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Publication Citation: Phase Equilibria of BaO-R2O3-CuOz Systems (R=Y and Lanthanides) Under CO2-Free Conditions

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Author(s): Winnie K. Wong-Ng; Z Yang; Lawrence P. Cook; Julia Frank; Mario Loung; Qingzhen Huang;
Title: Phase Equilibria of BaO-R2O3-CuOz Systems (R=Y and Lanthanides) Under CO2-Free Conditions
Published: March 13, 2007
Abstract: For applications of phase equilibria to the processing of second-generation high Tc superconductor-coated-conductors, phase diagrams constructed under carbonate-free conditions are needed. Subsolidus phase equilibria of BaO-R2O3-CuOz (R=Ho) have been investigated at pO2 = 100 Pa (810 C), 21 kPa (930 C), and 0.1 MPa (850 C and 930 C) by applying controlled atmosphere methods to minimize the presence of carbonate and CO2 and H2O contamination. Under carbonate-free conditions, most of these phase diagrams are different from those reported in the literature. In this paper, we also summarize and compare the phase diagrams of ten BaO-R2O3-CuOx systems (R=Nd, Sm, Eu, Gd, Dy, Y, Ho, Er, Tm and Yb) that were previously determined in this laboratory under pO2 = 100 Pa. Among these diagrams, a distinct trend of phase formation and tie-line relationships is observed.
Citation: Journal of Electronic Materials
Volume: 36
Issue: 10
Pages: pp. 1279 - 1287
Keywords: (R=lanthanides and Y) systems;BaO-R2O3-CuOz;CO2-free conditions;coated conductors;phase diagrams
Research Areas: Ceramics, Materials Science