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1
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Extended X-Ray Absorption Fine Structure Evidence for Homopolar Bonding in Amorphous Cd-As and Zn-P

100%
Burian A.
Acta Physica Polonica A
|
1992
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vol. 82
|
issue 2
309-313
EN
Local atomic arrangement in evaporated amorphous Cd-As and Zn-P films was investigated by extended X-ray absorption fine structure. Results of modelling indicate that bonds between atoms of the same kind occur for both (Cd,Zn)-rich and (As,P)-rich compositional regions. This specific chemical ordering, much alike to that in the corresponding crystalline polymorphs, appears to play a predominant role in determining of the local structures in these materials.
2
Content available remote

Structure Refinement of Amorphous Cd-As by Analysis of Partial Radial Distribution Functions

100%
Burian A.
|
EN
The anomalous wide angle X-ray scattering technique was used to determine the partial structure factors and then the partial radial distribution functions for vacuum evaporated Cd-As amorphous films containing 41 and 74% at. As. The experiments were performed using synchrotron radiation tuned near the As and Cd absorption edges. The obtained structural information about the individual Cd-Cd, Cd-As and As-As correlations shows that As and Cd remain almost tetrahedrally coordinated and suggest a certain degree of chemical disorder of the investigated samples.
3
Content available remote

Does Carbon Prefer Flat or Curved Surfaces?

64%
Burian A., Dore J. C.
Acta Physica Polonica A
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2000
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vol. 98
|
issue 5
457-468
EN
The presence of fullerene- and nanotube-like elements in carbons prepared from saccharose and anthracene by slow pyrolysis and then heat treated at 1000°C, 1900°C, and 2300°C has been revealed using Raman spectroscopy. High energy X-ray diffraction has been used to examine the effect on these carbons of heat treatment. Tendency to graphitization of the anthracene-based carbon and resistance to graphitization of the saccharose carbon will be considered in the light of the formation of curved graphitic networks and cages. The obtained results lead us to propose a model of the structure of non-graphitizing and graphitizing carbons.
4
Content available remote

Structural Studies of Carbon Nanotubes and Related Materials by Neutron and X-Ray Diffraction

51%
Dore J., Burian A., Tomita S.
Acta Physica Polonica A
|
2000
|
vol. 98
|
issue 5
495-504
EN
X-ray and neutron diffraction measurements are presented for a number of carbon samples prepared by different techniques. The information obtained from diffraction studies is presented in relation to other types of investigation, particularly in relation to electron microscopy. The characteristics of the graphene sheets are discussed in relation to these features.
5
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Content available

GEOPOL®. The Innovated Environment Friendly Inorganic Binder System

51%
Vykoukal M., Burian A., Přerovská M.
Archives of Foundry Engineering
|
2019
|
vol. 19
|
issue 1
6
Publication available in full text mode
Content available

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

46%
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
EN
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.
7
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Gas Evolution of GEOPOL® W Sand Mixture and Comparison with Organic Binders

45%
Vykoukal M., Burian A., Přerovská M., Bajer T., Beňo J.
Archives of Foundry Engineering
|
2019
|
vol. 19
|
issue 2
8
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Content available

Curved Surfaces in Disordered Carbons by High Energy X-ray Scattering

39%
Burian A., Szczygielska A., Kołoczek J., Dore J., Honkimaki V., Duber S.
Acta Physica Polonica A
|
2002
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vol. 101
|
issue 5
751-759
EN
Disordered carbons prepared by slow pyrolysis of saccharose and anthracene and subsequent heat treatment at 1000ºC and 2300ºC have been studied by high energy X-ray diffraction. Computer simulations of the powder diffraction patterns of fullerenes, nanotubes and carbon models have been compared with the experimental data after conversion to real space via the Fourier transform. The presence of fullerene- and nanotube-like fragments with non-six membered rings in the investigated samples has been deduced by detailed analysis of the radial distribution functions of the saccharose- and anthracene-based carbons and related to resistance to graphitization of the saccharose-based carbons and to stability of the growing crystallites in the case of the anthracene-based carbons. The obtained results are compared to high resolution electron microscopy and Raman studies.
9
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Interpretation of Differential Anomalous X-Ray Scattering Data for Amorphous Cd-As

39%
Burian A., Lecante P., Mosset A., Galy J., Tonnerre J. M., Raoux D.
Acta Physica Polonica A
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1994
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vol. 86
|
issue 4
633-640
EN
The computational procedure, based on Warren's exact method for an amorphous sample with more than one atom, was developed to obtain the short-range order structural parameters from the differential anomalous X-ray scattering data, collected using the synchrotron radiation. The experimental differential radial distribution functions were fitted with the true distribution functions expressed in an analytical form and broadened by convolution with the pair functions. It was found that atoms in the amorphous Cd-As films remain almost tetrahedrally coordinated and the investigated alloys are chemically ordered.
10
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Laboratory Dispersive EXAFS Spectrometer

39%
Mosset A., Lecante P., Baules P., Jaud J., Galy J., Burian A.
Acta Physica Polonica A
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1997
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vol. 91
|
issue 4
825-828
EN
We report on a laboratory EXAFS spectrometer optimized for transmission dispersive mode. Absorption edges ranging from 6 to 20keV can be studied. Factors determining energy range and resolution are detailed. A new asymmetric geometry which allows to use all the lattice planes of the dispersing crystal is described and the choice of the best plane analysed. EXAFS spectra of Cu metal and Cu acetate, obtained on this laboratory facility, are compared to the corresponding spectra recorded on the French synchrotron facility (LURE).
11
Content available remote

Radial Distribution Function Analysis of Carbon Nanotubes

39%
Szczygielska A., Jabłońska A., Burian A., Dore J. C., Honkimaki V., Nagy J. B.
Acta Physica Polonica A
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2000
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vol. 98
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issue 5
611-617
EN
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.
12
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Angular Distribution of N-Doped Carbon Nanotubes in Alumina Membrane Channels: A High-Energy X-ray Diffraction Study

39%
Hawelek L., Brodka A., Dore J., Honkimäki V., Kyotani T., Yang Q., Burian A.
|
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issue 2
302-306
EN
An alignment study of multi-wall N-doped carbon nanotubes prepared by a template pyrolytic carbon deposition method inside channels of an alumina membrane has been performed using high-energy X-ray diffraction on the ID15B beamline at the European Synchrotron Radiation Facility (ESRF, Grenoble). The two-dimensional diffraction pattern of the deposited carbon nanotubes, recorded directly, within the alumina membrane, using an image plate detector, exhibits two non-continuous arcs corresponding to the 002 graphitic reflection. The following values of the angle between the axis of the carbon nanotubes lying along the membrane channels and the incident beam were taken for five positions: 0°, 30°, 45°, 60° and 90°. The anisotropic scattering distribution of the two-dimensional patterns indicates an orientational alignment of the nanotubes. The one-dimensional intensity patterns obtained by scanning around the circumference of the (0 0 2) ring have allowed an estimation of the angular distribution of the nanotubes axes.
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