Processing Dependence of Texture, and Critical Properties of YBa₂Cu₃O_2-δ Films on RABiTS Substrates by a Non-Fluorine MOD Method

Journal Article · Sat Dec 31 23:00:00 EST 2005 · Journal of the American Ceramic Society

DOI:https://doi.org/10.1111/j.1551-2916.2005.00821.x· OSTI ID:1003650

Xu, Y. ^[1]; Goyal, Amit ^[2]; Leonard, Keith J ^[2]; Specht, Eliot D ^[2]; Shi, D. ^[1]; Paranthaman, Mariappan Parans ^[2]

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1. University of Cincinnati
2. ORNL

YBa2Cu3O7-{delta} (YBCO or Y123) films on rolling-assisted biaxially textured substrates (RABiTS) were prepared via a fluorine-free metallorganic deposition (MOD) through spin coating, burnout, and high temperature anneal. The effects of substrate texture and surface energy of the CeO2 cap layer were investigated. Except for the commonly accepted key factors, such as the textures of substrate and buffer layers, we found some other factors, for example, the deposition temperature of the cap layer, are also critical to the epitaxial growth of Y123 phase. With the CeO2 cap layer deposited at relative high temperature of 700C, a critical current density, Jc, over 1 MA/cm2 has been demonstrated for the first time on Ni-RABiTS by a fluorine-free MOD method. Whereas for samples with CeO2 cap layers deposited at a lower temperature of 600C, even though XRD data showed a better texture on these buffer layers, texture degradations of YBCO grains under the optimized processing conditions were observed and a lower oxygen partial pressure around 40 ppm was necessary for the epitaxial growth of Y123 phase. As a result, Jc fell to 0.45 MA/cm2 at 77 K. The observed phenomena points to the change of surface energy and reactivity of the CeO2 cap layer with respect to the CeO2 deposition temperature. In this paper, the YBCO phase diagram was also summarized.

• Research Organization: Oak Ridge National Laboratory (ORNL)
• Sponsoring Organization: OE USDOE - Office of Electric Transmission and Distribution
• DOE Contract Number: AC05-00OR22725
• OSTI ID: 1003650
• Journal Information: Journal of the American Ceramic Society, Journal Name: Journal of the American Ceramic Society Journal Issue: (3) Vol. 89; ISSN 1551-2916; ISSN 0002-7820
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
BUFFERS
BURNOUT
CRITICAL CURRENT
DEPOSITION
OXYGEN
PARTIAL PRESSURE
PHASE DIAGRAMS
PROCESSING
SPIN
SUBSTRATES
SURFACE ENERGY
TEXTURE
X-RAY DIFFRACTION