Relationship between the DTA peak and phase diagram : symbiosis between a thermodynamic database and a DTA curve

• Type: Article in International Scientific Journal
• Date: 1999

Authors

M. H. Braga (Author) FEUP; L. F. Malheiros (Author) FEUP; J. M. V. Machado (Author) FEUP; O. M. Freitas (Author) Other

Journal

Title: Journal of Materials Processing Technology

Vol. 92-93

Pages: 31-34

ISSN: 0924-0136

Publisher: Elsevier

Indexing

ISI Web of Knowledge - 2 Citations

ISI Web of Science

Scopus - 3 Citations

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Other information

Authenticus ID: P-001-3KD

DOI: 10.1016/S0924-0136(99)00217-4

Abstract (EN): The shape of a differential thermal analysis (DTA) curve depends on the sample and the reference, the heating or cooling rates used in the experiment as also the thermal resistance to heat ¯ow from the heat source to the cell containing the sample (or the reference), Ra (Rr). Having access to a database that contains the values of the sample heat capacity, Cp, and those of the enthalpy of transformation, H, and calculating the parameters that depend on the apparatus, the cells and the reference, as well as the heating rate used, it is possible to determine the
T (Ta ÿ Tr) values through the equation Ta ÿ Tr ˆ Ra dH dt ‡ RrCr dTr dt ÿ RaCa dTa dt where Ca is the heat capacity of the cell ‡ sample system and Cb the heat capacity of the cell ‡ reference system. The comparison between the calculated and experimental values for
T enables an assessment to be made as to whether the modelled parameters are in agreement with the experimental information. This procedure enables a deeper perception of the thermal analysis in general and of the apparatus used in particular.

Language: English

Type (Professor's evaluation): Scientific

No. of pages: 3