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Closer relation between thermal analysis and calorimetry

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Abstract

Several DTA experiments followed by calorimetric works are reviewed here to emphasise the importance of complementary role of both techniques. The thermal analysis is advantageous in the sense that it gives quickly the overall view of thermal behaviour of a material under various conditions. Calorimetric work provides accurate heat capacity data which enable to derive thermodynamic functions including the enthalpy and entropy. The latter quantity is especially important in judging whether the material obeys the third law of thermodynamics. However, calorimetric work leads occasionally to an erroneous conclusion if the work is not preceded by thermal analysis performed under various conditions. Sometimes, quality of information obtained by DTA exceeds that obtained by laborious calorimetry.

Zusammenfassung

Es wird ein Rückblick auf verschiedene von kalorimetrischen Arbeiten gefolgten DTA-Experimenten gegeben, um die Wichtigkeit der einander ergänzenden Rolle beider Techniken zu betonen. Der Vorteil der Thermoanalyse besteht darin, einen schnellen Gesamtüberblick über das thermische Verhalten der Substanzen unter verschiedenen Bedingungen zu liefern. Kalorimetrische Arbeiten liefern präzise Wärmekapazitätsangaben, die eine Ableitung thermodynamischer Funktionen wie Enthalpie und Entropie ermöglichen. Letzterer Größe kommt besondere Bedeutung bei der Beurteilung zu, ob eine Substanz dem dritten thermodynamischen Gesetz unterliegt. Kalorimetrische Arbeiten können jedoch gelegentlich zu Fehlschlüssen führen, wenn keine Thermoanalyse unter verschiedenen Bedingungen vorangeht. Manchmal gehen die mittels DTA erhaltenen Informationen über die mittels Kalorimetrie ermittelten hinaus.

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Suga, H. Closer relation between thermal analysis and calorimetry. Journal of Thermal Analysis 42, 331–342 (1994). https://doi.org/10.1007/BF02548520

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