Subsolidus phase relationships of the BaO–R2O3–CuOz (R=Tm and Yb) systems under carbonate-free conditions at =100Pa, and T=750°C and 810°C

Phase Equilibria of BaO-R2O3-CuO z Systems (R = Y and Lanthanides) under CO2-free Conditions

“…[9][10][11][12][13][14] The experimental procedure for the study of the BaOHo 2 O 3 -CuO z system under purified air (p O 2 = 21 kPa, or 21% O 2 by volume fraction in Ar, 875°C) and 0.1 MPa p O 2 (100% O 2 by volume fraction at 850 and 930°C) is given below.…”

“…2a-j. [9][10][11][12][13][14] For ease of comparison, the diagram for R=Ho (Fig. 1a) is repeated here as Fig.…”

“…The first goal is to summarize and compare the phase diagrams of the ten BaO-R 2 O 3 -CuO z systems (R = Nd, Sm, Eu, Gd, Dy, Y, Ho, Er, Tm and Yb) that were previously prepared in our laboratory under carbonate-free conditions (T = 810°C, p O 2 = 100 Pa). [9][10][11][12][13][14] This set of experimental conditions was chosen to match the processing conditions of the IBAD and RABiTS films. Although various phase diagrams of the BaO-R 2 O 3 -CuO z systems are available in literature, 7,15-22 the majority of these diagrams were prepared using BaCO 3 as one of the starting reagents, undoubtedly because of the difficulty in handling BaO.…”