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Phase diagram of the BaO-½Y2O3-CuOx system prepared at pO2 = 21 kPa (875 °C to 900 °C). In this diagram, the symbols (2:1:3), (4:1:3), (6:1:3), and (1:2:1) are used to represent the phases BaY2CuO5, Ba4YCu3Ox, Ba6YCu3Ox, and BaY2CuO5, respectively [94].
