Title of article :
Interactions of Ba2YCu3O6+y with the Gd3NbO7 buffer layer in coated conductors
Author/Authors :
W. Wong-Ng، نويسنده , , Z. Yang، نويسنده , , J.A. Kaduk، نويسنده , , L.P. Cook، نويسنده , , M. Paranthaman، نويسنده ,
Issue Information :
روزنامه با شماره پیاپی سال 2010
Abstract :
A systematic study of the chemical interaction of Ba2YCu3O6+y and Gd3NbO7 was conducted under two processing conditions: purified air (21% po2po2), and 100 Pa po2po2 (0.1% po2po2). Phases present along the pseudo-binary join Ba2YCu3O6z and Gd3NbO7 were found to be in two five-phase volumes within the View the MathML sourceBaO−12Y2O3−12Gd2O3−Nb2O5−CuOy system. Three common phases that are present in all samples are (Y,Gd)2Cu2O5, Ba(Y,Gd)2CuO5 and Cu2O or CuO (depending on the processing conditions). The assemblies of phases can be categorized in three regions, with Ba2YCu3O6+y : Gd3NbO7 ratios of (I)<5.5:4.5; (II)=5.5:4.5; and (III)>5.5:4.5. The lowest melting temperature of the system was determined to be ≈938 °C in air, and 850 °C at 100 Pa po2po2. Structure determinations of two selected phases, Ba2(GdxY1−x)NbO6 (Fm3¯m, No. 225), and (GdxY3−x)NbO7 (C2221, No. 20 and Ccmm, No. 63), were completed using the X-ray Rietveld refinement technique. Reference X-ray powder diffraction patterns for selected phases of Ba2(GdxY1−x)NbO6 (x=0.2, 0.4, 0.6, and 0.8) and (GdxY3−x)NbO7 (x=0.6, 1.2, 1.8, 2.4 and 3) have been prepared for inclusion in the Powder Diffraction File (PDF).
Keywords :
Superconductors , Reference X-ray powder patterns , Ba2YCu3O6z and Gd3NbO7 interactions , Structure of Ba2(GdxY1?x)NbO6 and (GdxY3?x)NbO7
Journal title :
JOURNAL OF SOLID STATE CHEMISTRY
Journal title :
JOURNAL OF SOLID STATE CHEMISTRY