TITLE

Studies on thermal decomposition and oxidation of CoSb

AUTHOR(S)
Leszczynski, Juliusz; Wojciechowski, Krzysztof; Malecki, Andrzej
PUB. DATE
July 2011
SOURCE
Journal of Thermal Analysis & Calorimetry;Jul2011, Vol. 105 Issue 1, p211
SOURCE TYPE
Academic Journal
DOC. TYPE
Article
ABSTRACT
Thermal durability of CoSb in vacuum, helium and air was investigated over the temperature range of 20-850 °C. A scanning electron microscope (SEM) and X-ray powder diffraction technique were used to investigate the microstructure and to carry out the phase analysis of the degradation products. The analysis of a non-isothermal and isothermal decomposition and oxidation of the CoSb powders and polycrystalline samples were performed using simultaneous TG/DTA technique. More detailed studies were carried out on the oxidation in the temperature range 400-600 °C. It was established that the decomposition products are CoSb and a volatile antimony. In case of oxidation a complex three-layered scale is formed, consisting of CoSbO, CoSbO and SbO layers. Both the decomposition and the oxidation kinetics are determined by a diffusion through the growing layers of products. The electrical resistivity and Seebeck coefficient measurements have been also performed on pure and oxidized samples, which showed a large influence of the oxidation on the electrical properties.
ACCESSION #
61351793

 

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