Date of Award

1977

Degree Type

Thesis

Degree Name

Doctor of Philosophy (PhD)

Department

Physics

Supervisor

Crispin Calvo

Abstract

The crystal structures of PbV₂O₆ and α-VPO₅, both from within the glass-forming region of PbO-V₂O₅-P₂O₅, have been determined by X-ray methods to help provide models for the local structure of the glass. A temperature dependent displacive disordering of oxygen atoms is found in α-VPO₅. A specimen has been studied which is still ordered at room temperature but appears to be vanadium rich.

X-ray scattering intensities, measured for five compositions of V₁₊ᵪP₁₋ᵪO₅ glass, are compared with a model for the local structure of the glass based upon structural features from a-VPO₅. Available data on the physical properties of the glass, such as density and electrical conductivity, are discussed in relation to the proposed structural model.

Methodological problems of X-ray scattering from glass, involved with Compton scattering and multiple scattering, are discussed.

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