The structure of sodium silicate glass from neutron diffraction and modeling of oxygen-oxygen correlations (original) (raw)

Abstract

Neutron diffraction is arguably the most reliable experimental method for the determination of the bond length distribution and coordination number of ions in glasses. 1 For a cation A in an oxide glass, this is achieved by analysis of the first A-O peak in the neutron correlation function. One of the main difficulties for this analysis can arise from the overlap between the A-O peak and the first O-O peak, which arises from distances between pairs of oxygen atoms in the basic structural units. We show here that O-O coordination numbers can be calculated, even for complex glasses, provided that the environment of the glass network forming cations is known. The O-O coordination numbers can then be used as a basis for taking the O-O peak into account so that the bond length distribution of an ion can be revealed.

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