Determination of standard enthalpy of vaporization and thermal decomposition reactions from derivative thermogravimetric (DTG) curves

摘要

The paper proposes the use of the derivative thermogravimetric (DTG) curve for the acquisition of equilibrium vapor pressure and dissociation pressure for the materials and derivation of their standard enthalpy of formation from single DTG curve recorded under optimum experimental conditions, such as heating rate and the sweep rate of the carrier gas passed over the sample. The vapor pressure and the standard enthalpy of sublimation (Δ_(sub)H ° _(298.15)) of CdI_2 and the dissociation pressure and the standard enthalpy of formation of CaCO_3 derived from their DTG curves are found to be in good agreement with the best assessed values reported in the literature.