Module 1: Structure of Ceramics
  Orthogonal Structures
 


       1.9.2 Lanthanum Strontium Copper Oxide La2-xSrxCuO4

  • Parent compound La2CuO4 is actually a mixture of one Rocksalt structured compound, LaO and one perovskite structured compound, LaCuO3 and can also be written as LaO.LaCuO3.

  • The structure shows a layered structure with layers stacked as A4O-AO4-A4O as shown below where A is La.

  • Substitution of La by Sr results in the compound La2-x Srx CuO4 turning into a superconductor with a Tc  ~ 35K.

Figure 1.37 (a) Origin of La2-xSrxCuO4 structure, shown in (b) as two perovskite and cells