Issue 9, 2004

Structure and bonding in single- and two-phase alumina-based glasses

Abstract

Pulsed neutron and high energy X-ray diffraction experiments on single- and two-phase Al2O3–Y2O3 and single-phase Al2O3–La2O3 glasses suggest that a polyamorphic phase transition occurs via changes in the Y–O coordination and connectivity. The transformation from a high temperature to a low temperature amorphous phase is mainly associated with the formation of YO8 polyhedra at the expense of YO7 polyhedra. The transition produces a more ordered network structure with increased oxygen connectivity, while maintaining the overall metal∶oxygen stoichiometry. It is estimated that for the two-phase sample studied ∼12% of the Y ions had transformed to the higher coordinate form in the supercooled liquid as the onset of the glass transition was reached.

Article information

Article type
Paper
Submitted
19 Nov 2003
Accepted
13 Feb 2004
First published
15 Mar 2004

Phys. Chem. Chem. Phys., 2004,6, 2480-2483

Structure and bonding in single- and two-phase alumina-based glasses

R. Weber, C. J. Benmore, J. Siewenie, J. Urquidi and T. S. Key, Phys. Chem. Chem. Phys., 2004, 6, 2480 DOI: 10.1039/B314957A

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