Intermediate range order in alkaline borate glasses

Crupi, C.; Carini, G.; Ruello, Giovanna; D’Angelo, Giovanna

doi:10.1080/14786435.2015.1122247

Cited by 9 publications

(15 citation statements)

References 32 publications

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“…In general opinion, the FSDP is accepted as a direct manifestation of intermediate-range ordering in a glass, 14 despite a lot of controversies concerning microstructural origin of this diffuse peak-halo in XRPD patterns of many glasses. 39,40 Chronologically, one of the first was the microcrystalline model alternatively termed as the distorted-layer (molecular) model, originally proposed by Vaipolin and Porai-Koshits yet in the earliest 1960s, 41 who treated diffuse halos (incl. the FSDP) in glasses due to remnants of distorted (quasi-crystalline) structures proper to their crystalline counterparts.…”

Section: Microcrystallinity Impact On Mmderived Medium-range Orderimentioning

confidence: 99%

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: Microcrystallinity Impact On Mmderived Medium-range Orderimentioning

confidence: 99%

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

et al. 2019

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“…A recent study [68] stressed that interstitial (empty and/or filled) voids, having different sizes, can provide a general explanation for all anomalous behaviors revealed for the FSDP.…”

Section: Discussionmentioning

confidence: 99%

“…On the other hand, a recent study of a series of alkaline borate glasses at different metal oxide content using neutron diffraction has found strong differences in the intermediate range order as a function of the specific alkaline ion and of its concentration. In that study, Crupi et al [68] concluded that the FSDP arises from correlations of atoms of voids and showed that the compositional variation of this peak intensity in alkaline borate glasses is due to changes in the distribution of void sizes within the three-dimensional network.…”

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confidence: 99%

The First Sharp Diffraction Peak in the Total Structure Function of Amorphous Chalcogenide Glasses: Anomalous Characteristics and Controversial Views

Shatnawi¹

2016

NJGC

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Anomalous structural characteristics of the so-called first sharp diffraction peak (FSDP) that arises in the total static structure functions of network-forming glasses and liquids at around 1 2 − Å −1 have been reviewed and discussed in details. Unlike other peaks in the static structure functions, the FSDP has anomalous dependencies on temperature, pressure and composition. Despite the fact that the FSDP is considered as a signature of intermediate range order (IRO) in network-forming glasses and liquids, its structural origin remains unclear and till now, it forms a subject of debate. A brief account for some anomalous characteristics of the FSDP followed by the different controversial interpretations about its structural origin has been reviewed and discussed. Some of the interpretations that seem to be inconsistent with recent experimental results have been ruled out. The most likely structural origins for the occurrence of the FSDP have been highlighted and discussed in details.wave vector Q ( 4π sinθ λ = , where λ is the wavelength of the incident radiation and 2θ is the scattering angle) in the range 1 -2 Å −1 , and it has many structural anomalies [3] that have put this peak a subject of debate for more than two decades ago.Conventional neutron or X-ray scattering techniques involves measuring the static structure function, ( ) S Q , of the corresponding material which is then Fourier transformed to obtain the real-space correlations. Here, the ( ) S Q function is decomposed into sin waves of constant amplitude. Hence, Fourier transformation of a ( ) S Q that is delocalized over the observed Q-range results in relatively sharp features in the real space, giving rise to the first and second neighbor shells of atoms in the structure, more difficultly, when ( ) S Q has features that are localized in a limited Q-range (such as the FSDP). In this case, Fourier transformation results in rather delocalized features in the real space, conveying little information about the involved interatomic correlations. This difficulty makes it hard to elucidate the precise structural origin of the FSDP, despite the fact that the FSDP gives a clue to the extent of intermediate range order in the amorphous material. The position (Q 1 ) of the FSDP in reciprocal space suggests that Fourier components of period ≈

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“…The extent of modifications depends on the size of cations. The evolution of the FSDP in alkali borate glasses x Me 2 O–(1 – x )B 2 O 3 (Me = Li, Na, K, and Cs) for different x has been carefully studied by Crupi et al [ 30,31 ] It was shown that with increase in x , the prepeak appears at Q 1 smaller than Q m of FSDP in pure B 2 O 3 glass, whereas the latter peak broadens and shifts to higher values. The effect is stronger for large metallic atoms, like Cs, and is small for Li.…”

Section: Introductionmentioning

confidence: 99%

“…These results are in agreement with the simulations in the study by Gonzalez et al [ 32 ] Similar effect was observed also in silica glass modified by metallic oxide. [ 33 ] In the studies by Crupi et al, [ 30,31 ] it was supposed that the MRO in alkali borate glass arises from the periodicity of boundaries of nanovoids homogeneously distributed in the network. Modification of the network by metallic oxide leads to appearing of voids of larger size (depending on the size of Me ion) that modifies MRO.…”

Section: Introductionmentioning

confidence: 99%

Nanometric Fluctuations of Sound Velocity in Alkali Borate Glasses and Fragility of Respective Melts

Kojima

Novikov

Kofu

et al. 2020

Physica Status Solidi (b)

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The network structure of borate glass is remarkably modified by the addition of alkali metals. The alkali metal dependences of the first sharp diffraction peak (FSDP) and the boson peak (BP) are investigated in alkali borate glasses by elastic and inelastic neutron scattering experiments. With an increase in ionic radius of alkali ions, both the width ΔQ of FSDP and the BP energy decrease. The comparison of the characteristic length of medium‐range order (MRO) predicted by the FSDP and the position of the BP allows us to find the mean‐square fluctuations of the transverse sound velocity within series of alkali borate glasses. It is shown that the fragility of the respective alkali borate melts inversely correlates with the mean‐square fluctuations of the transverse sound velocity in glassy state.

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Intermediate range order in alkaline borate glasses

Cited by 9 publications

References 32 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

The First Sharp Diffraction Peak in the Total Structure Function of Amorphous Chalcogenide Glasses: Anomalous Characteristics and Controversial Views

Nanometric Fluctuations of Sound Velocity in Alkali Borate Glasses and Fragility of Respective Melts

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