Phase evolution in Ba-(Nd,Eu,Gd)-Cu-O-coated conductor films

Wong-Ng, W.; Levin, I.; Ritter, J.; Cook, L. P.; Liu, G.; Otani, M.; Vaudin, M.; Lucas, C.; Diwanji, S. P.; Feenstra, R.
August 2008
Journal of Materials Research;Aug2008, Vol. 23 Issue 8, p4
Academic Journal
Phases that are in equilibrium with BaR2CuO6+χ (R=lanthanides and Y), such as the "green-phase" and "brown-phase" structural variants of BaR2CuO5 in bulk samples, are attractive choices for flux-pinning for coated conductor applications because of the guaranteed chemical stability. In films, high-temperature x-ray diffraction studies of Ba2RCu3O6+χ superconductor deposited on SrTiO3 substrate using the trifluoroacetate solution method demonstrate that while BaNd2CuO5 ("brown-phase" structure) develops at 735 °C and 100 Pa pO2, neither BaGd2CuO5 nor Ba(Nd1/3Eu1/3Gd1/3)2CuO5 (both green-phase structure) form at these conditions. As a result, Ba2(Nd1/3Eu1/3Gd1/3)Cu3O6+χ in thin films is in equilibrium with the brown-phase, and Ba2GdCu3O6+χ is in equilibrium with Gd2O3 in the Ba-Gd-Cu-O system, in contrast to the bulk systems. Different phase relationships in the vicinity of the Ba2RCu3O6+χ phase imply different phases are available for flux-pinning applications. These differences will need to be considered carefully in designing optimized superconducting coated conductors.


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