Exploring Jupiter's icy moons with old techniques and big facilities-new insights on sulfuric acid hydrates

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dc.contributor.authorMaynard-Casely, HEen_AU
dc.contributor.authorAvdeev, Men_AU
dc.contributor.authorBrand, HEAen_AU
dc.contributor.authorWallwork, KSen_AU
dc.date.accessioned2021-07-27T02:50:33Zen_AU
dc.date.available2021-07-27T02:50:33Zen_AU
dc.date.issued2013-12-13en_AU
dc.date.statistics2021-07-26en_AU
dc.description.abstractSulfuric acid hydrates have been proposed to be abundant on the surface of Europa [1], and hence would be important planetary forming materials for this moon and its companions Ganymede and Callisto. Understanding of the surface features and subsurface of these moons could be advanced by firmer knowledge of the icy materials that comprise them [2], insight into which can be drawn from firmer knowledge of physical properties and phase behaviour of the candidate materials. We wish to present results from a study that started with the question ';What form of sulfuric acid hydrate would form on the surface of Europa'. The intrinsic hydrogen-domination of planetary ices, makes studying these materials with laboratory powder diffraction very challenging. Insights into their crystalline phase behavior and the extraction of a number of thermal and mechanical properties is often only accessible with high-flux synchrotron x-ray diffraction and utilization of the large scattering cross section with neutron diffraction. We have used the Powder Diffraction beamline at Australian synchrotron [4] and the Echidna (High-resolution neutron powder diffraction) instrument of the Australian Nuclear Science and Technology Organization, [5] to obtain an number of new insights into the crystalline phases formed from sulfruic acid and water mixtures. These instruments have enabled the discovery a new water-rich sulfuric acid hydrate form [6], improved structural characterisation of existing forms [7] and a charting the phase diagram of this fundamental binary system [8]. This has revealed exciting potential for understanding more about the surface of Europa from space, perhaps even providing a window into its past.[1] Carlson, R.W., R.E. Johnson, and M.S. Anderson, Science, 1999. 286(5437): p. 97-99. [2] Fortes, A.D. and M. Choukroun. Space Sci Rev, 2010. 153(1-4): p. 185-218. [3] Blake, D., et al., Space Sci Rev,, 2012. 170(1-4): p. 341-399. [4] Wallwork, K.S., Kennedy B. J. and Wang, D., AIP Conf Proc, 2007. 879: p. 879-882. [5] Liss, K.D., et al., Phys B-Cond Mat, 2006. 385-86: p. 1010-1012. [6] Maynard-Casely, H.E., K.S. Wallwork, and M. Avdeev, (In review). [7] Maynard-Casely, H.E., H.E.A. Brand, and K.S. Wallwork, J.of App.Cryst, 2012. 45: p.1198-1207. [8] Maynard-Casely, H.E., K.S. Wallwork, and H.E.A. Brand, (In Preparation). Stages of the crystal structure determination of sulfruic acid octahydrate a) the oxygen and sulfur postions were determined from the synchrotron x-ray data b) Once neutron diffraction data was collected Fourier difference methods were used to locate hydrogen positions to determine c) the full structure of sulfuric acid octahydrate.en_AU
dc.identifier.citationMaynard-Casely, H. E., Avdeev, M., Brand, H., & Wallwork, K. (2013). Exploring Jupiter's icy moons with old techniques and big facilities-new insights on sulfuric acid hydrates. Paper presented at American Geophysical Union, Fall Meeting San Francisco, California, 9-13 December.en_AU
dc.identifier.conferenceenddate13 December 2013en_AU
dc.identifier.conferencenameAmerican Geophysical Union, Fall Meetingen_AU
dc.identifier.conferenceplaceSan Francisco, Californiaen_AU
dc.identifier.conferencestartdate9 December 2013en_AU
dc.identifier.urihttps://apo.ansto.gov.au/dspace/handle/10238/11100en_AU
dc.language.isoenen_AU
dc.publisherAmerican Geophysical Unionen_AU
dc.subjectX-ray diffractionen_AU
dc.subjectNeutron diffractionen_AU
dc.subjectElectron spectroscopyen_AU
dc.subjectPlanetsen_AU
dc.subjectSolar systemen_AU
dc.subjectIceen_AU
dc.subjectCoherent scatteringen_AU
dc.subjectElectromagnetic radiationen_AU
dc.subjectOxygen compoundsen_AU
dc.subjectSulfur compoundsen_AU
dc.subjectANSTOen_AU
dc.titleExploring Jupiter's icy moons with old techniques and big facilities-new insights on sulfuric acid hydratesen_AU
dc.typeConference Abstracten_AU
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