Agrawal, Y. K. ; Shashimohan, A. L. ; Biswas, A. B. (1975) Studies on antimony oxides: Part I. Thermal analysis of Sb2O3 in air, nitrogen and argon Journal of Thermal Analysis and Calorimetry, 7 (3). pp. 635-641. ISSN 1388-6150
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Official URL: http://www.springerlink.com/content/k286j72q674831...
Related URL: http://dx.doi.org/10.1007/BF01912023
Abstract
Thermogravimetry (TG), differential thermal analysis (DTA) and X-ray diffraction studies of antimony(III) oxide, (Sb2O3), in air, nitrogen and argon atmospheres have been made. In air Sb2O3 becomes oxidized to Sb2O4 above 510°. The oxidation reaction proceeds in two stages as revealed by the TG and DTA curves. The behaviour of Sb2O3 is similar in both N2 and Ar. Sb2O3 remains unaffected up to 430°, above which there is a slow, and continuous mass loss up to 550°. Above 550°Sb2O3 volatilizes resulting in an enormous weight loss. X-ray studies of the sublimate and the residue indicate the former to be the cubic form of Sb2O3 (Senarmontite) while the residue is the orthorhombic (Valentinite) structure. From the DTA curves in air, N2 and Ar, the transition temperature for the cubic to the orthorhombic modification has been estimated to be around 610°.
Item Type: | Article |
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ID Code: | 81101 |
Deposited On: | 04 Feb 2012 07:43 |
Last Modified: | 04 Feb 2012 07:43 |
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