Kinetics and mechanism of the transformation in antimony trioxide from orthorhombic valentinite to cubic senarmontite
Data(s) |
01/09/1975
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Resumo |
The kinetics of the polymorphic transformation in antimony trioxide from metastable orthorhombic valentinite to cubic senarmontite has been studied in polycrystalline material between 490 and 530°C. Quantitative analysis of the mixtures was done using infrared spectrophotometry. The kinetic data was analyzed and the activation energy for the process was obtained: (i) On the basis of Avrami's equation, which is derived on the basis of a nucleation and growth mechanism; and (ii) from the time required for a constant fraction of the transformation to take place. The values obtained were 50.8 and 46.0 kcal/mole. Observations have also been made on partly transformed single crystals of valentinite using a polarizing microscope. The latter studies and the value of the activation energy suggest that a better understanding of the transformation could be obtained on the basis of a vapor phase mechanism. |
Formato |
application/pdf |
Identificador |
Gopalakrishnan, PS and Manohar, H (1975) Kinetics and mechanism of the transformation in antimony trioxide from orthorhombic valentinite to cubic senarmontite. In: Journal of Solid State Chemistry, 15 (1). pp. 61-67. |
Publicador |
Elsevier Science |
Relação |
http://www.sciencedirect.com/science?_ob=ArticleURL&_udi=B6WM2-4JMHGXF-8&_user=512776&_rdoc=1&_fmt=&_orig=search&_sort=d&_docanchor=&view=c&_acct=C000025298&_version=1&_urlVersion=0&_userid=512776&md5=5849f241cb6417faa39f4ae8ff826a62 http://eprints.iisc.ernet.in/23923/ |
Palavras-Chave | #Inorganic & Physical Chemistry |
Tipo |
Journal Article PeerReviewed |