Instrumentation for structure measurements on highly non-equilibrium materials

Weber, Jacques; Benmore, C. J.; Wilding, Martin C.; Neuefeind, J.; Parise, John B.

doi:10.1017/s2044820110000080

Cited by 2 publications

(1 citation statement)

References 5 publications

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“…For glasses, the study of (usually) small structural changes around the glass transition temperature which may be associated with large changes in the dynamical behavior occuring has been of particular interest [56,[213][214][215][216][217][218][219][220][221][222][223][224][225][226][227][228][229]. This has led to the development of rapid data acquisition methods (up to ∼100 ms) applied to glass forming liquids upon cooling from very high temperatures [215][216][217][218][219] as well as studies of the stable melts [220][221][222][223][224]. Time-resolved measurements have been made on supercooled oxide liquids held in aerodynamic levitators from temperatures up to 2500 • C [225][226][227] (see left hand side of Figure 8) and liquid metals suspended in electrostatic levitators [228,229].…”

Section: Extreme Environmentsmentioning

confidence: 99%

A Review of High-Energy X-Ray Diffraction from Glasses and Liquids

Benmore

2012

ISRN Materials Science

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This paper summarizes the scientific trends associated with the rapid development of the technique of high-energy X-ray diffraction over the past decade pertaining to the field of liquids, glasses, and amorphous materials. The measurement of high-quality X-ray structure factors out to large momentum transfers leads to high-resolution pair distribution functions which can be directly compared to theory or combined with data from other experimental techniques. The advantages of combining highly penetrating radiation with low angle scattering are outlined together with the data analysis procedure and formalism. Also included are advances in high-energy synchrotron beamline instrumentation, sample environment equipment, and an overview of the role of simulation and modeling for interpreting data from disordered materials. Several examples of recent trends in glass and liquid research are described. Finally, directions for future research are considered within the context of past and current developments in the field.

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Section: Extreme Environmentsmentioning

confidence: 99%

A Review of High-Energy X-Ray Diffraction from Glasses and Liquids

Benmore

2012

ISRN Materials Science

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In situ measurement of the structure of supercooled oxide liquids

et al. 2011

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This paper will describe the results of in situ high-energy X-ray measurements performed on stable and supercooled oxide liquids using containerless techniques. As will be discussed in the companion paper (Weber et al.), the use of an aerodynamic levitator furnace with laser heating allows the structures of refractory oxide liquids to be probed. Because of the contactless nature of this sample environment liquids can be deeply supercooled, and this provides opportunities to study the metastable structures of supercooled liquids. Of particular interest are the so-called fragile liquids that depart from Arrhenius-law viscosity behaviour and that, by definition, have temperature-dependent structures. The focus of this paper is the study of two oxide systems, MgO-SiO 2 and Al 2 O 3 -SiO 2 . These two liquids have highly disordered stable liquid structures that differ substantially from the structures of the equivalent glasses. We present data showing how these structures change when supercooled and demonstrate dramatic changes in short-range (coordination number) and intermediate-range order during vitrification. These data have been collected by isothermal measurement and also fast quenching methods using the recently developed method of rapid acquisition using a Perkin Elmer amorphous silicon flat panel detector; this gives a large Q coverage for incident energies of >115 keV. The rapid data acquisition enables the vitrification process to be observed directly.

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Instrumentation for structure measurements on highly non-equilibrium materials

Cited by 2 publications

References 5 publications

A Review of High-Energy X-Ray Diffraction from Glasses and Liquids

A Review of High-Energy X-Ray Diffraction from Glasses and Liquids

In situ measurement of the structure of supercooled oxide liquids

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