Abstract
The neodymium (Nd) solubility in BaCuO solvent with a Ba to Cu ratio of 3 to 5 was investigated under different oxygen partial pressures ( P(O 2) = 1, 21, 100%). A small amount of the solution was taken out by dipping thermally equilibrated MgO single crystals, and compositions of these specimens stuck with liquid on the MgO, were analyzed by inductively coupled plasma spectrometry (ICP). Sampling the solution for ICP analysis was performed in the temperature range from approximately 1000°C up to 1200°C. The peritectic temperature of NdBa 2Cu 3O 7− δ (Nd123) increased with increasing oxygen partial pressure. The Nd solubility at the peritectic temmperature of Nd123 increased with increasing oxygen partial pressure. The slope of the Nd 123 liquidus lines near the peritectic temperature decreased with increasing oxygen partial pressure. Assuming a regular solution, expressions for the solubility and the enthalpy of dissolution of Nd123 and Nd 4Ba 2Cu 2O 10 (Nd422) were derived from classical thermodynamic calculations. The enthalpies of dissolution ΔH diss for Nd123 and Nd422 decreased with increasing oxygen partial pressure.
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