Journal article

Temperature evolution inside a pot during experimental surface (bonfire) firing

  • Maggetti, Marino Department of Geosciences, University of Fribourg, Switzerland
  • Neururer, Christoph Department of Geosciences, University of Fribourg, Switzerland
  • Ramseyer, Denis Laténium, Archaeology Museum and Institute of Prehistory, Hauterive, Switzerland
Published in:
  • Applied Clay Science. - 2011, vol. 53, no. 3, p. 500-508
English Time–temperature evolutions of different parts inside a pot were recorded during three experimental surface (bonfire) firings. The experimental vessels were shaped from a calcareous clay, tempered with 30% vol. of oolithic limestone. The temperature–time recording showed: (1) Tmax. was reached after 12–22 min and differed between the firings as well as inside individual vessels; (2) the range of the thermal variation within one single firing was found to be as high as 390 °C, and up to 220 °C on a specific cross-section; (3) the lowest temperature was not systematically recorded in the core of the object, as is generally expected. Under the polarizing microscope, no textural and mineralogical changes were observed in the ceramic bodies. This is sustained by powder X-ray diffraction analyses evidencing no dolomite or calcite breakdown. The presence or absence of specific illite and chlorite peaks can be generally related to Tmax. and soaking time, but equivalent firing temperature estimations do not match the measured temperatures.
Faculté des sciences et de médecine
Département de Géosciences
  • English
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