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Phase Relations in Ba-(Nd,Eu,Gd)-Cu-O Coated Conductor Films



Winnie Wong-Ng, Igor Levin, Joseph J. Ritter, Lawrence P. Cook, Guangyao Liu, Makoto Otani, Christopher E. Lucas, Shailee P. Diwanji, Ron Feenstra, P Goyal, Mark D. Vaudin


Knowledge of phase relations in thin films of Ba2RCu3O6+x (where R=lanthanides or mixed lanthanides) is needed to guide the processing of coated conductors. High-temperature X-ray diffraction studies of Ba2RCu3O6+x films deposited using the trifluoroacetate solution on SrTiO3 demonstrate that while BaNd2CuO5 ( brown-phase structure) develops at 735 C and 100 Pa pO2, neither BaGd2CuO5 nor Ba(Nd1/3Eu1/3Gd1/3)2CuO5 ( green-phase structure) form at these conditions. As a result, Ba2(Nd1/3Eu1/3Gd1/3)Cu3O6+x in thin films is in equilibrium with the brown-phase , and a tie-line is found between the Ba2GdCu3O6+x and Gd2O3 in the BaO-poor region of the Ba-Gd-Cu-O diagram, in contrast to the bulk phase diagram.
Applied Physics Letters


Ba2RCu3O6+x (R=lanthanides), coated conductor, phase relations in films


Wong-Ng, W. , Levin, I. , Ritter, J. , Cook, L. , Liu, G. , Otani, M. , Lucas, C. , Diwanji, S. , Feenstra, R. , Goyal, P. and Vaudin, M. (2017), Phase Relations in Ba-(Nd,Eu,Gd)-Cu-O Coated Conductor Films, Applied Physics Letters (Accessed May 19, 2024)


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Created February 19, 2017