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Radial Distribution Function Analysis of Carbon Nanotubes

100%

Szczygielska A., Jabłońska A., Burian A., Dore J. C., Honkimaki V., Nagy J. B.

Acta Physica Polonica A

2000

vol. 98

issue 5

611-617

Wide-angle X-ray scattering studies of carbon nanotubes produced by catalytic decomposition of acetylene on a supported Co catalyst are reported. The X-ray intensities were recorded up to maximum scattering vector K_{max}=24Å and then Fourier transformed to real space. Yielding the radial distribution functions of good spatial resolution were analysed by the model based on fitting procedures method. Detailed analysis of the experimental data by a least-squares fitting procedure shows that the local atomic structure exhibits the expected hexagonal network with the nearest-neighbour C-C distance of 1.41Å. Investigation of stacking nature of subsequent layers suggests the structure in which adjacent layers are arranged without spatial correlations with inter-tubule spacing of about 3.4Å.

Application of Third Generation Synchrotron Source to Studies of Non-Crystalline Materials: In-Se Amorphous Films

84%

Burian A., Jabłońska A., Burian A., Le Bolloc'h D., Metzger H., Proux O., Hazemann J., Mosset A., Raoux D.

Acta Physica Polonica A

2002

vol. 101

issue 5

701-708

The local structure of vacuum evaporated In-Se amorphous films, containing 50, 60, and 66 at.% Se, was studied using differential anomalous X-ray scattering and extended X-ray absorption fine structure. Both intensity and absorption spectra were measured in the vicinity of the absorption K-edge of Se. The differential anomalous X-ray scattering data were converted to real space by the inverse Fourier transform yielding the differential radial distribution functions. The obtained results provide evidence for the presence of Se-In spatial correlations for In_{50}Se_{50} and Se-In and Se-Se correlations for In_{40}Se_{60} and In_{34}Se_{66} within the first coordination sphere.

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2 Acta Physica Polonica A

1 2002

1 2000

2 Burian A.

2 Jabłońska A.

1 Dore J. C.

1 Hazemann J.

1 Honkimaki V.

1 Le Bolloc'h D.

1 Metzger H.

1 Mosset A.

1 Nagy J. B.

1 Proux O.

1 Raoux D.

1 Szczygielska A.

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Radial Distribution Function Analysis of Carbon Nanotubes

Application of Third Generation Synchrotron Source to Studies of Non-Crystalline Materials: In-Se Amorphous Films