Cardwell

Research output: Contribution to journalArticle

4 Citations (Scopus)

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.

Original languageEnglish
Pages (from-to)340-343
Number of pages4
JournalPhysica C: Superconductivity and its Applications
Volume463-465
Issue numberSUPPL.
DOIs
Publication statusPublished - 2007 Oct 1

Fingerprint

Phase stability
Partial pressure
seeds
Solid solutions
Oxygen
partial pressure
Silver
Crystals
Superconducting materials
solid solutions
Processing
crystals
oxygen
silver
Chemical analysis
Powders
Rare earths
Seed
Thermodynamic stability
Decomposition

Keywords

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

ASJC Scopus subject areas

  • Condensed Matter Physics

Cite this

Phase stability of MgO-doped Nd-Ba-Cu-O seed crystals for cold-seeded, OCMG processing. / Iida, K.; Babu, N. H.; Shi, Y.; Matthews, L. S.; Miyazaki, T.; Sakai, Naomichi; Murakami, Masato; Cardwell, D. A.

In: Physica C: Superconductivity and its Applications, Vol. 463-465, No. SUPPL., 01.10.2007, p. 340-343.

Research output: Contribution to journalArticle

Iida, K. ; Babu, N. H. ; Shi, Y. ; Matthews, L. S. ; Miyazaki, T. ; Sakai, Naomichi ; Murakami, Masato ; Cardwell, D. A. / Phase stability of MgO-doped Nd-Ba-Cu-O seed crystals for cold-seeded, OCMG processing. In: Physica C: Superconductivity and its Applications. 2007 ; Vol. 463-465, No. SUPPL. pp. 340-343.
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