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Erschienen in:
2007 | OriginalPaper | Buchkapitel
Measurement Conditions and Procedures for Isothermal Thermogravimetric Studies
Erschienen in: Thermal Decomposition of Solids and Melts
Verlag: Springer Netherlands
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As follows from the consideration of the third-law method (Chapter 4), its use for determining the reaction enthalpy requires estimation of the equivalent pressure
P
eqp 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
?
2 s
?
1) and, hence, of the effective surface area of the decomposing sample. This problem, as applied to crystals, powders, and melts, is discussed below.