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In situ measurement of the structure of supercooled oxide liquids

Published online by Cambridge University Press:  28 February 2011

M. Wilding*
Affiliation:
Institute of Mathematics and Physics, Aberystwyth University, Aberystwyth Sy23 3BZ, UK
C. J. Benmore
Affiliation:
Advanced Photon Source, Argonne National Laboratory, Argonne, IL 60439, USA
J. K. R. Weber
Affiliation:
Materials Development Inc., Arlington Heights, IL 6004, USA
J. B. Parise
Affiliation:
Department of Geosciences, Department of Chemistry, Stony Brook University, Stony Brook, NY 11794, USA
*
Email address for correspondence:mbw@aber.ac.uk
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Abstract

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–SiO2 and Al2O3–SiO2. 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.

Type
Poster paper
Copyright
Copyright © Diamond Light Source Ltd 2011

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References

REFERENCES

Benmore, C. J., Weber, J. K. R., Wilding, M. C., Du, J. & Parise, J. B. 2010 Temperature-dependence structural heterogeneity in calcium silicate liquids. Phys. Rev. B 82 (1), 224202 (2010).CrossRefGoogle Scholar
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Wilding, M. C., Benmore, C. J. & Weber, J. K. R. 2010 Experimental evidence of tetrahedral oxygen triclusters in liquid aluminosilicates. J. Phys. Chem. B 114 (17), 57425746.CrossRefGoogle Scholar