New cuprates with the 1222 structure: (Ce,M)Sr-2(Gd,Ce)(2)Cu2Oy (M=Zn,Ni)

作者：Luo HM; Chen ZY; Li RK

来源：Physica C-Superconductivity and Its Applications, 1996, 270(1-2): 167-172.

A new type of layered cuprate with the nominal composition (Ce(0.5)M(0.5))Sr-2(Gd2-xCex)Cu2Oy (M = Zn, Ni) has been successfully synthesized and identified by X-ray diffraction analysis. The compounds have a tetragonal cell with the space group of I4/mmm. The lattice parameters of a = 3.8365(1) Angstrom, c = 29.2010(4) Angstrom for (Ce0.5Zn0.5)Sr-2(Gd1.2Ce0.8)Cu2Oy and a = 3.8389(5) Angstrom, c = 29.0548(10) Angstrom for the Ni analog were obtained from indexing the XRD patterns. By using the Rietveld refinement, the compounds were found possessing the same structure type as the common 1222 structure. Although complete CuO pyramidal planes also exist in the present compounds, the as-prepared samples are not superconducting above 15 K.

• 出版日期1996-10-10
• 单位中国科学技术大学