Showing papers by "Zhifeng Ren published in 1989"
TL;DR: In this article, a new 2201 phase containing Pb and Ca with orthorhombic symmetry in nominal (Bi0.90 Pb0.10 )2 Sr2 CaCu2 O8 crystals was found, and its structure with space group Bbmb and two-dimensional modulation are analogous to those of the Pb-doped higher members of the structural series Bi2 Sr 2 Can−1 Cun O2n+4.
Abstract: Bi‐based superconducting phases have been studied by transmission electron microscopy. The strong one‐dimensional modulations in undoped and Ce‐doped monoclinic Bi2 Sr2 CuO6 (2201) samples are different from one another. We have found a new 2201 phase containing Pb and Ca with orthorhombic symmetry in nominal (Bi0.90 Pb0.10 )2 Sr2 CaCu2 O8 crystals. Its structure with space group Bbmb and two‐dimensional modulation are analogous to those of the Pb‐doped higher members of the structural series Bi2 Sr2 Can−1 Cun O2n+4 . Hence, this new orthorhombic rather than the monoclinic 2201 phase should be the first member of the structural series.
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