Concerning the use of standards for identifying coordination environments in glasses

FORDER, S D, HANNANT, O M, BINGHAM, Paul and HAND, R J (2010). Concerning the use of standards for identifying coordination environments in glasses. Journal of Physics: Conference Series, 217, 012072.

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Official URL: http://dx.doi.org/10.1088/1742-6596/217/1/012072
Link to published version:: 10.1088/1742-6596/217/1/012072

Abstract

It is an established methodology to use crystallographically well-defined standard materials for understanding site geometries in glasses. Here we discuss the benefits and the limitations of this approach for the investigation by Mössbauer and EXAFS of Fe2+ Fe3+ in aluminosilicate glasses. As a case study we specifically consider [5]Fe2+ [5]Fe3+ sites and whether these exist in our glasses; and if so, whether they have defined site geometries or occur simply as a consequence of the site distortions and Fe-O bond length distributions. Results are consistent with the existence of [5]Fe2+ and [5]Fe3+ but do not prove this because site distortion and a mixture of 4- and 6-coordinated sites can produce comparable results. This exemplifies the need for caution when interpreting glass data based on standards.

Item Type: Article
Research Institute, Centre or Group: Materials and Engineering Research Institute > Structural Materials and Integrity Research Centre > Centre for Corrosion Technology
Identification Number: 10.1088/1742-6596/217/1/012072
Depositing User: Hilary Ridgway
Date Deposited: 29 Aug 2012 15:03
Last Modified: 29 Aug 2012 15:03
URI: http://shura.shu.ac.uk/id/eprint/5710

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