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A unidirectional reaction for synthesis of the high T_c superconductor YBa_2Cu_3O_x has beenproposed, Its T_c is 90-94.5 K and △T is 1 K. The phase relationships in the systemY_2BaCuO_5-Y_2Cu_2O_5-CuO-YBa_2Cu_3O_x were studied and discussed.
A unidirectional reaction for synthesis of the high T_c superconductor YBa_2Cu_3O_x has beenproposed, Its T_c is 90-94.5 K and ΔT is 1 K. The phase relationships in the system Y_2BaCuO_5-Y_2Cu_2O_5-CuO-YBa_2Cu_3O_x were studied and discussed.