Measurement of specific heat capacity via fast scanning calorimetry—Accuracy and loss corrections

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  • Mettler-Toledo GmbH

Abstract

This study explores specific heat capacity (c p ) measurements via fast scanning calorimetry, with a focus on correcting measured heat flow by accounting for temperature dependent heat losses. Using MultiSTAR-UFS1 sensors with the Mettler-Toledo Flash-DSC 2+, c p of Pb (99.998% purity) was measured in dependence of the sample mass and scanning rate. Masses from 0.3–5 μg were evaluated at rates of 100, 1000 and 2000 K s −1 in the temperature range −20 to 320 °C. Two correction methods are shown and compared to c p results without corrections. Heat loss corrections are mandatory when measuring c p , but are in particular important for low masses and rates. High consistency was found between the two proposed correction procedures giving good confidence in their viability. A slight but consistent overestimation of c p compared to literature casts uncertainty upon the determined sample mass. Whilst the systems under study in this work encompass only pure Pb, the arguments and procedures of the shown method of c p determination are applicable to any system in the absence of physical transformations.

Details

Original languageEnglish
Pages (from-to)12-20
Number of pages9
JournalThermochimica Acta
Volume677.2019
Issue numberJune
Publication statusPublished - 13 Jun 2019