Phase equilibria of Ba–R–Cu–O for coated conductor applications (R = lanthanides and Y)

✍ Scribed by W. Wong-Ng; L.P. Cook; I. Levin; J. Suh; R. Feenstra; T. Haugan; P. Barnes

• Publisher: Elsevier Science
• Year: 2004
• Tongue: English
• Weight: 285 KB
• Volume: 408-410
• Category: Article
• ISSN: 0921-4534
• DOI: 10.1016/j.physc.2004.02.019

✦ Synopsis

Phase diagrams of the Ba 2 RCu 3 O 6þx (R ¼ Nd, Sm, Gd, Y, and Er) superconductors, prepared under 100 Pa O 2 at 810 °C, reflect the trend of the lanthanide contraction. The single-phase regions of Ba 2Àx (Nd 1þxÀy R 0 y )Cu 3 O 6þz for R 0 ¼ Gd, Y and Yb, and of Ba 2Àx (R 1þxÀy Y y )Cu 3 O 6þz for R ¼ Eu and Gd were determined. Using these data, both fluxpinning and melting properties can be tailored and optimized. The presence of a low temperature melt during formation of the Ba 2 YCu 3 O 6þx phase from barium fluoride amorphous precursor films is deemed important for producing quality tapes, and hence for rapid advancement of second-generation RABiTS/IBAD coated conductor technology. Our search for low melting liquid has focused on compositional vectors within the Ba, Y, CukO, F reciprocal system. Published by Elsevier B.V.