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- W2062172114 abstract "The modulated structure of ${mathrm{Bi}}_{2.1mathrm{ensuremath{-}}mathrm{y}}$${mathrm{Pb}}_{mathrm{y}}$${mathrm{Sr}}_{1.9mathrm{ensuremath{-}}mathrm{x}}$${mathrm{La}}_{mathrm{x}}$${mathrm{CuO}}_{mathrm{z}}$ (y=0.2,n0.4;n0.1ensuremath{leqslant}xensuremath{leqslant}1.0) was studied by means of electron diffraction. The experimental data show that the modulated structure changes from a mixed Bi/Pb-type to a pure Bi-type modulation with an increasing amount of La content in both the y=0.2 and 0.4 series and that the periodicity of the Bi-type modulation decreases correspondingly. When x=1.0, the modulation exhibits nearly the same characteristic in the samples with y=0.2 and 0.4. In addition, the extra-oxygen behavior, together with the local-structural distortion characteristic, related to the change of the modulated structure was also examined with Raman scattering, x-ray photoelectron spectroscopy and high-resolution electron micro- graphy. The experiment results reveal that there are more extra-oxygen atoms intercalating in the ${mathrm{Bi}}_{2}$${mathrm{O}}_{2}$ layers with a decrease in the modulation periodicity in the y=0.2 series. However, for the y=0.4 series, no more extra oxygen is incorporated into the ${mathrm{Bi}}_{2}$${mathrm{O}}_{2}$ layers with a decrease in the modulation periodicity, but the degree of local-structural distortion strengthens markedly in the ${mathrm{Bi}}_{2}$${mathrm{O}}_{2}$ layers. Based on these experiment results, we discuss the relationship of the superstructure modulation, extra oxygen, and the local-structural distortion." @default.
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- W2062172114 date "1997-04-01" @default.
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- W2062172114 title "Relation of the superstructure modulation and extra-oxygen local-structural distortion in<mml:math xmlns:mml=http://www.w3.org/1998/Math/MathML display=inline><mml:mrow><mml:msub><mml:mrow><mml:mi mathvariant=normal>Bi</mml:mi></mml:mrow><mml:mrow><mml:mn>2.1</mml:mn><mml:mi mathvariant=normal>−</mml:mi><mml:mi mathvariant=normal>y</mml:mi></mml:mrow></mml:msub></mml:mrow></mml:math><mml:math xmlns:mml=http://www.w3.org/1998/Math/MathML display=inline><mml:mrow><mml:msub><mml:mrow…" @default.
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- W2062172114 doi "https://doi.org/10.1103/physrevb.55.9130" @default.
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