(Nd, Sr)2(Nd, Ce)2 Cu2O&(T* Phase (Nd, Ce)2 CuO(T' Phase) DErivated from K NiF lose one vertex and thus forr lose two vertexes and thus Nd, Sr), (Nd, Ce),Cu,O be regarded as the altemate form CuO, plan HNd ce)CuO, can be layer and rocksalt layer alor fluorite structure unit along C axIs STe28K Cd NE c axis. STe=24K TIBa2 Ca, Cu, O2n+3 Supercon uctors Pb, Sr2- La Cu,O (Pb2202) *Can be regarded as special w with singer gle TIO layer ee Te is 50K, 103K and e8> om La CuO4, in which one CuOe 117K, respectively OoOoO Po form liner coordination structure hey are built up by two kinds of clone Rocksalt layers and in octahedron coordination S, Lao structure (+2 valence)and the Perovskite lavers Comparison of Pb2202 and La CuOA La CaCu,O6 sThis structure contains two 488能m ②的 face-to-face CuO square pyramid Ouo lavers. It esult of two-fold ygen-deficient perovskite 000Oo ONO L structure from two layers of Cuo CO octahedron losing the common eee C vertex oxygture can also be CaAt (Sr, La)o (La, St)0 A9 ON 5. ws hiph abed by glwp eaves ate geer Pb, (Sr, La),Cu, Oe (La, Sr), CuO e eee ca deficient perovskite. (T phase)10 (Nd,Sr)2 (Nd,Ce)2Cu2O8 (T* Phase) Derivated from K2NiF4 structure. CuO6 octahedron lose one vertex and thus form CuO5 square pyramids. (Nd,Sr)2 (Nd,Ce)2Cu2O8 can be regarded as the alternate stacking of CuO5 square pyramids layers, fluorite layer and rocksalt layer along c axis. Tc=28K (Nd,Ce)2CuO4 (T’Phase) Derivated from K2NiF4 structure. CuO6 octahedron lose two vertexes and thus form CuO4 plane. (Nd,Ce)2CuO4 can be regarded as the alternate stacking of CuO4 plane and fluorite structure unit along c axis. Tc=24K TlBa2Can-1CunO2n+3 Superconductors TlBa2Can-1CunO2n+3 (n=1,2,3… ) series with single TlO layer, Tc is 50K，103K and 117K，respectively. They are built up by Rocksalt layers and oxygen-deficient Perovskite layers. Ba Pb2Sr2-xLaxCu2O6 (Pb2202) Can be regarded as special K2NiF4 structure, and derivated from La2CuO4 ,in which one CuO6 octahedron loss all oxygens and form liner coordination structure. There are two kinds of Cu,one in octahedron coordination structure (+2 valence)and the other in linear coordination structure (+1 valence). Tc=32K Comparison of Pb2202 and La2CuO4 Pb2 (Sr,La)2Cu2O6 (La,Sr)2CuO4 (T phase) La2CaCu2O6 This structure contains two face-to-face CuO5 square pyramid layers. It is a result of two-fold oxygen-deficient perovskite structure from two layers of CuO6 octahedron losing the common vertex oxygen. This structure can also be regarded as the derivative in which the single perovskite layer is replaced by two layers oxygen￾deficient perovskite