A XANES study on the structural role of zinc in ancient tile glazes of Portuguese origin

Lead‐rich blue‐and‐white tile glazes (16th to 17th century, Portuguese manufacture) were studied by x‐ray absorption near‐edge spectroscopy (XANES) to assess the speciation and coordination environment of zinc, a fuser metal commonly used along with lead in ancient glazes. Zincite (ZnO) and smithson...

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Bibliographic Details
Published in:X-ray spectrometry 2008-07, Vol.37 (4), p.458-461
Main Authors: Veiga, J. P., Figueiredo, M. O.
Format: Article
Language:English
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Summary:Lead‐rich blue‐and‐white tile glazes (16th to 17th century, Portuguese manufacture) were studied by x‐ray absorption near‐edge spectroscopy (XANES) to assess the speciation and coordination environment of zinc, a fuser metal commonly used along with lead in ancient glazes. Zincite (ZnO) and smithsonite (ZnCO3) were used as model compounds for Zn2+ ions in tetrahedral and octahedral coordinations, respectively and theoretical simulations of Zn 1s XANES spectra were undertaken using the FEFF code based on the full multiple‐scattering approach. Comparison between calculated and actual spectra collected from the glazes showed differences that are discussed in terms of oxygen‐anion linkages within the silica‐rich glassy matrix. Obtained results support the conclusion that zinc assumes a low‐coordination environment, most probably tetrahedral, in the studied ancient tile glazes. Copyright © 2008 John Wiley & Sons, Ltd.
ISSN:0049-8246
1097-4539
DOI:10.1002/xrs.1089