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- W1981412990 abstract "A new layered copper oxide BaNdCe0.9Fe1.1Cu0.9O7−δ has been isolated. Its tetragonal structure (a = 3.902 Å, c = 20.895 Å) has been studied by X-ray powder diffraction and HREM. This oxide can be described as an intergrowth of the NdBaFeCuO5 structure (isostructural with YBaFeCuO5) and the CeO2 fluorite structure. Thus it belongs to a series of oxides, characterized by double fluorite layers, resulting from the introduction of one additional [CeO2]∞ fluorite layer in mother structures involving double pyramidal copper layers [A2Cu2O5]∞. The systematic HREM study of samples of nominal compositions “BaNdCe0.9Fe1.1Cu0.9O7” and “BaNdCeFeCuO7” shows, besides regular crystals, extended intergrowth defects, i.e., mainly single fluorite-layered defects leading to intergrowths [NdBaFeCuO5]m [Ln2BaFeCuO7]n, triple fluorite-layered defects leading to possible intergrowths [Ln3BaFeCuO9]m [Ln2BaFeCeO7]n, and triple perovskite-layered defects suggesting the existence of possible intergrowths [Ba2Ln2 (Fe,Cu)3O9+δ]m [Ln2BaFeCuO7]n. More complex intergrowth defects (multiple fluorite and perovskite layers, superdislocations) are also observed. These observations suggest that the systematic investigation of similar systems should allow complex disordered and ordered intergrowths [A2Cu2O5]ph[ACuO3−x]pi[LnO2]Fj[A′O]RSk to be isolated." @default.
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- W1981412990 date "1991-06-01" @default.
- W1981412990 modified "2023-09-23" @default.
- W1981412990 title "BaNdCe0.9Fe1+xCu1−xO7−δ: An intergrowth of the BaYFeCuO5 type and CeO2 fluorite type structures" @default.
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- W1981412990 doi "https://doi.org/10.1016/0022-4596(91)90342-f" @default.
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