The stepwise isothermal analysis, SIA, was introduced by the author in the late seventies [1]. Together with quasi-isothermal analysis, QIA, introduced by Paulik [3] and the rate controlled thermal analysis, RCTA, introduced by Rouquerol [4], SIA thus is one of the pioneering techniques on which the modern sample controlled thermal analysis (SCTA) is based. One drawback with SIA is that it is not possible to determine the activation energy in kinetic studies as isothermal data is obtained by SIA. In order to overcome this the forced stepwise isothermal analysis (FSIA) was later introduced [5].
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