科研之友
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摘要
An original structural study of carbonization of organic materials (wood samples) was performed by coupling High Resolution Transmission Electron Microscopy (HRTEM) and Raman microspectrometry. It allows us to propose to use the evolution of their Raman spectra as a new and relevant thermometer. It is based upon the direct measurement, without previous curve fitting, of peak height ratio of the D (defect band) and G (graphite band), plotted versus the Highest Temperature of Treatment (HTT). It is shown that: (i) the type of organic precursor (saccharose, different woods) has negligible effect on this Raman thermometer; (ii) the effect of residence time at HTT is weak, specified and quantified. This allows a reasonable estimation of firing temperatures: +/- 20 degrees C in the 600-900 degrees C range in wood fires and +/- 40 degrees C for temperatures up to 1200 degrees C in pottery furnaces. As the HTT is recorded, the HD/HG ratio is thus a paleothermometer. It is a new tool for archaeometry. It can be used to estimate HTT but also the heating conditions (type of fire or furnaces...) which produced the carbonized material. Such information is thus very useful to archaeologists, and could be used in other fields of investigation as fire expertise.
- 出版日期2016-6
