Estimation of Firing Temperature of Some Ancient potteries of Tamilnadu, India by FT-IR spectroscopic technique

摘要

The firing temperature of the ancient pottery provides basics for understanding many aspects of ancient technology such as manufacturing techniques and functional relationships between specific resource manufacturing combinations. The firing temperature of ancient a pottery is based primarily on changes of physical characteristics occurring when clay minerals are heated. In the present work, the ancient potteries are collected from the Nilgiri and Perumbair of Tamilnadu is subjected to IR studies for firing temperature measurement. The mineral composition and firing condition are inferred from the FT-IR spectrum. To estimate the upper limit of firing temperature of pottery fragments, the specimens were refried at different temperature and the FT-IR spectrum was recorded. The interpretation of results is made from the IR characteristics absorption bands. Spectroscopic results indicated that these potteries were refried to less than 900 ºC.