On the determination of partial structure functions in small-angle scattering exemplified by Al89Ni6La5alloy

Hoell, Armin; Tatchev, Dragomir; Haas, Sylvio; Haug, J.; Boesecke, Peter

doi:10.1107/s0021889808042453

Cited by 20 publications

(25 citation statements)

References 15 publications

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“…The form of equation 2implies that scattering measurements must be performed on at least three different energies near but below the absorption edge of the resonant element, and this allows the separation of the resonant scattering term, I R (q). This resonant scattering term contains information about the spatial distribution of the resonant chemical element distributed in nanosized structures only (Hoell et al, 2009). The scattering intensity for non-interacting particles with a number distribution N(r) can be calculated by the following expression:…”

Section: Theorymentioning

confidence: 99%

ASAXS study of CaF₂nanoparticles embedded in a silicate glass matrix

Hoell¹,

Varga²,

Raghuwanshi³

et al. 2014

J Appl Cryst

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Author(s) of this paper may load this reprint on their own web site or institutional repository provided that this cover page is retained. Republication of this article or its storage in electronic databases other than as specified above is not permitted without prior permission in writing from the IUCr.For further information see http://journals.iucr.org/services/authorrights.html Many research topics in condensed matter research, materials science and the life sciences make use of crystallographic methods to study crystalline and non-crystalline matter with neutrons, X-rays and electrons. Articles published in the Journal of Applied Crystallography focus on these methods and their use in identifying structural and diffusioncontrolled phase transformations, structure-property relationships, structural changes of defects, interfaces and surfaces, etc. Developments of instrumentation and crystallographic apparatus, theory and interpretation, numerical analysis and other related subjects are also covered. The journal is the primary place where crystallographic computer program information is published.Crystallography Journals Online is available from journals.iucr.org J. Appl. Cryst. (2014 The formation and growth of nanosized CaF 2 crystallites by heat treatment of an oxyfluoride glass of composition 7.65Na 2 O-7.69K 2 O-10.58CaO-12.5CaF 2 -5.77Al 2 O 3 -55.8SiO 2 (wt%) was investigated using anomalous small-angle X-ray scattering (ASAXS). A recently developed vacuum version of the hybrid pixel detector Pilatus 1M was used for the ASAXS measurements below the Ca K-edge of 4038 eV down to 3800 eV. ASAXS investigation allows the determination of structural parameters such as size and size distribution of nanoparticles and characterizes the spatial distribution of the resonant element, Ca. The method reveals quantitatively that the growing CaF 2 crystallites are surrounded by a shell of lower electron density. This depletion shell of growing thickness hinders and finally limits the growth of CaF 2 crystallites. Moreover, in samples that were annealed for 10 h and more, additional very small heterogeneities (1.6 nm diameter) were found.

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Section: Theorymentioning

confidence: 99%

ASAXS study of CaF₂nanoparticles embedded in a silicate glass matrix

Hoell¹,

Varga²,

Raghuwanshi³

et al. 2014

J Appl Cryst

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“…The values of the scattering factors were calculated by the procedure described by Cromer & Liberman (1970). In ASAXS, the contribution of a particular element (resonant atoms) to the scattering intensity is separated from the total scattering intensity by calculating the resonant curve using the Stuhrmann equation (Stuhrmann, 1985;Hoell et al, 2009):…”

Section: Theory Of Resonant Small-angle Scatteringmentioning

confidence: 99%

Structural analysis of magnetic nanocrystals embedded in silicate glasses by anomalous small-angle X-ray scattering

et al. 2012

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The present work reports the structural analysis of magnetic nanocrystals of Feand Mn-containing phases formed during annealing of the glass 13.6Na 2 O-62.9SiO 2 -8.5MnO-15.0Fe 2 O 3Àx (mol%) at 823 K for different periods of time. X-ray diffraction investigation shows the formation of a mixture of MnFe 2 O 4 and Fe 3 O 4 phases. Furthermore, small-angle X-ray scattering and anomalous small-angle X-ray scattering (ASAXS) experiments were used to extract quantitative information about the structure of the formed nano-sized crystals, as well as their phase compositions, volume fractions and size distributions. ASAXS analysis reveals the formation of spherical core-shell particles with the size of the particles between 10 and 50 nm. The concentrations of iron atoms in the core are higher than those in the shell and in the remaining matrix. With increasing annealing time, the ratio of Mn to Fe increases in the nanoparticles and the crystalline phase moves toward the pure jacobsite phase. Evaluated compositions reveal the presence of SiO 2 in the shell. This shell acts as a diffusion barrier for the nanocrystal-forming ions, and the growth of the particles is kinetically constrained. J. Appl. Cryst. (2012). 45, 644-651 Vikram Singh Raghuwanshi et al. Magnetic nanocrystals in silicate glasses 645

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“…Contribution of a particular element (resonant atoms) to the scattering intensity can be separated from the total scattering amplitude by evaluating the resonant curve using the Stuhrmann equation [25,26] …”

Section: Sas/asaxsmentioning

confidence: 99%

Structural analysis of Fe–Mn–O nanoparticles in glass ceramics by small angle scattering

Raghuwanshi

Harizanova

Tatchev

et al. 2015

Journal of Solid State Chemistry

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Magnetic nanocrystals containing Fe and Mn were obtained by annealing of silicate glasses with the composition 13.6Na 2 O-62.9SiO 2 -8.5MnO-15.0Fe 2 O 3-x (mol %) at 580 °C for different periods of time. Here, we present Small Angle Neutron Scattering using Polarized neutrons (SANSPOL) and Anomalous Small Angle X-ray Scattering (ASAXS) investigation on these glass ceramic samples. Analysis of scattering data from both methods reveals the formation of spherical core-shell type of nanoparticles with mean sizes between 10 nm and 100 nm. ASAXS investigation shows the particles have higher concentration of iron atoms and the shell like region surrounding the particles is enriched in SiO 2 . SANSPOL investigation shows the particles are found to be magnetic and are surrounded by a nonmagnetic shell-like region.

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On the determination of partial structure functions in small-angle scattering exemplified by Al₈₉Ni₆La₅alloy

Cited by 20 publications

References 15 publications

ASAXS study of CaF₂nanoparticles embedded in a silicate glass matrix

ASAXS study of CaF₂nanoparticles embedded in a silicate glass matrix

Structural analysis of magnetic nanocrystals embedded in silicate glasses by anomalous small-angle X-ray scattering

Structural analysis of Fe–Mn–O nanoparticles in glass ceramics by small angle scattering

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On the determination of partial structure functions in small-angle scattering exemplified by Al89Ni6La5alloy

Cited by 20 publications

References 15 publications

ASAXS study of CaF2nanoparticles embedded in a silicate glass matrix

ASAXS study of CaF2nanoparticles embedded in a silicate glass matrix

Structural analysis of magnetic nanocrystals embedded in silicate glasses by anomalous small-angle X-ray scattering

Structural analysis of Fe–Mn–O nanoparticles in glass ceramics by small angle scattering

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On the determination of partial structure functions in small-angle scattering exemplified by Al₈₉Ni₆La₅alloy

ASAXS study of CaF₂nanoparticles embedded in a silicate glass matrix

ASAXS study of CaF₂nanoparticles embedded in a silicate glass matrix