Abstract
In this study, 57Fe Mössbauer spectroscopy has been applied to fragments of a mural painting excavated at Morgadal Grande, Mexico, to characterize the pigments used. A sextet attributable to hematite (α-Fe2O3) was clearly detected in the red fragments. The spectra of orange fragments showed a doublet attributable to paramagnetic high-spin Fe3+, which presumably originates from goethite (α-FeOOH) exhibiting superparamagnetic relaxation due to its small particle size. The blue fragments contained little iron. The scattered X-ray Mössbauer spectra revealed that the thickness of the pigments was larger than 20 μm.
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Kuno, A., Matsuo, M., Soto, A.P. et al. Mössbauer Spectroscopic Study of a Mural Painting from Morgadal Grande, Mexico. Hyperfine Interactions 156, 431–437 (2004). https://doi.org/10.1023/B:HYPE.0000043264.62906.6b
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DOI: https://doi.org/10.1023/B:HYPE.0000043264.62906.6b