Several high sensitivity instruments are available from different producers. In a typical run, calorimetric cells (sample and reference) are heated up with scan rates ranging between 0.5-1 down to 0.01 K/min. Several scan rates (temperature-time profiles) are usually investigated to optimise the proper equilibration time with the best signal-to-noise ratio, as low scanning rates produce small heat flow signals (energy per unit time). Distortion of the shape of the heat capacity function can be effectively corrected by the approximate Tian equation (Calvet and Prat, 1963). However, in view of the low scanning rates commonly used and the instrumental characteristic times (of the order of 100 s), this correction is taken as negligible under most experimental conditions.
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