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Interfacial reactions of Ba2YCu3O6+x with Coated Conductor Buffer Layer, LaMnO3

Published

Author(s)

Winnie K. Wong-Ng, Guangyao Liu, Lawrence P. Cook, James A. Kaduk

Abstract

Chemical interactions between the Ba2YCu3O6+x superconductor and the LaMnO3 buffer layers employed in coated conductors have been investigated experimentally by determining the phases formed in the Ba2YCu3O6+x - LaMnO3 system. The Ba2YCu3O6+x - LaMnO3 join within the BaO-(Y2O3-La2O3)-MnO2-CuOx multi-component system is non-binary. At 810 C (pO2 = 100 Pa) and at 950 C in purified air, four phases are consistently present along the join, namely, Ba2-x(La1+x-yYy)Cu3O6+z, Ba(Y2-xLax)CuO5, (La1-xYx)MnO3, (La,Y)Mn2O5. The crystal chemistry and crystallography of Ba(Y2-xLax)CuO5 and (La1-xYx)Mn2O5 were studied using the X-ray Reitveld refinement technique. The Y-rich and La-rich solid solution limits for Ba(Y2-xLax)CuO5 are Ba(Y1.8La0.2)CuO5 and Ba(Y0.1La1.9)CuO5, respectively. The structure of Ba(Y1.8La0.2)CuO5 is Pnma (No. 62), a = 12.2161(5) Å, b = 5.6690(2) Å, c = 7.1468(3) Å, V = 494.94 (4), and Dx = 6.29 g.cm-3. No solid solution for (La1-xYx)Mn2O5 was found at 950 C (in air) or at 810C (pO2 = 100 Pa). The structure of YMn2O5 was determined to be Pbam (No.55), a= 7.27832(14) Å, b=8.46707(14) Å, c= 5.66495(10) Å, and V= 349.108(14) Å3.
Citation
Solid State Sciences
Volume
470

Keywords

coated conductor, Ba2YCu3O6+x/LaMnO3 interaction, Ba(Y1-xLax)2CuO5, (La1-xYx)Mn2O5

Citation

Wong-Ng, W. , Liu, G. , Cook, L. and Kaduk, J. (2010), Interfacial reactions of Ba2YCu3O6+x with Coated Conductor Buffer Layer, LaMnO3, Solid State Sciences (Accessed April 16, 2024)
Created February 10, 2010, Updated February 19, 2017