La diffraction des neutrons et des rayons X pour l'étude structurale des liquides et des verres

Fischer, Henry E.; Salmon, Philip S.; Barnes, Adrian C

doi:10.1051/jp4:200300016

Cited by 10 publications

(9 citation statements)

References 12 publications

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“…[22] It is not appropriate here to go into a lengthy discussion of these corrections for either x-rays or neutrons. It will be assumed that for the various types of diffraction experiments appropriate corrections for inelasticity and other systematic effects, such as sample attenuation and multiple scattering, can be performed [23]. Even so different experimentalists often have different methods of correcting their data, so that, due to uncertainties in these corrections, independent experiments on the same material under the same conditions do not necessarily yield identical data.…”

Section: Diffraction Techniques As a Probe Of Structurementioning

confidence: 99%

Structural transformations in amorphous ice and supercooled water and their relevance to the phase diagram of water

Soper

2008

Molecular Physics

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Section: Diffraction Techniques As a Probe Of Structurementioning

confidence: 99%

Structural transformations in amorphous ice and supercooled water and their relevance to the phase diagram of water

Soper

2008

Molecular Physics

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“…Generally, this is expressed as the differential cross section, which has distinct (coherent) and self-(incoherent) scattering parts. The total interference function, F(Q), is the distinct scattering and it is convenient to use the convention of Faber-Ziman [33] to express the total interference function F(Q), in terms of a dimensionless static structure factor S(Q) [29,30]:…”

Section: Introductionmentioning

confidence: 99%

“…Short-range order is usually described by a probability function, the probability of finding an atom at a distance, r, from an atom at the origin and this is the radial distribution function q(r), often referred to as a pair distribution function. The pair distribution function is obtained by Fourier transformation of the total structure factor, S(Q), obtained from diffraction data from liquids, glasses and amorphous materials that is probed by radiation with wavelengths comparable to the inter-atomic separation [26][27][28][29][30][31][32].…”

Section: Introductionmentioning

confidence: 99%

In situ diffraction studies of magnesium silicate liquids

2008

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Primitive MgO-SiO 2 liquids dominate the early history of the Earth and Terrestrial planets. The structures of these liquids and structure-dependent properties, such as viscosity and diffusion, are considered important in the evolution of these planets, however, MgO-SiO 2 liquids are refractory and do not form glasses easily and it is difficult to measure the structure of these liquids. Container-less synthesis techniques have been used to produce glasses that range in composition from 50 to 33% SiO 2 , corresponding to the compositions of two important mantle minerals: enstatite and forsterite. The structure of these glasses has been determined using combined neutron and high-energy diffraction and show changes in the short-range order as a function of composition. These changes include a jump in Mg-O coordination number at the limit to the formation of the silicate network in forsterite composition glass. These results imply a similar change in the structure of the liquid. Accordingly, the structures of forsterite and enstatite liquids have been determined using high-energy X-rays and a specialized sample environment, a containerless levitator. The main qualitative structural differences between MgSiO 3 and Mg 2 SiO 4 glasses are also observed in the melt. Liquid MgSiO 3 is interpreted as forming a relatively 'strong' network of SiO 4 tetrahedra, whereas the Mg 2 SiO 4 liquid is ''fragile'' and dominated MgO n (n = 4, 5, 6) polyhedra and highly mobile oxygen ions. The results differ significantly from previously reported X-ray diffraction data for liquid MgSiO 3 .

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“…Here Qmax and Qmin represent the upper and lower limits of the finite range in reciprocal space studied and  is the atomic number density 21 . The G(r) function emphasizes local structure.…”

Section: Methodsmentioning

confidence: 99%

“…Results are reported first as reciprocal space correlations of the total scattering (S(Q)) that represents the weighted sum of partial structure factors, expressed using the Faber-Ziman formalism 21 . The sine Fourier transform of the total, multi-component structure factor provides the total (pseudo-nuclear) pair distribution function, G(r).…”

Section: Methodsmentioning

confidence: 99%

Structural studies of Bi2O3-Nb2O5-TeO2 glasses

Wilding

Delaizir

Benmore

et al. 2016

Journal of Non-Crystalline Solids

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Bi2O3-Nb2O5-TeO2 glasses show unusual annealing behavior with appearance of spherulites within the matrix glass structure for the Bi0.5Nb0.5Te3O8 composition. The textures resemble those found previously among polyamorphic Al2O3-Y2O3 glasses containing metastably co-existing high-and lowdensity phases produced during quenching. However the spherulites produced within the Bi2O3-Nb2O5-TeO2 glass are crystalline and can be identified as an "anti-glass" phase related to -Bi2Te4O11. We used high energy synchrotron X-ray diffraction data to study structures of binary and ternary glasses quenched from liquids within the Bi2O3-Nb2O5-TeO2 system. These reveal a glassy network based on interconnected TeO4 and TeO3 units that is related to TeO2 crystalline materials but with larger Te...Te separations due to the presence of TeO3 groups and non-bridging oxygens linked to modifier (Bi 3+ , Nb 5+ ) cations. Analysis of the viscosity-temperature relations indicates that the glassforming liquids are "fragile" and there no evidence for a LLPT occurring in the supercooled liquid. The glasses obtained by quenching likely correspond to a high-density amorphous (HDA) state. Subsequent annealing above Tg shows mainly evidence for crystallization of the "anti-glass" tellurite phase. However, some evidence may exist for simultaneous formation of nanoscale amorphous spherultites that could correspond to the LDA polyamorph. The quenching and annealing behavior of Bi2O3-Nb2O5-TeO2 supercooled liquids and glasses is compared with similar materials in the Al2O3-Y2O3 system.

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La diffraction des neutrons et des rayons X pour l'étude structurale des liquides et des verres

Cited by 10 publications

References 12 publications

Structural transformations in amorphous ice and supercooled water and their relevance to the phase diagram of water

Structural transformations in amorphous ice and supercooled water and their relevance to the phase diagram of water

In situ diffraction studies of magnesium silicate liquids

Structural studies of Bi2O3-Nb2O5-TeO2 glasses

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