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Sodium percarbonate between 293 and 100 K by Robin Gavin Pritchard; Emran Islam is a Chemistry article available to read on EtoBox.

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Sodium carbonate perhydrate, Na~2~CO~3~·1.5H~2~O~2~, commonly known as sodium percarbonate, has been structurally characterized at temperatures ranging from 293 down to 100 K. As the temperature drops, there is a reversible phase change between 250 and 240 K, in which the crystallographic mirror plane of the room-temperature space group, __Cmca__, is lost, transforming it to __Pbca__. This transformation is accompanied by a reversal in the expansion coefficient of cell side __b__, which, like the other two sides, initially contracts on cooling. The two crystallographically independent hydrogen peroxide sites undergo the largest change, where the disorder seen at room temperature gradually diminishes and is almost completely absent at 100 K, thus indicating dynamic rather than static disorder. It is noteworthy that, despite __Cmca__ being the preferred room-temperature space group in the current work, two previous single-crystal studies rejected this space group in favour of non-centrosymmetric __Aba__2 [Carrondo __et al.__ (1977). __J. Chem. Soc. Dalton Trans.__ pp. 2323–2331; Adams & Pritchard (1977). __Acta Cryst__. B**33**, 3650–3653]. A re-evaluation of these determinations ind

Who reads Sodium percarbonate between 293 and 100 K?

Author

Robin Gavin Pritchard; Emran Islam

Publisher

International Union of Crystallography; Blackwell Publishing Inc.; International Union of Crystallography (IUCr) (ISSN 0108-7681)

Published

2003

Language

EN

Field

Chemistry (Physical Sciences)