NDLI: Mineralogy, 57Fe Mössbauer spectra and magnetization of chalcolithic pottery

Content Provider	Springer Nature Link
Author	Keller, R. Masch, L. Pohl, J. Schmidbauer, E.
Copyright Year	2005
Abstract	Three chalcolithic pottery sherds, paint removed from the surface of each sherd, and an unheated red pigment (Tell-Halaf culture, Turkey) were analysed within the frame of archaeometric studies using mineralogical methods, 57Fe Mössbauer spectroscopy, magnetization and rotational hysteresis data. From mineralogical results, the individual minerals forming the cores of the sherds were determined. It was found that the sherds are lime-rich. High temperature X-ray analysis on comparable Ca-rich material showed that the established composition is consistent with a firing temperature of 750-950°C. Apart from the pigment, each Mössbauer spectrum of Fe-bearing components consists of dominating paramagnetic doublets, arising mostly from silicate phases, and of a six-line pattern with reduced intensity, due to ferri- and/or antiferromagnetic Fe-oxide phases. For three samples, an Fe3+ silicate component of the spectra is clearly dominating, which points to oxidizing conditions during firing. For the others Fe2+ and Fe3+ components occur in about equal intensities. For the pigment, the magnetic sextet is of similar intensity to the Fe3+ silicate component. From magnetic analysis of ferrimagnetic phases it follows that a low percentage of particles of solid solutions γ-Fe2O3 – Fe3O4 exist, probably in part ≤0.1 μm in diameter. The ferrimagnetic particles of at least one paint are probably covered by a thin layer of hematite as found from rotational hysteresis data. An attempt is made to draw conclusions from the experimental results, regarding the firing conditions of the sherds and paints.
Starting Page	165
Ending Page	174
Page Count	10
File Format	PDF
ISSN	03421791
Journal	Physics and Chemistry of Minerals
Volume Number	32
Issue Number	3
e-ISSN	14322021
Language	English
Publisher	Springer-Verlag
Publisher Date	2005-05-12
Publisher Place	Berlin, Heidelberg
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	X-ray diffraction 57Fe Mössbauer spectroscopy Magnetization Ceramic sherds
Content Type	Text
Resource Type	Article
Subject	Geochemistry and Petrology Materials Science

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