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- W1993860458 abstract "A fragment of an archeological funerary urn from Campos dos Goytacazes, Brazil, was studied using electron paramagnetic resonance (EPR) and X-ray diffraction (XRD). The thermal stability of all paramagnetic species was studied with isothermal treatment. In the present study, the iron signal (Fe3+) cannot be used as a firing temperature reference for archeological pottery. The intensification of this signal with temperature is a consequence of Fe2+ oxidation, but this reaction occurs in a short-lived treatment at high temperature or in an extended treatment at lower temperature. However, the iron signal and three other paramagnetic species indicate that the urn was fired for an extended time (up to three days). The thermal stability of the three paramagnetic species indicates a firing temperature of around 500 °C in the inner layer, between 400 and 500 °C in the middle layer, and between 500 and 800 °C in the outer layer. The presence of kaolinite structures only in the middle portion is consistent with the temperature values estimated. A firing method for the funerary archeological urn is suggested." @default.
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- W1993860458 date "2011-02-01" @default.
- W1993860458 modified "2023-10-16" @default.
- W1993860458 title "A study of the firing temperature of archeological pottery by X-ray diffraction and electron paramagnetic resonance" @default.
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- W1993860458 doi "https://doi.org/10.1016/j.jpcs.2010.11.005" @default.
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