title: Zinc hydroxide sulphate and its transformation to crystalline zinc oxide.
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.
authors: Avocado Engineering, 6/5 Lusty Street Wolli Creek, NSW 2205, Australia. a.moezzi@avocadoengineering.com.
authors: Amir
authors: A
authors: Moezzi
authors: Michael B
authors: MB
authors: Cortie
authors: Andrew M
authors: AM
authors: McDonagh