Kinetics and mechanism of the thermal dehydration stages of BaCl2 · 2 H2O by means of simultaneous TG—DSC

The kinetics of the thermal dehydration stages of BaCl2 · 2 H2O were studied by means of TG—DSC recorded simultaneously at linearly increasing temperatures. Both dehydration stages were regulated by the random nucleation and subsequent growth mechanism. The mechanistic equation was expressed approximately as (with m ∼ 3 for both stages) where α is the fraction dehydrated at time t and k is the rate constant. The kinetic parameters from TG were in good agreement with those from the corresponding DSC.