Concerning the use of standards for identifying coordination environments in glasses

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...

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Bibliographic Details
Published in:Journal of physics. Conference series 2010-03, Vol.217 (1), p.012072
Main Authors: Forder, S D, Hannant, O M, Bingham, P A, Hand, R J
Format: Article
Language:English
Subjects:
Aluminosilicates
Aluminum silicates
Crystallography
Physics
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Summary: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.
ISSN:1742-6596
1742-6588
1742-6596
DOI:10.1088/1742-6596/217/1/012072