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Title: Chemistry versus phase constitution of yellow ancient tile glazes: A non-destructive insight through XAS
Authors: Figueiredo, M.O.
Veiga, J.P.
Silva, T.P.
Mirao, J.P.
Pascarelli, S.
Keywords: Tile-glazes
Sb K-edge
Pb L 3 -edge
Issue Date: 2005
Publisher: Elsevier
Citation: 20. Silva, J.P. Mirão, S. Pascarelli (2005) Chemistry versus phase constitution of yellow ancient tile glazes: A non-destructive insight through XAS. Nuclear Instruments and Methods in Physics Research Section B: Beam Interactions with Materials and Atoms, Vol. 238 (1-4), pp. 134-137.
Abstract: Using synchrotron radiation-based analytical (SRXRF) and spectroscopic (XAS) non-destructive techniques, a study was carried out on lead-rich, tin-opacified yellow glazes (silica-lime-alkali type glasses) decorating ancient tiles (17–19th century). These glasses have a rather complex chemistry, being currently assumed that the yellow pigment used for centuries – a pyrochlore-type double oxide of lead and antimony – prevails within the glaze, despite Sb(3+) being recognized as a net- work-forming cation in glasses. Minerals and synthetics with known crystal structure were used as model compounds to interpret X-ray absorption spectroscopy data at Sb K-edge and Pb L 3 -edge collected from ancient glazes. Theoretical modelling of Sb 1s XANES spectra was applied to demonstrate that antimony alone may be responsible for the yellow colour through a finely dispersed pyrochlore-type Sb-oxide, while lead remains hosted in the glassy matrix.
Type: article
Appears in Collections:CGE - Publicações - Artigos em Revistas Internacionais Com Arbitragem Científica

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