Comparison of La, Ca Cu, Oe and La, CuO YBa, Cu3O7-the 123 Superconductor 上4)魔 temperature, T>77K wYBa cuo can be viewed as an Oxygen-Deficient Perovskite ∠A 48峪8 Chains of vertex-linked CuO, 自自台台c squares La Cuo Oxide Superconductor and Perovskite Structure YBa. Cu, O.(Y124 Phase) oooo WY124 phase connects two CuO. C suits o cu o double thain Cuo double chain can be regarde Qm明mp以sm vskites and lossing oxygens At is a 7-fold oxvg ABO, 3 ABO3 Comparison of y124 and Y123 Y,Ba, Cu,O14(Y-247 phase) u-o tructure Can be regarded as the 4n9ON M structure of Y123 phase and Y124 So phase.Its temperature is 40K YBa CuO, Ba Cu, O Y124)11 Comparison of La2CaCu2O6 and La2CuO4 La2CaCu2O6 La2CuO4 (T phase) YBa2Cu3O7 ¾the 123 Superconductor the first material to superconduct at liquid N2 temperature, Tc > 77 K YBa2Cu3O7 can be viewed as an Oxygen-Deficient Perovskite. Two types of Cu site: Layers of CuO5 square pyramids Chains of vertex-linked CuO4 squares Oxide Superconductor and Perovskite Structure ABO3 3 ABO3 Y123 YBa2Cu4O8 (Y124 Phase) Y124 phase connects two CuO5 square pyramids by structure units of Cu-O double chain. Cu-O double chain can be regarded as the common edges of CuO6 octahedron of two layers of perovskites and lossing oxygens in the opposite planes. It is a 7-fold oxygen-deficient perovskite structure (c~7ap ). Its superconducting transition temperature is 80K. Comparison of Y124 and Y123 YBa2Cu4O8 (Y124) YBa2Cu3O7 (Y123) Y2Ba4Cu7O14 (Y-247 phase) Besides oxygen-deficient perovskite layers containing Cu-O plane, Y247 unit also contains Cu￾O double chain and Cu-O linear structure. Can be regarded as the complex structure of Y123 phase and Y124 phase.Its superconducting temperature is 40K