In situ synchrotron diffraction studies on the formation kinetics of jarosites

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dc.contributor.authorScarlett, NVYen_AU
dc.contributor.authorGrey, IEen_AU
dc.contributor.authorBrand, HEAen_AU
dc.date.accessioned2014-06-25T23:43:10Zen_AU
dc.date.available2014-06-25T23:43:10Zen_AU
dc.date.issued2013-03-01en_AU
dc.date.statistics2014-06-26en_AU
dc.description.abstractThis paper reports the results of time-resolved synchrotron powder diffraction experiments where jarosites with different K/H3O, K/Na and Na/H3O ratios were synthesized in situ at temperatures of 353, 368 and 393 K in order to observe the effect on kinetics and species produced. The Na/H3O sample formed monoclinic jarosite at all three temperatures, whereas the K/H3O and K/Na samples formed as rhombohedral jarosites at 353 K, and as mixtures of rhombohedral and monoclinic jarosites at the higher temperatures. The relative amount of the monoclinic phase increased with increase in temperature. Unit-cell parameter changes with reaction time could be explained by changes in iron stoichiometry (samples become more stoichiometric with time) together with changes in K/H3O and Na/H3O ratios. The reaction kinetics have been fitted using a two-stage Avrami model, with two different Avrami exponents corresponding to initial two-dimensional growth followed by one-dimensional diffusion-controlled growth. Activation energies for the initial growth stage were calculated to be in the range 90-126 kJ mol(-1). © 2013, Wiley-Blackwell.en_AU
dc.identifier.citationScarlett, N. V. Y., Grey, I. E., & Brand, H. E. A. (2013). In situ synchrotron diffraction studies on the formation kinetics of jarosites. Journal of Synchrotron Radiation, 20(part 2), 366-375. doi:10.1107/s0909049513000101en_AU
dc.identifier.govdoc5140en_AU
dc.identifier.issn0909-0495en_AU
dc.identifier.issuePart 2en_AU
dc.identifier.journaltitleJournal of Synchrotron Radiationen_AU
dc.identifier.pagination366-375en_AU
dc.identifier.urihttp://dx.doi.org/10.1107/s0909049513000101en_AU
dc.identifier.urihttp://apo.ansto.gov.au/dspace/handle/10238/5716en_AU
dc.identifier.volume20en_AU
dc.language.isoenen_AU
dc.publisherWiley Blackwellen_AU
dc.subjectPrecipitationen_AU
dc.subjectX-ray diffractionen_AU
dc.subjectX-ray lasersen_AU
dc.subjectDiffractionen_AU
dc.subjectSynchrotronsen_AU
dc.subjectCrystalsen_AU
dc.titleIn situ synchrotron diffraction studies on the formation kinetics of jarositesen_AU
dc.typeJournal Articleen_AU
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