Pseudo-binary phase diagram along NdBa₂Cu₃O_y-Ba₃Cu₅O_z under pO₂ of 0.01 atm

We report the NdBa₂Cu₃O_y (Nd123)-Ba₃Cu₅O_z(035) pseudo-binary section in the Nd₂O₃-BaO-CuO system under the oxygen partial pressure pO₂ = 0.01 atm. We performed thermogravitational and differential thermal analysis (TG-DTA) and powder x-ray diffraction (XRD) measurements for quenched samples. We also performed high-temperature XRD for the determination of equilibrium solid phases at elevated temperatures. In situ observation of the primary solid phases with laser scanning microscopy was also performed for an accurate determination of the liquidus line. In comparison with the Nd123-035 pseudo-binary phase diagram in air, the liquidus line under pO₂ = 0.01 atm shifts to a lower temperature.