Crystal structure of (Pb1-xMx)Sr-2(Y1-yCay)Cu2Oz and its physical properties

For exploring novel Pb-contained 1212 compounds, we examined the condition for preparing the (Pb2/3M1/3)-1212 phase and the kind of elements substitut ed for the Pb site. It was revealed that when the M element is divalent or trivalent, single ph ase (Pb2/3M1/3)-1212 was formed, indicating that charge balance is an impor tant factor for forming the (Pb2/3M1/3)-1212 phase. Moreover, quenching tre atment was proven to be indispensable for forming a single phase of the (Pb 2/3M1/3)-1212 compound (M = Ag, Cu, Fe, Ga, In, and Ni). We also investigated the physical properties of (Pb2/3Ag1/3)-1212 phase and confirmed its non-superconductivity.