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Issue 8, 2014
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A XANES study of chromophores: the case of black glass

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Abstract

We studied the Fe K-edge X-ray absorption near edge (XANES) spectra of several Roman black glass fragments in order to determine the Fe3+/ΣFe ratio of these materials. The selected archaeological glass samples cover the period 1st–5th century AD in nine different sites of the North Western provinces of the Roman Empire. The fragments belong to two different compositional groups demonstrating a diachronic evolution: early Roman HMG (High Magnesia Glass) and Roman Imperial LMG (Low Magnesia Glass). The first group contains natural Fe levels (below 2 wt% as Fe2O3), while the LMG has concentrations above 5 wt%. This difference is also reflected by Fe3+/ΣFe values. Low iron glass was produced under strongly reducing conditions in order to obtain the black colour, with average Fe3+/ΣFe values ≈ 0.17. LMG glass is somewhat more oxidised (Fe3+/ΣFe ≈ 0.4–0.5). While HMG glass required active control of the furnace environment, LMG was made under ambient atmosphere and its higher oxidation degree is mainly determined by the chemistry of the raw glass.

Graphical abstract: A XANES study of chromophores: the case of black glass

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Article information


Submitted
14 Nov 2013
Accepted
04 Feb 2014
First published
04 Feb 2014

Anal. Methods, 2014,6, 2662-2671
Article type
Paper
Author version available

A XANES study of chromophores: the case of black glass

A. Ceglia, G. Nuyts, S. Cagno, W. Meulebroeck, K. Baert, P. Cosyns, K. Nys, H. Thienpont, K. Janssens and H. Terryn, Anal. Methods, 2014, 6, 2662
DOI: 10.1039/C3AY42029A

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