X-ray scattering from amorphous solids

Feng, Ruixing; Stachurski, Zbigniew; Rodríguez, Matías; Kluth, Patrick; Araujo, Leandro; Bulla, Douglas; Ridgway, Mark C

doi:10.1016/j.jnoncrysol.2013.04.070

Cited by 13 publications

(13 citation statements)

References 24 publications

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“…More straightforward interpretation of compositional variations in the XRPD patterns of As‐Se glasses can be developed within modified microcrystalline approach , accepting their diffuse halos as superposition of broadened Bragg‐diffraction reflexes from remnants of microcrystalline inter‐planar correlations R , supplemented by diffuse halos from prominent pair inter‐atomic correlations d s , ie diffuse halos originated from coordination spheres obeying the Ehrenfest relation (). The latter is known to be a useful approach to treat the XRPD patterns of ideal amorphous solids , which can be characterized by structures composed of randomly positioned hard contacting spheres, obeying ideal dense‐random‐packing (DRP) arrangement …”

Section: Resultsmentioning

confidence: 99%

“…In a glassy state, the Ehrenfest diffraction from inter‐atomic correlations is merely hidden as compared with Bragg diffraction from inter‐planar (inter‐layer) correlations . Nevertheless, it can be reasonably accepted that XRPD patterns are essentially disturbed in covalent‐bonded network As‐Se glasses by superposition from the Ehrenfest‐diffraction reflexes.…”

Section: Resultsmentioning

confidence: 99%

“…We also explore the concept of diffuse halos in the XRPD patterns of amorphous substances as arising from coordination spheres, ie the closest inter‐atomic distances like in randomly packed multiparticulate systems, when XRPD patterns are governed by the Ehrenfest relation:

2 d_{normals} \cdot \sin θ = 1.23 \cdot λ,

where d s is average inter‐atomic distance in a glass structure (ie distance between atomic scattering centers defined as radius of the corresponding coordination sphere).…”

Section: Methodsmentioning

confidence: 99%

“…coordination spheres, ie the closest inter-atomic distances like in randomly packed multiparticulate systems, [32][33][34][35] when XRPD patterns are governed by the Ehrenfest relation 36 :…”

Section: Methodsmentioning

confidence: 99%

“…In this work, we first report the results of high-energy MM effect on medium-range structural ordering in glassy arsenoselenides As x Se 100 − x obtained from the glass-forming region of this canonical system, 9,10 including preliminary studied under-stoichiometric glasses restricted by stoichiometric As 2 Se 3 (ie As 40 Se 60 ) and Se-rich As 5 Se 95 specimens, 11 and stretching far towards over-stoichiometric glassy As 65 Se 35 and mixed crystalline-amorphous As 70 Se 30 and As 75 Se 25 alloys.…”

Section: Introductionmentioning

confidence: 99%

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Effect of high‐energy mechanical milling on the medium‐range ordering in glassy As‐Se

et al. 2019

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Effect of high‐energy mechanical milling on glassy AsxSe100 − x (5 ≤ x ≤ 75) is recognized with X‐ray powder diffraction analysis applied to their diffuse halos ascribed to intermediate—and extended‐range structural ordering, which are revealed respectively in the first sharp diffraction peak (FSDP) and principal diffraction peak (PDP). Straightforward interpretation of the results is developed within modified microcrystalline approach, treating diffuse halos as superposition of broadened Bragg‐diffraction reflexes from remnants of inter‐planar correlations, supplemented by inter‐atomic Ehrenfest‐diffraction reflexes from most prominent inter‐atomic and inter‐molecular correlations between cage‐like molecules (such As4Se4 and/or As4Se3). Milling is shown to be ineffective in glassy arsenoselenides near Se (x < 20), while causing increase in the FSDP width for glasses with 20 ≤ x ≤ 40 due to destroyed inter‐planar ordering. Remnants of cage‐like molecules in over‐stoichiometric As‐rich AsxSe100 − x glasses (40 ≤ x ≤ 75) disappear under milling, promoting formation of higher polymerized structural network. This milling‐driven reamorphization results in a drastic increase in the FSDP position and fragmentation impact on the correlation length of the FSDP‐responsible entities. Breakdown in intermediate‐range ordering in these glasses is accompanied by changes in their extended‐range ordering revealed in high‐angular shift and broadening of the PDP. This effect is concomitant with the disappearance of distant inter‐atomic correlations between quasi‐crystalline planes in the milled arsenoselenide glasses at a cost of prolonged correlations dominating in their extended‐range ordering.

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Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

2 d_{normals} \cdot \sin θ = 1.23 \cdot λ,

where d s is average inter‐atomic distance in a glass structure (ie distance between atomic scattering centers defined as radius of the corresponding coordination sphere).…”