Measurement Conditions and Procedures for Isothermal Thermogravimetric Studies

Measurement Conditions and Procedures for Isothermal Thermogravimetric Studies 

As follows from the consideration of the third-law method (Chapter4), its use for determining the reaction enthalpy requires estimation of the equivalent pressure Peqp of the gaseous product under the conditions of free-surface vaporization of the reactant. This, in turn, involves determination of the absolute rate of decomposition J (kg m and, hence, of the effective surface area of the decomposing sample. This problem, as applied to crystals, powders, and melts, is discussed below. 

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