| People | Locations | Statistics |
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| Naji, M. |
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| Motta, Antonella |
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| Aletan, Dirar |
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| Mohamed, Tarek |
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| Ertürk, Emre |
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| Taccardi, Nicola |
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| Kononenko, Denys |
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| Petrov, R. H. | Madrid |
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| Alshaaer, Mazen | Brussels |
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| Bih, L. |
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| Casati, R. |
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| Muller, Hermance |
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| Kočí, Jan | Prague |
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| Šuljagić, Marija |
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| Kalteremidou, Kalliopi-Artemi | Brussels |
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| Azam, Siraj |
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| Ospanova, Alyiya |
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| Blanpain, Bart |
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| Ali, M. A. |
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| Popa, V. |
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| Rančić, M. |
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| Ollier, Nadège |
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| Azevedo, Nuno Monteiro |
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| Landes, Michael |
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| Rignanese, Gian-Marco |
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Salmon, Philip Stephen
University of Bath
in Cooperation with on an Cooperation-Score of 37%
Topics
Publications (17/17 displayed)
- 2024Pressure dependent structure of amorphous magnesium aluminosilicatescitations
- 2023Mapping the structural trends in zinc aluminosilicate glassescitations
- 2022Structure and related properties of amorphous magnesium aluminosilicatescitations
- 2021Structure of crystalline and amorphous materials in the NASICON system Na1+xAlxGe2- x(PO4)3citations
- 2019Ordering on different length scales in liquid and amorphous materialscitations
- 2019Structure of the intermediate phase glasses GeSe3 and GeSe4citations
- 2017Topological Ordering and Viscosity in the Glass-Forming Ge-Se System: The Search for a Structural or Dynamical Signature of the Intermediate Phasecitations
- 2017Structure of rare-earth chalcogenide glasses by neutron and x-ray diffractioncitations
- 2016Pressure-driven transformation of the ordering in amorphous network-forming materialscitations
- 2015Networks under pressurecitations
- 2015Pressure-dependent structure of the null-scattering alloy Ti0.676Zr0.324citations
- 2013Fragile glass - formers reveal their structural secrets
- 2013Identifying and characterising the different structural length scales in liquids and glasses: an experimental approachcitations
- 2011Structure of eutectic liquids in the Au-Si, Au-Ge, and Ag-Ge binary systems by neutron diffractioncitations
- 2010Structure of liquid and glassy ZnCl2citations
- 2009Atomic structure of the two intermediate phase glasses SiSe4 and GeSe4citations
- 2003Identification of the relative distribution of rare-earth ions in phosphate glassescitations
Places of action
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article
Identifying and characterising the different structural length scales in liquids and glasses: an experimental approach
Abstract
The structure of several network-forming liquids and glasses is considered, where a focus is placed on the detailed information that is made available by using the method of neutron diffraction with isotope substitution (NDIS). In the case of binary network glass-forming materials with the MX 2 stoichiometry (e.g. GeO 2 , GeSe 2 , ZnCl 2 ), two different length scales at distances greater than the nearest-neighbour distance manifest themselves by peaks in the measured diffraction patterns. The network properties are influenced by a competition between the ordering on these "intermediate" and "extended" length scales, which can be manipulated by changing the chemical identity of the atomic constituents or by varying state parameters such as the temperature and pressure. The extended-range ordering, which describes the decay of the pair-correlation functions at large -r, can be represented by making a pole analysis of the Ornstein-Zernike equations, an approach that can also be used to describe the large-r behaviour of the pair-correlation functions for liquid and amorphous metals where packing constraints are important. The first applications are then described of the NDIS method to measure the detailed structure of aerodynamically-levitated laser-heated droplets of "fragile" glass-forming liquid oxides (CaAl 2 O 4 and CaSiO 3 ) at high-temperatures (∼2000 K) and the structure of a "strong" network-forming glass (GeO 2 ) under pressures ranging from ambient to ∼8 GPa. The high-temperature experiments show structural changes on multiple length scales when the oxides are vitrified. The high-pressure experiment offers insight into the density-driven mechanisms of network collapse in GeO 2 glass, and parallels are drawn with the high-pressure behaviour of silica glass. Finally, the hydrogen-bonded network of water is considered, where the first application of the method of oxygen NDIS is used to measure the structures of light versus heavy water and a difference of ≃0.5% is found between the O-D and O-H ...