Thermodynamic and pseudo binary phase diagram of REBa2Cu3O7-x – "Ba2Cu5O7" systems (RE=Nd, Sm, Eu). The effect of oxygen pressure

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In this work the effect of oxygen pressure on the primary crystallisation fields for REBa2Cu3O7–x (RE=Nd, Sm, and Eu) has been studied. A DTA apparatus has been modified in order to carry out analyses under gas pressure, so the trend of temperatures of peritectic decomposition of the REBa2Cu3O7–x phases and of the eutectic equilibrium involving REBa2Cu3O7–x phases and flux mixture 'Ba2Cu5O7' have been studied at oxygen pressures of 0.21, 1, and 10 atm. This showed that primary crystallisation fields spread at the increase of the oxygen pressure and allowed us to calculate the enthalpies of reactions of REBa2Cu3O7–x phases too.

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