Interactions of Ba2YCu3O6+y with the Gd3NbO7 buffer layer in coated conductors

W. Wong-Ng, Z. Yang, J. A. Kaduk, L. P. Cook, M. Paranthaman

Research output: Contribution to journalArticlepeer-review

1 Scopus citations

Abstract

A systematic study of the chemical interaction of Ba2YCu3O6+y and Gd3NbO7 was conducted under two processing conditions: purified air (21% po2), and 100 Pa po2 (0.1% po2). Phases present along the pseudo-binary join Ba2YCu3O6z and Gd3NbO7 were found to be in two five-phase volumes within the BaO - frac(1, 2) Y2 O3 - frac(1, 2) Gd2 O3 - Nb2 O5 - CuOy system. Three common phases that are present in all samples are (Y,Gd)2Cu2O5, Ba(Y,Gd)2CuO5 and Cu2O or CuO (depending on the processing conditions). The assemblies of phases can be categorized in three regions, with Ba2YCu3O6+y: Gd3NbO7 ratios of (I)<5.5:4.5; (II)=5.5:4.5; and (III)>5.5:4.5. The lowest melting temperature of the system was determined to be ≈938 °C in air, and 850 °C at 100 Pa po2. Structure determinations of two selected phases, Ba2(GdxY1-x)NbO6 (Fm3-m, No. 225), and (GdxY3-x)NbO7 (C2221, No. 20 and Ccmm, No. 63), were completed using the X-ray Rietveld refinement technique. Reference X-ray powder diffraction patterns for selected phases of Ba2(GdxY1-x)NbO6 (x=0.2, 0.4, 0.6, and 0.8) and (GdxY3-x)NbO7 (x=0.6, 1.2, 1.8, 2.4 and 3) have been prepared for inclusion in the Powder Diffraction File (PDF).

Original languageEnglish
Pages (from-to)649-657
Number of pages9
JournalJournal of Solid State Chemistry
Volume183
Issue number3
DOIs
StatePublished - Mar 2010

Keywords

  • BaYCuO and GdNbO interactions
  • Reference X-ray powder patterns
  • Structure of Ba2(GY)NbO and (GdY)NbO
  • Superconductors

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