Abstract
The synthesis of YBa 2Cu 3O 7 − x from Y 2O 3, BaO 2 and CuO has been studied in the temperature range 330−930°C in order to identify the intermediate phases which appear prior to the formation of the Y-123 compound. The first reaction between BaO 2 and CuO in the mixture begins at ≈ 330°C. Barium cuprates of composition BaCuO 2 + x (0 ⩽ x ⩽ 0.5) are formed, with BaCuO 2 as the most stable phase. BaO 2 is mainly consumed in these reactions up to ≈ 750°C. Barium cuprates and Y 2O 3 react finally above 750°C, giving YBa 2Cu 3O 7 − x.
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