Technique for determination of accurate heat capacities of volatile, powdered, or air-sensitive samples using relaxation calorimetry
Authors:
- 1 September 2006
- journal article
- Published by AIP Publishing in Review of Scientific Instruments
- Vol. 77 (9) , 096108
Abstract
We introduce a four-step technique for the accurate determination of the heat capacity of volatile or air-sensitive samples using relaxation calorimetry. The samples are encapsulated in a hermetically sealed differential scanning calorimetry pan, in which there is an internal layer of Apiezon N grease to assist thermal relaxation. Using the Quantum Design physical property measurement system to investigate benzoic acid and copper standards, we find that this method can lead to heat capacity determinations accurate to ±2% over the temperature range of 1–300K, even for very small samples (e.g., <10mg and contributing ca. 20% to the total heat capacity).Keywords
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