Ilustration of the influence of the heating rate in thermogravimetry results.
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Undergraduate course
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Soc Brasileira Quimica
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Abstract
The effects of the heating rate on a TG curve of a sample have been widely discussed in the literature. This paper shows the influence of heating rate (beta) in thermogravimetry results when stoichiometry determinations are studied. For this purpose the compound Sm(CH3SO3)(3). 2(3-picNO) was considered beta of 2,5; 5; 10; 20 and 40 degrees C min(-1) in dynamic air atmosphere were obtained. The results are in agreement with proposed stoichiometry for beta equal to 2,5 and 5 degrees C min(-1). However, using a higher beta the same results were not obtained resulting in false stoichiometry determinations.
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Keywords
heating rate, thermogravimetry, stoichiometry determination
Language
Portuguese
Citation
Quimica Nova. Sao Paulo: Soc Brasileira Quimica, v. 23, n. 1, p. 113-115, 2000.
