Phase Equilibria of BaO-R2O3-CuOz Systems (R=Y and Lanthanides) Under CO2-Free Conditions
Winnie K. Wong-Ng, Z Yang, Lawrence P. Cook, Julia Frank, Mario Loung, Qingzhen Huang
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.
, Yang, Z.
, Cook, L.
, Frank, J.
, Loung, M.
and Huang, Q.
Phase Equilibria of BaO-R<sub>2</sub>O<sub>3</sub>-CuO<sub>z</sub> Systems (R=Y and Lanthanides) Under CO<sub>2</sub>-Free Conditions, Journal of Electronic Materials
(Accessed June 4, 2023)