A thermodynamic study of the phase stability of the mixed rare-earth barium cuprates, RE0.5RE′0.5Ba2Cu3O7-x (RE/RE′BCO, RE = Y, RE′ = Er, Yb) and 'YBCO + 25 wt.% BaF2' was carried out over the temperature range 800-960 °C and pO2 range 3.0 × 10-4 to 2.1 × 10-1 atm O2, using a coulometric titration technique. At temperatures, T, less than the peritectic temperature, Tp, the phase stabilities of the mixed rare-earth compounds lie between the two single rare-earth parent systems. However, at T > Tp the phase stabilities of the mixed rare-earth compounds depend on the solubilities of the rare-earths in the melt. The stability of 'YBCO + BaF2' is reduced compared to pure YBCO and is very close to pure ErBa2Cu3O7-x (ErBCO).
All Science Journal Classification (ASJC) codes
- Electronic, Optical and Magnetic Materials
- Condensed Matter Physics
- Energy Engineering and Power Technology
- Electrical and Electronic Engineering