Thermal power measurements in a differential-heat-conduction-scanning calorimeter at low temperature-scanning rates

The energy resolution and the ability to separate different impulsive phenomena in a heat-conduction calorimeter have been analyzed. Using a very simple model of localized constants, the experimental conditions required for a proper determination of the energy change in a first-order phase transitio...

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Bibliographic Details
Published in:Thermochimica acta 1987-11, Vol.121, p.333-342
Main Authors: Ortín, Jordi, Torra, Vicenç, Tachoire, Henri
Format: Article
Language:English
Subjects:
Exact sciences and technology
Instruments, apparatus, components and techniques common to several branches of physics and astronomy
Physics
Thermal instruments, apparatus and techniques
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Summary:The energy resolution and the ability to separate different impulsive phenomena in a heat-conduction calorimeter have been analyzed. Using a very simple model of localized constants, the experimental conditions required for a proper determination of the energy change in a first-order phase transition are obtained. In particular, the work deals with the calorimeters currently used to study the energy change and the thermal dynamics of shape-memory alloys during a martensitic transformation. These calorimeters work at low rates of temperature scanning, around 0.5 K min −1. Our results, in addition, show how similar problems can be dealt with when operating conventional thermal analysis devices, such as DSC and DTA.
ISSN:0040-6031
1872-762X
DOI:10.1016/0040-6031(87)80183-1