BA2(CU0.7CD0.3)O3 - A NEW DOUBLE-CENTER PEROVSKITE STRUCTURE

A new phase of Ba2(Cu0.7Cd0.3)O3 has been discovered. The composition of the phase was examined by energy dispersive X-ray spectrometry. The phase exhibits a tetragonal structure with lattice constants a = 4.07 7 angstrom and c = 7.970 angstrom, and its space group is P4/mmm. We p ropose a double-center-perovskite structure model, which is similar to that of (Ba, Sr)2CuO2(CO3) [1,2]. The simulated XRD is close to the o bserved one. The analysis results of elemental analyzer and Fourier tr ansform infrared spectrometer reveal that the phase does not contain C O3(2-). The cuprate is an insulator, but its new cell structure and th e large size of the CuO2 planes seem to suggest a good reason for rese arching new superconductors. The roles of CdO in the solid state react ion and the formation of the new phase are discussed.