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Issue 9, 2004
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Structure and bonding in single- and two-phase alumina-based glasses

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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.

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Publication details

The article was received on 19 Nov 2003, accepted on 13 Feb 2004 and first published on 15 Mar 2004


Article type: Paper
DOI: 10.1039/B314957A
Citation: Phys. Chem. Chem. Phys., 2004,6, 2480-2483
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    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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