Ilustração da influência da razão de aquecimento nos resultados De termogravimetria

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 (β) in thermogravimetry results when stoichtometry determinations are studied. For this purpose the compound Sm(CH3SO3)3.2(3-picNO) was considered β of 2,5; 5; 10; 20 and 40°C min-1 in dynamic air atmosphere were obtained. The results are in agreement with proposed stoichiometry for β equal to 2,5 and 5°C min-1. However, using a higher β the same results were not obtained resulting in false stoichiometry determinations.