| 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
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article
Topological Ordering and Viscosity in the Glass-Forming Ge-Se System: The Search for a Structural or Dynamical Signature of the Intermediate Phase
Abstract
The topological ordering of the network structure in vitreous Ge<sub>x</sub>Se<sub>1-x</sub> was investigated across most of the glass-forming region (0 < x < 0.4) by using high resolution neutron diffraction to measure the Bhatia-Thornton number-number partial structure factor. This approach gives access to the composition dependence of the mean coordination number n and correlation lengths associated with the network ordering. The thermal properties of the samples were also measured by using temperature-modulated differential scanning calorimetry. The results do not point to a structural origin of the so-called intermediate phase, which in our work is indicated for the composition range 0.175(8) < x < 0.235(8) by a vanishingly-small non-reversing enthalpy near the glass transition. The midpoint of this range coincides with the mean-field expectation of a floppy-to-rigid transition at x = 0.20. The composition dependence of the liquid viscosity, as taken from the literature, was also investigated to look for a dynamical origin of the intermediate phase, using the Mauro-Yue-Ellison-Gupta-Allan (MYEGA) model to estimate the viscosity at the liquidus temperature. The evidence points to a maximum in the viscosity at the liquidus temperature, and a minimum in the fragility index, for the range 0.20 < x < 0.22. The utility of the intermediate phase as a predictor of the material properties in network glass-forming systems is discussed.