Abstract
A DTA apparatus has been built to examine some of the errors neglected in present quantitative DTA. The heat transfer characteristics within DTA systems were found to limit in situ measurements of powder thermal conductivity. It was also demonstrated that the negligence of heat lost to the DTA block from the sample cell during an exothermic reaction and heat gained from the DTA block by the sample cell during endothermic reactions lead to large errors in quantitative estimations. A modified double differential thermocouple DTA was designed to take these heat losses into account. The apparatus was calibrated with CaCO3 and kaolinite endotherms and the kaolinite exotherm and tested on the SrCO3 rhombic ⇌ trigonal inversion endotherm. The result was found to be in good agreement with accepted literature values.
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