Zinc hydroxide sulphate and its transformation to crystalline zinc oxide

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Journal Article
Dalton Transactions, 2013, 42 (40), pp. 14432 - 14437
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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. © 2013 The Royal Society of Chemistry.
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