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- W2005875418 abstract "Abstract New Bi-based cuprates with the “1-2-2-2” structure have been synthesized. The tetragonal structure of (Bi,Cu)Sr2LnCeCu2O9−δ (space group I4/mmm) can be derived from that of the recently discovered superconductors (Bi,Cu)Sr2YCu2O7−z, in which Y separates the CuO2 layers responsible for the occurrence of superconductivity. When Y is replaced by fluorite-type blocks, LnCeO2 (with Ln = Y, Sm, Eu, Gd, DyandHo), and the residual upper half of each unit cell is shifted by [ 1 2 1 2 0], the resu (Bi,Cu)Sr2LnCeCu2O9−δ are isostructural to the superconductor (Pb,Cu)(Sr,Eu)2(Eu,Ce)2Cu2O9−δ. The compounds (Bi,Cu)Sr2YCu2O7−z and (Bi,Cu)Sr2LnCeCu2O9−δ with (Bi,Cu)-O monolayers can be considered as sister series analogous t the Bi2Sr2CaCu2O8 and the Bi2Sr2(Ln,Ce)2Cu2O10 compounds, which both contain double Bi-O layers. A quantitative ana of almost-single-phase material for LnHo with respect to cation contents by EDS techniques suggests an approximate stoichiometry Bi0.3Sr1.9Ho1.2Ce0.9Cu2.2O9−δ. When synthesized at ambient pressure, the investigated samples are not superconducting above T = 1.9 K, for any choice of Ln." @default.
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- W2005875418 date "1992-11-01" @default.
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- W2005875418 title "New cuprates with (Bi, Cu)-O monolayers: (Bi,Cu)Sr2LnCeCu2O9−δ" @default.
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- W2005875418 doi "https://doi.org/10.1016/0167-577x(92)90133-5" @default.
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