Abstract
The kinetics and mechanism of the thermal dehydration of CaC 2O 4 · H 2O were studied by means of thermogravimetry, both at constant temperature and linearly increasing temperature. The dehydration mechanism was determined as a random nucleation and subsequent growth mechanism, an Avrami—Erofeyev law with m ≅ 2. The mechanistic equation could be expressed as [−ln(1 −α)] 11.904 = kt where α is the fraction dehydrated at time t and k is the rate constant. The plausibility of the Avrami—Erofeyev mechanism in the thermal dehydration of CaC 2O 4 · H 2O is discussed.
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