Atomic structure and short- and medium-range order parameters in amorphous chalcogenide films prepared by different methods

Sarsembinov, Sh.Sh.; Prikhodko, O. Yu.; Ryaguzov, A.P.; Maksimova, S. Ya.; Ushanov, V.Zh.

doi:10.1016/j.jnoncrysol.2007.02.043

Cited by 6 publications

(6 citation statements)

References 7 publications

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“…Noteworthy, similar interrelations between the FSDP and PDP were also observed by De Neufville et al in the XRD patterns of as‐deposited As 2 Se 3 films (thickened to 22 μm), affected by thermal annealing below glass‐transition temperature or illuminated by absorbed light. Such changes were also detected by Sarsembinov et al in As 2 Se 3 films (having 4‐12 μm in a thickness) prepared by thermal evaporation in vacuum and ion‐plasma sputtering.…”

Section: Resultssupporting

confidence: 64%

“…The XRPD patterns of unmilled and milled As x Se 100 − x alloys demonstrate few diffuse peaks (“amorphous” halos proper to vitreous arsenic chalcogenides) at ~15‐22, ~28‐33 and ~50‐60 o 2 Θ . In a reciprocal space, these halos can be scaled in respect to Q⋅d s parameter (where d s denotes an averaged nearest‐neighbor inter‐atomic distance), positioned at ~2‐3, ~4.6‐4.9, and ~7.7‐8.9 . According to Fourier‐transform analysis, each of these features corresponds to real‐space ordering with effective periodicity R and correlation length L determined by Equations () and (), respectively.…”

Section: Resultsmentioning

confidence: 99%

“…The characteristic distance R (spacing of the FSDP‐responsible quasi‐periodicity) and correlation length L (over which this quasi‐periodicity was maintained) were defined as:

R = 2 π / Q,

L = 2 π / Δ Q .

…”

Section: Methodsmentioning

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: Resultssupporting

confidence: 64%

Section: Resultsmentioning

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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“…The characteristic distance R (viz. the spacing of "quasi-periodicity" responsible for the FSDP, accepted this peak as a signature of remnants of crystallographic inter-planar periodicity) and correlation length L over which this "quasi-periodicity" is maintained were calculated as [24][25][26][27][28][29][30][31][32][33]:…”

Section: Accepted Manuscriptmentioning

confidence: 99%

“…demonstrates the XRPD profiles for unmilled and milled g-As 40 Se 60 in comparison with theoretical Bragg diffraction reflexes for monoclinic As 2 Se 3 and trigonal Se[21,22]. As stated above, the XRPD patterns of such substances contain a few spatially-separated diffuse halos at ∼50-60, ∼28-32 and ∼15-22 o 2θ, where third one is referred to as the FSDP[25][26][27][28][29][30][31][32][33]. With the Ehrenfest eq.…”

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confidence: 92%

Effect of high-energy mechanical milling on the FSDP-related XRPD correlations in Se-rich glassy arsenic selenides

Shpotyuk

Boussard‐Plédel

Bureau

et al. 2019

Journal of Physics and Chemistry of Solids

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The X-ray powder diffraction (XRPD) patterns related to the first sharp diffraction peak (FSDP) are registered for Se-rich As x Se 100-x glasses (5≤x≤40), subjected to high-energy mechanical milling in a dry mode with 500 min-1 rotational speed. The results are treated in terms of structural model assuming broad diffraction halos in the XRPD patterns appeared due to remnants of inter-planar "quasi-crystalline" correlations, disturbed by overlapping with diffuse halos originated from strongest inter-atomic correlations, in part, the nearest-neighbor correlations between cation-like atoms. Milling does not influence the FSDP in a vicinity of glassy Se (x<20), while causes increase in the FSDP width ∆Q (the reduced correlation length L) in the glasses with 20≤x<40, these changes being ascribed to disturbed inter-planar arrangement in covalent-bonded network due to structural defects generated under attrition ball milling. Assuming contribution of the Ehrenfest diffraction from coordination spheres in the detected XRPD patterns, the latter is ascribed to broadening in the distribution of characteristic FSDP-related inter-atomic distances, thus testifying in a favor of more defective structure of milled glass.

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Photoinduced effects in AsSP glasses

Santagneli

Messaddeq

Ribeiro

et al. 2009

Physica Status Solidi (b)

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We report the photoinduced effects on the glass composition As2S3 and As29.6P7.4S63 when exposed to UV light. The morphology of the glass surface irradiated at different power densities was investigated by use of optical microscopy and scanning electron microscopy (SEM). A power density dependence on the photoexpansion (PE) and photoablation (PA) is observed. Raman measurement after irradiation shows the formation of AsO bonds in As29.6P7.4S63. Also, the appearance of PO bonds indicate the incorporation of oxygen at the glass surface during the irradiation process.

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Atomic structure and short- and medium-range order parameters in amorphous chalcogenide films prepared by different methods

Cited by 6 publications

References 7 publications

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

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

Effect of high-energy mechanical milling on the FSDP-related XRPD correlations in Se-rich glassy arsenic selenides

Photoinduced effects in AsSP glasses

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