Zinc hydroxide sulphate and its transformation to crystalline zinc oxide?

Dalton Transactions Pub Date: 2013-08-21 DOI: 10.1039/C3DT51638E

Abstract

The thermal transformation of zinc hydroxide sulphate hydrate to zinc oxide has been examined using synchrotron X-ray diffraction, thermogravimetric analysis, scanning electron microscopy, and surface area measurements. By collecting X-ray diffraction data in situ, we found that the dehydration of zinc hydroxide sulphate pentahydrate proceeded in discrete steps to form anhydrous zinc hydroxide sulphate. This compound then decomposed to a mixture of zinc oxide and a compound tentatively identified as Zn3(OH)2(SO4)2 at ～235 °C. At ～360 °C, the final dehydroxylation occurred with the formation of zinc oxy-sulphate, Zn3O(SO4)2, which then decomposed to ZnO at about ～800 °C. Interruption of the dehydration process can be used to synthesize the intermediate compounds.

Graphical abstract: Zinc hydroxide sulphate and its transformation to crystalline zinc oxide
Recommended Literature